[C#/SILVERLIGHT] Binding 태그 확장 : INotifyDataErrorInfo 인터페이스를 이용한 바인딩 에러 처리하기
C#/Silverlight 2014. 2. 26. 02:56728x90
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▶ Product.cs
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
/// <summary>
/// 제품
/// </summary>
public class Product : INotifyDataErrorInfo
{
//////////////////////////////////////////////////////////////////////////////////////////////////// Event
////////////////////////////////////////////////////////////////////////////////////////// Public
// INotifyDataErrorInfo
#region 에러 변경시 - ErrorsChanged
/// <summary>
/// 에러 변경시
/// </summary>
public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;
#endregion
//////////////////////////////////////////////////////////////////////////////////////////////////// Field
////////////////////////////////////////////////////////////////////////////////////////// Private
#region Field
/// <summary>
/// 에러 사전
/// </summary>
private Dictionary<string, List<string>> errorDictionary = new Dictionary<string, List<string>>();
/// <summary>
/// ID 에러 메시지
/// </summary>
private const string ERROR_MESSAGE = "Value cannot be less than 5.";
/// <summary>
/// ID 경고 메시지
/// </summary>
private const string ID_WARNING_MESSAGE = "Value should not be less than 10.";
/// <summary>
/// 명칭 에러 메시지
/// </summary>
private const string NAME_ERROR_MESSAGE = "Value must not contain any spaces.";
/// <summary>
/// 명칭 경고 메시지
/// </summary>
private const string NAME_WARNING_MESSAGE = "Value should be 5 characters or less.";
/// <summary>
/// ID
/// </summary>
private int id;
/// <summary>
/// 명칭
/// </summary>
private string name;
#endregion
//////////////////////////////////////////////////////////////////////////////////////////////////// Property
////////////////////////////////////////////////////////////////////////////////////////// Public
// INotifyDataErrorInfo
#region 에러 여부 - HasErrors
/// <summary>
/// 에러 여부
/// </summary>
public bool HasErrors
{
get
{
return this.errorDictionary.Count > 0;
}
}
#endregion
#region ID - ID
/// <summary>
/// ID
/// </summary>
public int ID
{
get
{
return this.id;
}
set
{
if(IsIDValid(value) && this.id != value)
{
this.id = value;
}
}
}
#endregion
#region 명칭 - Name
/// <summary>
/// 명칭
/// </summary>
public string Name
{
get
{
return this.name;
}
set
{
if(IsNameValid(value) && this.name != value)
{
this.name = value;
}
}
}
#endregion
//////////////////////////////////////////////////////////////////////////////////////////////////// Method
////////////////////////////////////////////////////////////////////////////////////////// Public
#region ID 무결성 여부 조사하기 - IsIDValid(id)
/// <summary>
/// ID 무결성 여부 조사하기
/// </summary>
/// <param name="id">ID</param>
/// <returns>ID 무결성 여부</returns>
public bool IsIDValid(int id)
{
bool isValid = true;
if(id < 5)
{
AddError("ID", ID_ERROR_MESSAGE, false);
isValid = false;
}
else
{
RemoveError("ID", ID_ERROR_MESSAGE);
}
if(id< 10)
{
AddError("ID", ID_WARNING_MESSAGE, true);
}
else
{
RemoveError("ID", ID_WARNING_MESSAGE);
}
return isValid;
}
#endregion
#region 명칭 무결성 여부 조사하기 - IsNameValid(name)
/// <summary>
/// 명칭 무결성 여부 조사하기
/// </summary>
/// <param name="name">명칭</param>
/// <returns>명칭 무결성 여부</returns>
public bool IsNameValid(string name)
{
bool isValid = true;
if(name.Contains(" "))
{
AddError("Name", NAME_ERROR_MESSAGE, false);
isValid = false;
}
else
{
RemoveError("Name", NAME_ERROR_MESSAGE);
}
if(name.Length > 5)
{
AddError("Name", NAME_WARNING_MESSAGE, true);
}
else
{
RemoveError("Name", NAME_WARNING_MESSAGE);
}
return isValid;
}
#endregion
#region 에러 추가하기 - AddError(propertyName, message, isWarning)
/// <summary>
/// 에러 추가하기
/// </summary>
