如何根据ValidationRule类禁用WPF按钮？ （下面的代码可以很好地突出显示TextBox）
<Button x:Uid="btnSave" Content="{lex:LocTextExtension Key=Save, Dict=Resources, Assembly=PreShow.Player}" Height="23" HorizontalAlignment="Center" Name="btnSave" VerticalAlignment="Top" Width="75" IsDefault="True">
XAML：
<Window.Resources>
<k:PlayerConfiguration x:Key="ods"/>
<ControlTemplate x:Key="validationTemplate">
<DockPanel>
<TextBlock Foreground="Red" FontSize="20">!</TextBlock>
<AdornedElementPlaceholder/>
</DockPanel>
</ControlTemplate>
<Style x:Key="textBoxInError" TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip"
Value="{Binding RelativeSource={x:Static RelativeSource.Self},
Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<TextBox Grid.Column="1" Height="23" HorizontalAlignment="Left" Name="textBox1" VerticalAlignment="Top" Width="277">
<TextBox.Text>
<Binding Path="UserName" Source="{StaticResource ods}" UpdateSourceTrigger="PropertyChanged" >
<Binding.ValidationRules>
<c:ConfigValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
C＃
public class ConfigValidationRule : ValidationRule
{
public ConfigValidationRule()
{
HasError = true;
}
public bool HasError { set; get; }
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
try
{
if (((string)value).Length > 0)
{
HasError = false;
return new ValidationResult(true, null);
}
else
{
HasError = true;
return new ValidationResult(false, "!");
}
}
catch
{
HasError = true;
return new ValidationResult(false, "!");
}
}
}
有很多例子但是所有例子都没有SAVE BUTTON。