Mercurial > silverbladetech

annotate Chronosv2/source/Presentation/ViewModel/WindowViewModel.cs @ 19:09d18d6e5f40

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airport work
author stevenh7776 stevenhollidge@hotmail.com
date Thu, 15 Mar 2012 06:59:15 +0000
parents 443821e55f06
children
rev   line source
19
09d18d6e5f40 airport work
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1 using System;
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2 using System.ComponentModel;
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3 using System.Threading;
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4 using System.Threading.Tasks;
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5 using Chronos.Presentation.Core.ViewModel;
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6 using Chronos.Presentation.Core.Windows;
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7 using NLog;
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8 using nRoute.Components;
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9
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10 namespace Chronos.Presentation.ViewModel
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11 {
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12 public abstract class WindowViewModel<TEntity>
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13 : NavigationViewModel, IWindowViewModel where TEntity: class, new()
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14 {
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15 #region · Logger ·
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16
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17 private static Logger Logger = LogManager.GetCurrentClassLogger();
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18
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19 #endregion
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20
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21 #region · Inner Types ·
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22
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23 [Serializable]
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24 protected enum InquiryActionResultType
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25 {
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26 DataFetched,
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27 RequestedNew,
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28 DataNotFound
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29 }
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30
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31 protected sealed class InquiryActionResult<TResult>
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32 where TResult : class
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33 {
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34 #region · Properties ·
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35
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36 public TResult Data
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37 {
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38 get;
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39 set;
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40 }
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41
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42 public InquiryActionResultType Result
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43 {
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44 get;
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45 set;
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46 }
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47
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48 #endregion
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49
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50 #region · Constructors ·
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51
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52 public InquiryActionResult()
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53 {
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54 }
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55
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56 #endregion
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57 }
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58
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59 #endregion
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60
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61 #region · PropertyChangedEventArgs Cached Instances ·
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62
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63 private static readonly PropertyChangedEventArgs ViewModeChangedArgs = CreateArgs<WindowViewModel<TEntity>>(x => x.ViewMode);
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64 private static readonly PropertyChangedEventArgs StatusMessageChangedArgs = CreateArgs<WindowViewModel<TEntity>>(x => x.StatusMessage);
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65 private static readonly PropertyChangedEventArgs NotificationMessageChangedArgs = CreateArgs<WindowViewModel<TEntity>>(x => x.NotificationMessage);
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66
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67 #endregion
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68
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69 #region · Events ·
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70
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71 /// <summary>
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72 /// Occurs when view mode is changed.
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73 /// </summary>
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74 public event EventHandler ViewModeChanged;
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75
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76 #endregion
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77
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78 #region · Fields ·
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79
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80 private TEntity originalEntity;
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81 private string statusMessage;
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82 private string notificationMessage;
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83 private TEntity entity;
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84 private ViewModeType viewMode;
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85 private PropertyStateCollection<TEntity> propertyStates;
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86
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87 #region · Commands ·
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88
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89 private ActionCommand inquiryCommand;
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90
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91 #endregion
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92
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93 #endregion
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94
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95 #region · Properties ·
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96
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97 /// <summary>
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98 /// Gets the property state collection
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99 /// </summary>
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100 public PropertyStateCollection<TEntity> PropertyStates
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101 {
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102 get
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103 {
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104 if (this.propertyStates == null)
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105 {
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106 this.propertyStates = new PropertyStateCollection<TEntity>();
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107 }
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108
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109 return this.propertyStates;
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110 }
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111 }
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112
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113 /// <summary>
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114 /// Gets or sets the state of the smart part.