/// <param name="propertyName">속성명</param>
/// <param name="message">메시지</param>
/// <param name="isWarning">경고 여부</param>
public void AddError(string propertyName, string message, bool isWarning)
{
if(!this.errorDictionary.ContainsKey(propertyName))
{
this.errorDictionary[propertyName] = new List<string>();
}
if(!this.errorDictionary[propertyName].Contains(message))
{
if(isWarning)
{
this.errorDictionary[propertyName].Add(message);
}
else
{
this.errorDictionary[propertyName].Insert(0, message);
}
RaiseErrorsChanged(propertyName);
}
}
#endregion
#region 에러 제거하기 - RemoveError(propertyName, message)
/// <summary>
/// 에러 제거하기
/// </summary>
/// <param name="propertyName">속성명</param>
/// <param name="message">메시지</param>
public void RemoveError(string propertyName, string message)
{
if(this.errorDictionary.ContainsKey(propertyName) && this.errorDictionary[propertyName].Contains(message))
{
this.errorDictionary[propertyName].Remove(message);
if(this.errorDictionary[propertyName].Count == 0)
{
this.errorDictionary.Remove(propertyName);
}
RaiseErrorsChanged(propertyName);
}
}
#endregion
#region ErrorsChanged 이벤트 발생시키기 - RaiseErrorsChanged(propertyName)
/// <summary>
/// ErrorsChanged 이벤트 발생시키기
/// </summary>
/// <param name="propertyName">속성명</param>
public void RaiseErrorsChanged(string propertyName)
{
if(ErrorsChanged != null)
{
ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
}
}
#endregion
// INotifyDataErrorInfo
#region 에러 조사하기 - GetErrors(propertyName)
/// <summary>
/// 에러 조사하기
/// </summary>
/// <param name="propertyName">속성명</param>
/// <returns>에러 리스트</returns>
public IEnumerable GetErrors(string propertyName)
{
if(string.IsNullOrEmpty(propertyName) || !this.errorDictionary.ContainsKey(propertyName))
{
return null;
}
return this.errorDictionary[propertyName];
}
#endregion
}
728x90
▶ MainPage.xaml.cs
using System.Windows.Controls;
using System.Windows.Input;
...
#region 생성자 - MainPage()
/// <summary>
/// 생성자
/// </summary>
public MainPage()
{
InitializeComponent();
this.grid.DataContext = new Product() { ID = 10, Name = "food" };
}
#endregion
...
#region 텍스트 박스 키 다운시 처리하기 - TextBox_KeyDown(sender, e)
/// <summary>
/// 텍스트 박스 키 다운시 처리하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
{
(sender as TextBox).GetBindingExpression(TextBox.TextProperty).UpdateSource();
}
}
#endregion
300x250
▶ MainPage.xaml
<Grid x:Name="grid"
xmlns:input="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"
Margin="10"
Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="200" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="1"
Margin="3"
FontWeight="Bold"
Text="Product" />
<input:Label Grid.Row="1" Grid.Column="0"
HorizontalAlignment="Right"
Margin="3"
Target="{Binding ElementName=idTextBox}" />
<TextBox x:Name="idTextBox" Grid.Row="1" Grid.Column="1"
Margin="3"
MaxLength="5"
Text="{Binding ID, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}"
KeyDown="TextBox_KeyDown" />
<input:DescriptionViewer Grid.Row="1" Grid.Column="2"
Description="ID must be greater than 4 and should be greater than 9." />
<input:Label Grid.Row="2" Grid.Column="0"
HorizontalAlignment="Right"
Margin="3"
Target="{Binding ElementName=nameTextBox}" />
<TextBox x:Name="nameTextBox" Grid.Row="2" Grid.Column="1"
Margin="3"
MaxLength="10"
Text="{Binding Name, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}"
KeyDown="TextBox_KeyDown" />
<input:DescriptionViewer Grid.Row="2" Grid.Column="2"
Description="Name must not contain spaces and should be 5 characters or less." />
<input:ValidationSummary Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2"
Margin="3" />
</Grid>
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