更改样式按钮的内容？ [英] Change a button's content in a style?

问题描述

我试图做一些类似的：

<Window x:Class="WpfApplication1.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Grid>
        <Button>
            <Button.Style>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="Content"
                            Value="No mouse over" />
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver"
                                 Value="True">
                            <Setter Property="Content">
                                <Setter.Value>
                                    <CheckBox Content="Mouse is over" />
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
        </Button>
    </Grid>
</Window>

不过，我得到的消息，一个运行时XamlParseException：

However, I get a run-time XamlParseException with a message of:

无法添加$输入
'System.Windows.Controls.CheckBox'的内容b $ b类型的对象'System.Object的。在对象

错误'System.Windows.Controls.CheckBox

Cannot add content of type 'System.Windows.Controls.CheckBox' to an object of type 'System.Object'. Error at object 'System.Windows.Controls.CheckBox

实际上，我想得出不同图标取决于外部条件按钮的内容。所以我实际上是试图用一个DataTrigger，但上面的例子中简化了问题。任何想法？

I'm actually trying to draw different icons for the button's content depending on external conditions. So I'm actually trying to use a DataTrigger, but the example above simplifies the problem. Any ideas?

推荐答案

实际的错误发生，因为视觉不能直接被设置成一个二传手的价值。
你可以，或者通过创建自己的内容作为一种资源，无论是特定的按钮，或位于其他地方得到你正在寻找的，虽然行为，通过设置使用一个DataTemplate中的ContentTemplate。

The actual error is occurring because Visuals can not be directly set as a Setter value. You can get the behavior you are looking for though, by setting the ContentTemplate using a DataTemplate, or by creating your content as a resource, either specific to the button or located elsewhere.

<Button>
    <Button.Resources>
        <CheckBox x:Key="Local_MouseOverContent" Content="Mouse is over" />
    </Button.Resources>
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Setter Property="Content" Value="No mouse over" />
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Content"
                            Value="{StaticResource Local_MouseOverContent}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

<Button>
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Setter Property="Content" Value="No mouse over" />
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="ContentTemplate">
                        <Setter.Value>
                            <DataTemplate DataType="Button">
                                <CheckBox Content="Mouse is over" />
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

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