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115 /// </summary>
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116 /// <value>The state of the smart part.</value>
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117 public ViewModeType ViewMode
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118 {
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119 get { return this.viewMode; }
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120 set
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121 {
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122 if (this.viewMode != value)
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123 {
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124 this.viewMode = value;
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125 try
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126 {
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127 this.OnViewModeChanged();
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128 }
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129 catch
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130 {
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131 #warning TODO: This is done to prevent DataGrid erroros when discarding changes on new records
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132 }
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133 }
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134 }
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135 }
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136
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137 /// <summary>
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138 /// Gets the inquiry data command
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139 /// </summary>
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140 public ActionCommand InquiryCommand
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141 {
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142 get
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143 {
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144 if (this.inquiryCommand == null)
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145 {
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146 this.inquiryCommand = new ActionCommand
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147 (
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148 () => OnInquiryData(),
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149 () => CanInquiryData()
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150 );
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151 }
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152
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153 return this.inquiryCommand;
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154 }
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155 }
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156
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157 /// <summary>
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158 /// Gets or sets the status message text
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159 /// </summary>
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160 public string StatusMessage
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161 {
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162 get { return this.statusMessage; }
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163 set
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164 {
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165 if (this.statusMessage != value)
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166 {
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167 this.statusMessage = value;
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168 this.NotifyPropertyChanged(StatusMessageChangedArgs);
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169 }
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170 }
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171 }
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172
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173 /// <summary>
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174 /// Gets or sets the notification message text
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175 /// </summary>
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176 public string NotificationMessage
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177 {
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178 get { return this.notificationMessage; }
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179 set
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180 {
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181 if (this.notificationMessage != value)
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182 {
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183 this.notificationMessage = value;
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184 this.NotifyPropertyChanged(NotificationMessageChangedArgs);
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185 }
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186 }
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187 }
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188
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189 #endregion
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190
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191 #region · Protected Properties ·
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192
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193 /// <summary>
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194 /// Gets or sets the data model.
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195 /// </summary>
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196 /// <value>The data model.</value>
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197 protected TEntity Entity
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198 {
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199 get { return this.entity; }
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200 private set
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201 {
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202 if (!Object.ReferenceEquals(this.entity, value))
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203 {
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204 this.entity = value;
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205 }
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206 }
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207 }
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208
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209 protected TEntity OriginalEntity
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210 {
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211 get { return this.originalEntity; }
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212 set { this.originalEntity = value; }
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213 }
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214
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215 #endregion
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216
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217 #region · Constructors ·
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218
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219 protected WindowViewModel()
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220 : base()
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221 {
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222 this.InitializePropertyStates();
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223
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224 this.Entity = new TEntity();
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225 this.ViewMode = ViewModeType.ViewOnly;
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226 }
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227
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228 #endregion
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229
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230 #region · Command Actions ·
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231
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232 #region · Inquiry ·
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233
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234 protected virtual bool CanInquiryData()
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235 {
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236 return (this.ViewMode == ViewModeType.ViewOnly);
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237 }
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238
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239 protected void OnInquiryData()
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240 {
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241 InquiryActionResult<TEntity> result = new InquiryActionResult<TEntity>
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242 {
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243 Result = InquiryActionResultType.DataNotFound
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244 };
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245
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246 this.ViewMode = ViewModeType.Busy;
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247 this.StatusMessage = "Obteniendo datos, espere por favor ...";
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248
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249 Task task = Task.Factory.StartNew
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250 (
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251 (o) =>
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252 {
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253 Logger.Debug("Obteniendo datos '{0}'", this.Entity.ToString());
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254
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255 this.OnInquiryAction(result);
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256 }, result
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257 );
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258
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259 task.ContinueWith
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260 (
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261 (t) =>
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262 {
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263 Logger.Debug("Error al obtener datos '{0}'", t.Exception.InnerException.ToString());
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264
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265 this.OnInquiryActionFailed();
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266
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267 Exception exception = null;
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268 this.OriginalEntity = null;
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269
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270 if (t.Exception.InnerException != null)
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271 {
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272 exception = t.Exception.InnerException;
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273 }
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274 else
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275 {
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276 exception = t.Exception;
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277 }
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278
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279 this.NotificationMessage = exception.Message;
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280 },
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281 CancellationToken.None,
