Copy a Xaml object

<Control.Resources>
            <Button Click="Button_OnClick" x:Key="MyButton">
                <Border Margin="10" CornerRadius="4" Background="White" Width="200" Height="200">
                    <Grid>
                        <StackPanel VerticalAlignment="Top">
                            <Border Height="100" Margin="0,10,0,0">
                                <Border.Background>
                                    <ImageBrush ImageSource="/DefenseTest;component/Resources/123.png" Stretch="Uniform"/>
                                </Border.Background>
                            </Border>
                            <TextBlock Name="MyText" HorizontalAlignment="Center" Text="test"></TextBlock>
                        </StackPanel>
                    </Grid>
                </Border>
            </Button>
</Control.Resources>

然后

Button button =(Button)Resources["MyButton"];
Button button2=button.XamlClone();

你并不能直接多次(Button)Resources["MyButton"];会是同一个引用

所以需要clone下

public static class ExtensionMethods
{
    public static T XamlClone<T>(this T original)
        where T : class
    {
        if (original == null)
            return null;

        object clone;
        using (var stream = new MemoryStream())
        {
            XamlWriter.Save(original, stream);
            stream.Seek(0, SeekOrigin.Begin);
            clone = XamlReader.Load(stream);
        }

        if (clone is T)
            return (T)clone;
        else
            return null;
    }
}

https://msdn.microsoft.com/en-us/library/ms754193.aspx

但是这种方法有弊端，只能用来保存点文本和图形数据

里面的eventhandler，资源uri,，binding都会没，有的资源会形成一个自己的component，不再是引用的资源了

另外copy的对象不是一开是xaml里写好的，因为中途可能改动了，或者被优化了，然后save的就缺失了部分，也包括事件处理这些，因为序列化是被限制为逻辑树中自包含，没有可以保存事件处理的设施

我们可以通过contentcontrol来存资源

<Control.Resources>
        <DataTemplate x:Key="MyButton">
            <Button Click="Button_OnClick">
                <Border Margin="10" CornerRadius="4" Background="White" Width="200" Height="200">
                    <Grid>
                        <StackPanel VerticalAlignment="Top">
                            <Border Height="100" Margin="0,10,0,0">
                                <Border.Background>
                                    <ImageBrush ImageSource="/DefenseTest;component/Resources/123.png" Stretch="Uniform"/>
                                </Border.Background>
                            </Border>
                            <TextBlock Name="MyText" HorizontalAlignment="Center" Text="test"></TextBlock>
                        </StackPanel>
                    </Grid>
                </Border>
            </Button>
        </DataTemplate>
</Control.Resources>

这个就可以多次创建模板了

ContentControl content=new ContentControl();
content.ContentTemplate = (DataTemplate)FindResource("MyButton");
content.Loaded += (s, e) =>
{
    var textBlock = MyVisualTreeHelper.FindVisualChildItem<TextBlock>((ContentControl) content, "MyText");
    textBlock.Text = "test";
};

public static ChildItem FindVisualChildItem<ChildItem>(DependencyObject obj, string name) where ChildItem : FrameworkElement
{
            if (null != obj)
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(obj, i);
                    if (child != null && child is ChildItem && (child as ChildItem).Name.Equals(name))
                    {
                        return (ChildItem)child;
                    }
                    else
                    {
                        ChildItem childOfChild = FindVisualChildItem<ChildItem>(child, name);
                        if (childOfChild != null && childOfChild is ChildItem && (childOfChild as ChildItem).Name.Equals(name))
                        {
                            return childOfChild;
                        }
                    }
                }
            }
            return null;
}