Question

我有一个用户控制器:

    <Grid x:Name="LayoutRoot" Background="White">
        <TextBlock Name="TextBlock1" Text="Text for"></TextBlock> 
    </Grid>

它有一个 cs 文件 :

public partial class MyUserControl: UserControl
{
    public string MyProperty { get; set; }

    public MyUserControl()
    {
        InitializeComponent();
        DoSomething();
    }

    private void DoSomething()
    {
        TextBlock1.Text = TextBlock1.Text + MyProperty;
    }
}

我想把这个用户控制程序添加到另一个用户控制中 :

            UserControls.MyUserControl myUserControl = new UserControls.MyUserControl();
            myUserControl.MyProperty = "Something";
            MyStackPanel.Children.Add(myUserControl);

我以为我以前做过这样的事没有任何问题但在这个案子里我的财产总是无效的我做错了什么?

Answer 1

您的代码是好的, 除非您正在调用 < code> Do somethinging () () 。您应该避免在控件的构建器中使用 < em> GUI 互动 , 原因很多( 其中并非最不重要的就是您的属性尚未按照 Mark Hall 的指示设定) 。 我建议不添加不同的构建符, 只取初始属性。

您只是要推迟拨打 Loaded 控制事件。

Assuming you set the event in the Xaml like this:

<navigation:Page x:Class="MyUserControl" ... Loaded="Page_Loaded">

Your code would look like:

public partial class MyUserControl: UserControl { public string MyProperty { get; set; } public MyUserControl() { InitializeComponent(); } private void Page_Loaded(object sender, RoutedEventArgs e) { DoSomething(); } private void DoSomething() { TextBlock1.Text = TextBlock1.Text + MyProperty; } }

If you want to set the Loaded event in code it would just look like:

public partial class MyUserControl: UserControl { public string MyProperty { get; set; } public MyUserControl() { InitializeComponent(); Loaded += Page_Loaded; } private void Page_Loaded(object sender, RoutedEventArgs e) { DoSomething(); } private void DoSomething() { TextBlock1.Text = TextBlock1.Text + MyProperty; } }

它只是由您来设置您想要的建筑后的所有属性, 但是在页面被加载之前, 您已经在这样做了。

UserControls.MyUserControl myUserControl = new UserControls.MyUserControl(); myUserControl.MyProperty = "Something"; MyStackPanel.Children.Add(myUserControl); // This makes it visible when Loaded event is called

Answer 2

正在发生的事情是,您在设定 < code> myProperty 之前,正在将 < code > Do somethinging 调用在您的 Contructor 中,所以 < code > MyProperty 等于空号。如果您想要在创建 < code > User Control 时数据存在, 您可以将其设置在构造器中。

或(或)

public partial class MyUserControl : UserControl
{
    public string MyProperty { get; set; }

    public MyUserControl()   //Default Constructor
    {
        InitializeComponent();
    }

    public MyUserControl(string MyData)
    {
        InitializeComponent();
        MyProperty = MyData;
        DoSomething();
    }
    private void DoSomething()
    {
        TextBlock1.Text = TextBlock1.Text + MyProperty;
    }

}

然后像这样创造它。

MyUserControl myUserControl = new MyUserControl(" Something");
MyStackPanel.Children.Add(myUserControl);

Assuming you set the event in the Xaml like this:

Your code would look like:

If you want to set the Loaded event in code it would just look like:

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