通过运行时加载XAML XML？ [英] Loading XAML XML through runtime?

问题描述

我们正在迁移到的WinForms到WPF的解决方案。我们有用于构建在运行时，Windows窗体的自定义XML定义。

We are migrating to Winforms to WPF based solution. We have custom XML definition which are used to build the windows form at runtime.

由于XAML是基于XML的，我们可以定义使用XAML定义一个HelloWorldWindow.xml文件，并可以将其加载到WPF应用程序不落后CSHARP文件的任何code？我们将附上背后勾code运行时。

Since XAML is XML based, can we define a HelloWorldWindow.xml file with XAML definition and can it be loaded into the WPF app without any code behind CSharp files? We will attach the code behind hook at runtime.

如何背后附上code运行时？

How to attach the code behind at runtime?

推荐答案

使用此XAML创建一个XML文件Tempwin.xml

Create an XML file Tempwin.xml using this XAML

<UserControl 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="300" Width="300" Background="Transparent" >
<Border Background="Black" CornerRadius="10" BorderThickness="4" BorderBrush="RoyalBlue">
<Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <TextBlock Text="Sample Text" Foreground="White" Margin="2"></TextBlock>
        <TextBox Grid.Row="1" Margin="5"> </TextBox>
        <TextBlock Text="Sample Text 1" Grid.Row="2" Foreground="White" Margin="2"></TextBlock>
        <TextBox Grid.Row="3" Margin="5"></TextBox>
        <Ellipse Fill="Red" Height="100" Width="100" Grid.Row="4" Margin="0,10,0,0"></Ellipse>
    </Grid>
    </Border>

与下面的XAML创建示例WPF应用程序

Create a sample WPF Application with the below xaml

<Window x:Class="WpfApplication12.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="600" Width="600">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition/>

    </Grid.RowDefinitions>

    <Button Height="25" Width="100" Margin="2" Click="Button_Click"> Show Content</Button>
    <Grid x:Name="content" Grid.Row="1" Margin="2">

    </Grid>
</Grid>

粘贴以下的C＃code $ c中cbehind的Button_Click $

Paste the below C# code in codebehind the Button_Click

  StreamReader mysr = new StreamReader(@"D:\Tempwin.xml");
        FrameworkElement  rootObject = XamlReader.Load(mysr.BaseStream) as FrameworkElement;
        content.Children.Add(rootObject);

如果要加载XAML在运行时，你不能给你背后的XAML文件中的任何code。因此，我已删除了X：创建XML之前类属性

if you want to load xaml at runtime you cannot give any code behind your XAML file. So i have removed the x:Class attribute before creating the xml

活动挂钩....

<UserControl 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="300" Width="300" Background="Transparent" >
<Border Background="Black" CornerRadius="10" BorderThickness="4" BorderBrush="RoyalBlue">
<Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <TextBlock Text="Sample Text" Foreground="White" Margin="2"></TextBlock>
        <TextBox Grid.Row="1" Margin="5"> </TextBox>
        <TextBlock Text="Sample Text 1" Grid.Row="2" Foreground="White" Margin="2"></TextBlock>
        <TextBox Grid.Row="3" Margin="5"></TextBox>
        <Ellipse Fill="Red" Height="100" Width="100" Grid.Row="4" Margin="0,10,0,0"></Ellipse>
        <Button Grid.Row="5" Height="25" Content="Event added at Runtime" x:Name="btnTest"></Button>
    </Grid>
    </Border>

Button ButtoninXAML;

    private void Button_Click(object sender, RoutedEventArgs e)
    {

        StreamReader mysr = new StreamReader(@"D:\Tempwin.xml");
        FrameworkElement  rootObject = XamlReader.Load(mysr.BaseStream) as FrameworkElement;
        ButtoninXAML = LogicalTreeHelper.FindLogicalNode(rootObject, "btnTest") as Button;
        ButtoninXAML.Click += new RoutedEventHandler(Button_Click1); 

        content.Children.Add(rootObject);

    }
    private void Button_Click1(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("Added At Runtime");
    }

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