"确保事件失败"错误发生

Question

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:CustomCalc">
    <Style TargetType="{x:Type local:CustomControl1}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:CustomControl1}">

                    <TextBlock Text="welcome" Height="50" Width="150" MouseDown=""/>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

在上面的程序中,(在自定义控件库中的程序i锻炼中)我试图更改控件textblock =>按钮.(文本块充当按钮功能)所以我尝试向文本块添加事件它给出了一条错误消息"确保事件失败",并且此文件名为"Generic.xaml",因此我添加了一个类"Generic.xaml.cs",但显示了相同的错误.请提前解释,请解释为什么会发生以及如何解决.

Answer 1

您需要添加一个x:Class属性以支持XAML文件中的事件处理程序.所以你Generic.xaml应该看起来像这样:

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:CustomCalc"
    x:Class="CustomCalc.Generic">
    <Style TargetType="{x:Type local:CustomControl1}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:CustomControl1}">
                    <TextBlock Text="welcome" Height="50" Width="150" MouseDown="TextBlock_MouseDown"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

至于Generic.xaml.cs:

namespace CustomCalc
{
    public partial class Generic : ResourceDictionary
    {
        private void TextBlock_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {

        }
    }
}

另外不要忘记合并你ResourceDictionary的App.Xaml文件:

<Application.Resources>
    <ResourceDictionary >
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/CustomCalc;component/Generic.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>