[英]WPF How do I evaluate a property to make binding
I'm doing a custom control for our company, and I want to define DataTemplate of elements into a ResourceDictionary, for more genericity and skin handling. 我正在为我们的公司做一个自定义控件,我想将元素的DataTemplate定义到ResourceDictionary中,以实现更多通用性和外观处理。 My control has a ItemsSource property that contains all collection.
我的控件具有包含所有集合的ItemsSource属性。 I also have a DependencyProperty into my control that specificy the name of the property of current Item to bind on.
我的控件中也有一个DependencyProperty,它具体说明了要绑定的当前Item属性的名称。
Some code : 一些代码:
<DataTemplate x:Key="VEGA_TokenTemplate">
<Border x:Name="Bd" BorderBrush="{StaticResource VEGA_TokenBorderBrush}" BorderThickness="1" Background="{StaticResource VEGA_TokenBackgroundBrush}" Padding="1" Margin="1,5" HorizontalAlignment="Stretch" SnapsToDevicePixels="True">
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding WHAT_HERE}" HorizontalAlignment="Stretch" VerticalAlignment="Center" />
<Button Background="Transparent" Content="X" VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="10" FontFamily="Berlin Sans FB" Grid.Column="1" Command="{Binding RelativeSource={RelativeSource AncestorType=local:TokenTextBox}, Path=TokenDeleteButtonCommand}"
CommandParameter="{Binding WHAT_HERE}" IsEnabled="True" />
</Grid>
</Border>
</DataTemplate>
In this DataTemplate, I would like to replace the WHAT_HERE tag by the evaluation of my dependency property. 在此DataTemplate中,我想通过对依赖项属性的评估来替换WHAT_HERE标记。 For example, if I set "Email" on my dependency property, I would like the Binding to be like "Path=Email".
例如,如果我在依赖项属性上设置“ Email”,则希望绑定就像“ Path = Email”。 However, I only have "Email" as litteral into my component.
但是,我的组件中仅包含“电子邮件”。 How can I do such a Binding ?
我该如何进行绑定?
I hope I'm clear in my explainations... 我希望我的解释很清楚...
Thank you 谢谢
I would use Behaviors in this situation or attached properties. 我会在这种情况下或附加的属性中使用行为。 I am sure there are other variation of how you can accomplish this.
我敢肯定,您如何完成此操作还有其他变化。 But here is one way to give you an idea
但这是给你一个想法的一种方法
//test interface and test class
public interface IProvidePropertyToBindTo
{
string GetPropertyToBindTo();
}
public class TestChoosingPropertyToBind : IProvidePropertyToBindTo, INotifyPropertyChanged
{
#region Fields
public event PropertyChangedEventHandler PropertyChanged;
private string _emailAddress;
private string _name;
private string _propertyName;
#endregion Fields
#region Properties
public string EmailAddress
{
get { return _emailAddress; }
set
{
if (_emailAddress == value)
return;
_emailAddress = value;
OnPropertyChanged();
}
}
public string Name
{
get { return _name; }
set
{
if (_name == value)
return;
_name = value;
OnPropertyChanged();
}
}
public string PropertyToBindTo
{
set { SetPropertToBindTo(value); }
}
#endregion
#region Methods
public string GetPropertyToBindTo()
{
return _propertyName;
}
public void SetPropertToBindTo(string propertyName)
{
var prop = GetType().GetProperty(propertyName);
if (prop == null)
throw new Exception("Property : "+propertyName+" does not exist in this object {"+this.ToString()+"}.");
_propertyName = propertyName;
}
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
#endregion Methods
}
Test Data 测试数据
public ObservableCollection<TestChoosingPropertyToBind> Test
{
get
{
return new ObservableCollection<TestChoosingPropertyToBind>(
new List<TestChoosingPropertyToBind>()
{
new TestChoosingPropertyToBind(){EmailAddress = "Test@test.com", PropertyToBindTo = "EmailAddress"},
new TestChoosingPropertyToBind(){Name = "Test", PropertyToBindTo = "Name"}
}
);
}
}
An edited snippet of your data template with the custom behavior 具有自定义行为的数据模板的经过修改的代码段
<DataTemplate x:Key="VEGA_TokenTemplate">
<Border x:Name="Bd" BorderBrush="Red" BorderThickness="1" Background="White" Padding="1" Margin="1,5" HorizontalAlignment="Stretch" SnapsToDevicePixels="True">
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding WHAT_HERE}" HorizontalAlignment="Stretch" VerticalAlignment="Center" >
<i:Interaction.Behaviors>
<BehaviorLocationNamespace:MyCustomBehavior></BehaviorLocationNamespace:MyCustomBehavior>
</i:Interaction.Behaviors>
</TextBlock>
<Button Background="Transparent"
Content="X"
VerticalAlignment="Center"
HorizontalAlignment="Center"
FontSize="10" FontFamily="Berlin Sans FB" Grid.Column="1" IsEnabled="True" />
</Grid>
</Border>
</DataTemplate>
//Items Control usage
<ItemsControl ItemTemplate="{StaticResource VEGA_TokenTemplate}" ItemsSource="{Binding Test}">
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.