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282 TaskContinuationOptions.OnlyOnFaulted | TaskContinuationOptions.AttachedToParent,
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283 TaskScheduler.FromCurrentSynchronizationContext()
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284 );
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285
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286 task.ContinueWith
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287 (
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288 _ =>
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289 {
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290 Logger.Debug("Datos obtenidos correctamente '{0}'", this.Entity.ToString());
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291
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292 this.StatusMessage = null;
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293 this.OnInquiryActionComplete(result);
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294 },
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295 CancellationToken.None,
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296 TaskContinuationOptions.OnlyOnRanToCompletion | TaskContinuationOptions.AttachedToParent,
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297 TaskScheduler.FromCurrentSynchronizationContext()
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298 );
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299 }
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300
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301 protected abstract void OnInquiryAction(InquiryActionResult<TEntity> result);
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302
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303 protected virtual void OnInquiryActionComplete(InquiryActionResult<TEntity> result)
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304 {
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305 switch (result.Result)
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306 {
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307 case InquiryActionResultType.DataNotFound:
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308 this.OriginalEntity = null;
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309
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310 this.ResetDataModel();
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311
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312 this.ViewMode = ViewModeType.ViewOnly;
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313 break;
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314
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315 case InquiryActionResultType.RequestedNew:
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316 throw new InvalidOperationException("Requested New is not valid on this type of ViewModel");
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317
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318 case InquiryActionResultType.DataFetched:
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319 this.ResetDataModel(result.Data);
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320
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321 this.OriginalEntity = this.entity;
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322 this.ViewMode = ViewModeType.ViewOnly;
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323 break;
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324 }
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325 }
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326
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327 protected virtual void OnInquiryActionFailed()
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328 {
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329 this.ViewMode = ViewModeType.ViewOnly;
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330 }
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331
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332 #endregion
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333
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334 #endregion
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335
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336 #region · Overriden Methods ·
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337
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338 /// <summary>
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339 /// Called when the related view is being closed.
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340 /// </summary>
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341 public override void Close()
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342 {
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343 Logger.Debug("Cerrar ventana '{0}'", this.GetType());
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344
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345 if (this.originalEntity != null)
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346 {
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347 this.originalEntity = null;
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348 }
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349 if (this.entity != null)
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350 {
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351 this.entity = null;
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352 }
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353 if (this.propertyStates != null)
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354 {
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355 this.propertyStates.Clear();
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356 this.propertyStates = null;
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357 }
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358
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359 this.inquiryCommand = null;
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360 this.statusMessage = null;
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361 this.notificationMessage = null;
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362
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363 base.Close();
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364 }
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365
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366 #endregion
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367
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368 #region · DataModel Reset Methods ·
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369
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370 protected void ResetDataModel()
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371 {
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372 Logger.Debug("Resetar model '{0}'", this.GetType());
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373 this.ResetDataModel(new TEntity());
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374 Logger.Debug("Model reseteado '{0}'", this.GetType());
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375 }
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376
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377 protected virtual void ResetDataModel(TEntity model)
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378 {
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379 this.OnResetingDataModel(this.Entity, model);
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380
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381 this.OriginalEntity = null;
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382 this.Entity = model;
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383
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384 this.OnResetedDataModel(model);
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385 }
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386
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387 protected virtual void OnResetingDataModel(TEntity oldModel, TEntity newModel)
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388 {
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389 }
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390
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391 protected virtual void OnResetedDataModel(TEntity newModel)
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392 {
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393 this.NotifyAllPropertiesChanged();
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394 }
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395
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396 #endregion
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397
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398 #region · Protected Methods ·
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399
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400 protected virtual void InitializePropertyStates()
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401 {
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402 }
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403
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404 protected virtual void OnViewModeChanged()
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405 {
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406 if (this.ViewModeChanged != null)
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407 {
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408 this.ViewModeChanged(this, new EventArgs());
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409 }
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410
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411 this.NotifyPropertyChanged(ViewModeChangedArgs);
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412 }
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413
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414 protected virtual void UpdateAllowedUserActions()
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415 {
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416 this.Invoke
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417 (
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418 () =>
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419 {
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420 this.InquiryCommand.RequeryCanExecute();
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421 }
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422 );
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423 }
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424
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425 protected override void NotifyPropertyChanged(PropertyChangedEventArgs args)
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426 {
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427 if (args != StatusMessageChangedArgs)
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428 {
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429 this.StatusMessage = null;
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430 }
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431 if (args != NotificationMessageChangedArgs)
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432 {
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433 this.NotificationMessage = null;
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434 }
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435
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436 this.UpdateAllowedUserActions();
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437 base.NotifyPropertyChanged(args);
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438 }
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439
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440 #endregion
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441 }
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442 }