我正在开发一个 IDataErrorInfo
,用于验证应用程序中的文本框。以下是我的代码:
验证的 .cs 类:
public class UserInformation : IDataErrorInfo
{
public string _name;
public string _surname;
public string Name
{
get { return _name; }
set { _name = value; }
}
public string Surname
{
get { return _surname; }
set { _surname = value; }
}
public override string ToString()
{
return Name + " " + Surname;
}
public string this[string columnName]
{
get
{
if (columnName == null) return string.Empty;
string result = string.Empty;
if (columnName.Equals("Name"))
{
if (string.IsNullOrEmpty(_name))
result = "Name cannot be empty.";
}
return result;
}
}
public string Error { get; private set; }
}
.xaml文件内容如下:
<TextBox Grid.Column="3" Grid.Row="0" Name="TextBoxName"
Style="{DynamicResource InnerTextBox}"
Validation.ErrorTemplate="{StaticResource ValidationErrorTemplate}">
<TextBox.Text>
<Binding Path="Name" Source="{StaticResource UserInformation}"
ValidatesOnDataErrors="True" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<ExceptionValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
还有 ErrorTemplate
:
<ControlTemplate x:Key="ValidationErrorTemplate">
<DockPanel >
<StackPanel Orientation="Horizontal" DockPanel.Dock="Top">
<Grid Width="20" Height="20">
<Ellipse Width="20" Height="20" Fill="Tomato" HorizontalAlignment="Center" VerticalAlignment="Center" />
<TextBlock Foreground="White" FontWeight="Heavy" FontSize="8" HorizontalAlignment="Center" VerticalAlignment="Center" TextAlignment="Center"
ToolTip="{Binding ElementName=ErrorAdorner, Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">X</TextBlock>
</Grid>
<TextBlock Foreground="Tomato" FontWeight="12" Margin="2,0,0,0" FontSize="20"
Text="{Binding ElementName=ErrorAdorner, Path=AdornedElement.(Validation.Errors)[0].ErrorContent}" />
</StackPanel>
<AdornedElementPlaceholder x:Name="ErrorAdorner" />
</DockPanel>
</ControlTemplate>
当我输入时,代码运行良好。但是当文本框加载时,验证也会发生。我只希望在失去焦点或更改文本时(例如此处发布的文本)才进行验证。
如何避免在第一次文本框加载时考虑验证错误?
注意:即使我将UpdateSourceTrigger
设置为LoseFocus,它仍然进行验证。