我没有绑定错误,此代码在另一个地方工作。我还没有发现我现在做的与它工作的代码有什么不同,而且代码不是那么多。
在 UserControl.Resource:
中<Style TargetType="TextBox">
<Setter Property="BorderBrush" Value="DarkBlue"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Margin" Value="0,1,0,1"/>
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<StackPanel Orientation="Horizontal">
<AdornedElementPlaceholder/>
<Grid Margin="2,0,0,0">
<Ellipse Width="20" Height="20" Fill="Red"/>
<TextBlock Foreground="White" Text="X" FontWeight="Bold"
HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="ToolTip"
Value="{Binding RelativeSource={RelativeSource Self},
Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
</Style>
下面也是Xaml:
<TextBlock Height="23" HorizontalAlignment="Left" Margin="22,90,0,0"
Text="Keywords" VerticalAlignment="Top"/>
<TextBox Height="23" HorizontalAlignment="Left" Margin="22,108,0,0"
VerticalAlignment="Top" Width="244">
<Binding Path="Tags" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<DataErrorValidationRule ValidatesOnTargetUpdated="False"/>
</Binding.ValidationRules>
</Binding>
</TextBox>
我的ViewModel中的按钮SAVE仅在Model.Tags
属性从用户输入10个字符时激活。当我输入10,11然后返回8个字符时,按钮激活/禁用工作正常。所有属性更改都会被触发。
模型:
namespace TBM.Model
{
public class Document : EntityBase , IDataErrorInfo
{
public int Id { get; set; }
public string DocumentName { get; set; }
public string Tags { get; set; }
public byte[] DocumentData { get; set; }
public int PeriodId { get; set; }
string IDataErrorInfo.Error { get { return null; } }
string IDataErrorInfo.this[string propertyName]
{
get { return this.GetValidationError(propertyName); }
}
public bool IsValid
{
get
{
foreach (string property in ValidatedProperties)
if (GetValidationError(property) != null)
return false;
return true;
}
}
static readonly string[] ValidatedProperties = { "Tags", };
private string GetValidationError(string propertyName)
{
if (Array.IndexOf(ValidatedProperties, propertyName) < 0)
return null;
string error = null;
switch (propertyName)
{
case "Tags": error = this.IsTagsEmpty(Tags); break;
default:
Debug.Fail("Unexpected property being validated on Document: " + propertyName);
break;
}
return error;
}
private string IsTagsEmpty(string value)
{
if (value != null && value.Trim().Length >= 10)
return null;
else
return "The keywords must have at least 10 chars!";
}
}
}
视图模型:
public RelayCommand SaveDocumentCommand
{
get { return _saveDocumentCommand ?? (_saveDocumentCommand =
new RelayCommand(() => SaveDocument(),() => CanSaveDocument())); }
}
private bool CanSaveDocument()
{
return _document.IsValid;
}
//...
什么不起作用是没有显示红色Ellipse的ErrorTemplate?
更新:以下代码在TEST项目中正常工作。但在我的生产项目中它没有找到资源???为什么这样呢?
<TextBlock Height="23" HorizontalAlignment="Left" Margin="22,89,0,0"
Text="Keywords" VerticalAlignment="Top"/>
<TextBox Style="{StaticResource bla}" Height="23" HorizontalAlignment="Left"
Margin="22,109,0,0" VerticalAlignment="Top" Width="244">
<Binding Path="Tags" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<DataErrorValidationRule ValidatesOnTargetUpdated="False"
ValidationStep="UpdatedValue"/>
</Binding.ValidationRules>
</Binding>
</TextBox>
<UserControl.Resources>
<Style x:Name="bla" TargetType="TextBox">
<Setter Property="BorderBrush" Value="DarkBlue"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Margin" Value="0,1,0,1"/>
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<StackPanel Orientation="Horizontal">
<AdornedElementPlaceholder/>
<Grid Margin="2,0,0,0">
<Ellipse Width="20" Height="20" Fill="Red"/>
<TextBlock Foreground="White" Text="X" FontWeight="Bold"
HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="ToolTip"
Value="{Binding RelativeSource={RelativeSource Self},
Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
答案 0 :(得分:10)
我有类似的问题。为了意识到装饰层出了问题,打了好几个小时。
我所做的就是将控件放在里面。就是这样。由于某种原因,这个装饰层有时会消失。对于TabControl来说肯定是这样(但在我的情况下,这是另一个原因)。
所以看起来应该是这样的
<AdornerDecorator>
<Grid>
<TextBox .../>
</Grid>
</AdornerDecorator>
希望这有帮助!
答案 1 :(得分:0)
我遇到了类似的问题,结果证明不是模板,但验证没有返回我的预期。
答案 2 :(得分:0)
ViewModel必须实现IDataErrorInfo,而不是Model。 ViewModel将您的View绑定为DataContext,而不是Model,因此在ViewModel中实现接口并绑定到XAML中的相应属性。