xml 将多重绑定放在 xaml 的一行上
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原文地址: http://stackoverflow.com/questions/2959885/
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putting multibinding on a single line in xaml
提问by Adam S
Is there a way to take this multibinding:
有没有办法采取这种多重绑定：
<TextBox.IsEnabled>
<MultiBinding Converter="{StaticResource LogicConverter}">
<Binding ElementName="prog0_used" Path="IsEnabled" />
<Binding ElementName="prog0_used" Path="IsChecked" />
</MultiBinding>
</TextBox.IsEnabled>
and put is all on one line, as in <TextBox IsEnabled="" />?
并把全部放在一行上，如<TextBox IsEnabled="" />？
If so, where can I learn the rules of this formattiong?
如果是这样，我在哪里可以学习这种格式的规则？
采纳答案by hemp
A better (and simpler) approach would be to define a style as a resource which you can easily apply to any TextBox:
更好（也更简单）的方法是将样式定义为可以轻松应用于任何 TextBox 的资源：
<Window.Resources>
<c:MyLogicConverter x:Key="LogicConverter" />
<Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}" x:Key="MultiBound">
<Setter Property="IsEnabled">
<Setter.Value>
<MultiBinding Converter="{StaticResource LogicConverter}">
<Binding ElementName="switch" Path="IsEnabled" />
<Binding ElementName="switch" Path="IsChecked" />
</MultiBinding>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<StackPanel Orientation="Horizontal">
<CheckBox Name="switch" />
<TextBox Name="textBox2" Text="Test" Style="{StaticResource MultiBound}" />
</StackPanel>
回答by Athari
This can be done with a custom markup extension:
这可以通过自定义标记扩展来完成：
public class MultiBinding : System.Windows.Data.MultiBinding
{
public MultiBinding (BindingBase b1, BindingBase b2)
{
Bindings.Add(b1);
Bindings.Add(b2);
}
public MultiBinding (BindingBase b1, BindingBase b2, BindingBase b3)
{
Bindings.Add(b1);
Bindings.Add(b2);
Bindings.Add(b3);
}
// Add more constructors if you need.
}
Usage:
用法：
<TextBox IsEnabled="{local:MultiBinding
{Binding IsEnabled, ElementName=prog0_used},
{Binding IsChecked, ElementName=prog0_used},
Converter={StaticResource LogicConverter}}">
回答by John Bowen
For MultiBinding there is no shorthand string. You need to use the expanded element syntax.
对于 MultiBinding，没有速记字符串。您需要使用扩展元素语法。
回答by Christian Myksvoll
I tried using Discord's answer, but it didn't work right out of the box. To make it work I added a new constructor:
我尝试使用 Discord 的答案，但它无法立即使用。为了使它工作，我添加了一个新的构造函数：
public class MultiBinding : System.Windows.Data.MultiBinding
{
public MultiBinding(BindingBase b1, BindingBase b2, object converter)
{
Bindings.Add(b1);
Bindings.Add(b2);
Converter = converter as IMultiValueConverter;
}
}
Usage will then be like this:
用法将如下所示：
<TextBox IsEnabled="{local:MultiBinding {Binding IsEnabled, ElementName=prog0_used},
{Binding IsChecked, ElementName=prog0_used},
{StaticResource LogicConverter}}">
