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annotate Chronosv2/source/Presentation/ViewModel/EntityViewModel.cs @ 10:443821e55f06

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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1 /*
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2 The MIT License
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3
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4 Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/
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5
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6 Permission is hereby granted, free of charge, to any person obtaining a copy
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7 of this software and associated documentation files (the "Software"), to deal
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8 in the Software without restriction, including without limitation the rights
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9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 copies of the Software, and to permit persons to whom the Software is
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11 furnished to do so, subject to the following conditions:
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12
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13 The above copyright notice and this permission notice shall be included in
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14 all copies or substantial portions of the Software.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 THE SOFTWARE.
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23 */
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24
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25 using System;
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26 using System.ComponentModel;
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27 using Chronos.Presentation.Core.ViewModel;
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28
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29 namespace Chronos.Presentation.ViewModel
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30 {
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31 /// <summary>
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32 /// Base class for entity viewmodel implementations
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33 /// </summary>
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34 /// <typeparam name="TEntity"></typeparam>
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35 public abstract class EntityViewModel<TEntity>
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36 : ViewModelBase, IEntityViewModel<TEntity> where TEntity : class, IDataErrorInfo, new()
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37 {
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38 #region · Fields ·
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39
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40 private TEntity entity;
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41
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42 #endregion
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43
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44 #region · IEntityViewModel<TEntity> Properties ·
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45
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46 /// <summary>
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47 /// Gets the entity model instance
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48 /// </summary>
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49 public TEntity Entity
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50 {
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51 get { return this.entity; }
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52 }
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53
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54 /// <summary>
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55 /// Gets value indicating whether this instance is valid
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56 /// </summary>
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57 public virtual bool IsValid
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58 {
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59 get { return String.IsNullOrEmpty(this.Error); }
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60 }
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61
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62 /// <summary>
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63 /// Gets value indicating whether this instance has changes
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64 /// </summary>
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65 public virtual bool HasChanges
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66 {
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67 get { return false; }
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68 }
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69
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70 /// <summary>
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71 /// Gets an error message indicating what is wrong with this object.
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72 /// </summary>
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73 /// <value>
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74 /// An error message indicating what is wrong with this object. The default is
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75 /// an empty string ("").
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76 /// </value>
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77 public virtual string Error
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78 {
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79 get
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80 {
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81 if (this.Entity != null)
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82 {
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83 return this.Entity.Error;
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84 }
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85
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86 return null;
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87 }
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88 }
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89
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90 /// <summary>
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91 /// Gets the error message for the property with the given name.
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92 /// </summary>
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93 /// <param name="columnName">The name of the property whose error message to get.</param>
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94 /// <value>The error message for the property. The default is an empty string ("").</value>
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95 public virtual string this[string columnName]
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96 {
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97 get
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98 {
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99 if (this.Entity != null)
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100 {
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101 return this.Entity[columnName];
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102 }
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103
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104 return null;
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105 }
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106 }
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107
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108 #endregion
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109
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110 #region · Constructors ·
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111
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112 /// <summary>
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113 /// Initializes a new instance of the <see cref="EntityViewModel"/> class
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114 /// </summary>
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115 protected EntityViewModel()
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116 : base()
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117 {
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118 this.entity = new TEntity();
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119 }
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120
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121 /// <summary>
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122 /// Initializes a new instance of the <see cref="EntityViewModel"/> class
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123 /// with the given entity model
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124 /// </summary>
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125 /// <param name="entity"></param>
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126 protected EntityViewModel(TEntity entity)
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127 : this()
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128 {
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129 this.entity = entity;
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130 }
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131
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132 #endregion
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133 }
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134 }
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135