Question

我有一个用户控制中心名为我的控制里面有三栏网格

<Grid Name="main">
  <Grid Grid.Column="0"/><Grid Grid.Column="1"/><Grid Grid.Column="2"/>
</Grid>

客户可以这样使用它,这没关系。

<myControl />

我的问题是,客户想要在“主”网格第一栏中添加元素,例如:

<myControl>
  <TextBlock Text="abc"/>
</myControl>

在此情况下, TextBlock 将取代原始内容, 这是“ 主” 网格。

我应如何支持补充内容?

Answer 1

您可使用以下方式:

// This allows "UserContent" property to be set when no property is specified
// Example: <UserControl1><TextBlock>Some Text</TextBlock></UserControl1>
// TextBlock goes into "UserContent"
[ContentProperty("UserContent")]
public partial class UserControl1 : UserControl
{
    // Stores default content
    private Object defaultContent;

    // Used to store content supplied by user
    private Object _userContent;
    public Object UserContent
    {
        get { return _userContent; }
        set
        {
            _userContent = value;
            UpdateUserContent();
        }
    }

    private void UpdateUserContent()
    {
        // If defaultContent is not set, backup the default content into it
        // (will be set the very first time this method is called)
        if (defaultContent == null)
        {
            defaultContent = Content;
        }

        // If there is something in UserContent, set it to Content
        if (UserContent != null)
        {
            Content = UserContent;
        }
        else // Otherwise load default content back
        {
            Content = defaultContent;
        }
    }

    public UserControl1()
    {
        InitializeComponent();
    }
}

友情链接