Question

我的用户控件由于空字段而无法启动，我真的很生气，我的代码位于：

       public MyControl()
       {
        protected override void OnInitialized(EventArgs e)
        {
         base.OnInitialized(e);
         string userinputMainWindow = (string)App.Current.Properties["TextBoxString"];
         Foreach
         {
            TextBlock textBlock2 = new TextBlock();
            textBlock2.Text = String.Format(userinputMainWindow); // null
            textBlock2.TextAlignment = TextAlignment.Left;

但是我不认为这是我需要的，如何在启动时停止代码初始化并且只在我调用代码时初始化？

例如在我的主窗口上，我将这样的用户控件称为：

    private Dictionary<string, UserControl> _userControls = new Dictionary<string, UserControl>();
    public Dictionary<string, UserControl> GetUserControls()
    {
        return _userControls;
    }
    public MainWindow()
    {
        InitializeComponent();

        List<string> userControlKeys = new List<string>();
        userControlKeys.Add("MyControl");
        Type type = this.GetType();
        Assembly assembly = type.Assembly;
        foreach (string userControlKey in userControlKeys)
        {
            string userControlFullName = String.Format("{0}.UserControls.{1}", type.Namespace, userControlKey);
            UserControl userControl = (UserControl)assembly.CreateInstance(userControlFullName);
            _userControls.Add(userControlKey, userControl);
        }

    }
    private void btnGeneral_Click(object sender, RoutedEventArgs e)
    {

        App.Current.Properties["TextBoxString"] = textBox1.Text;

        PanelMainContent.Children.Clear();
        Button button = (Button)e.OriginalSource;
        Type type = this.GetType();
        Assembly assembly = type.Assembly;

        PanelMainContent.Children.Add(_userControls[button.Tag.ToString()]);
    }

有没有办法停止用户控件初始化，只有当我点击btnGeneral_Click时？

Answer 1

在WPF中，这类事情通常是通过数据绑定完成的，但是只需在用户控件上设置属性，然后再将其添加到面板中，即可快速完成此工作。

向用户控件添加属性：

public string TextBlockString
{
    get
    {
        return this.textBlock2.Text;
    }

    set
    {
        this.textBlock2.Text = value;
    }
}

然后在btnGeneral_Click：

private void btnGeneral_Click(object sender, RoutedEventArgs e)
{

    App.Current.Properties["TextBoxString"] = textBox1.Text;

    PanelMainContent.Children.Clear();
    Button button = (Button)e.OriginalSource;
    Type type = this.GetType();
    Assembly assembly = type.Assembly;

    MyControl myControl = _userControls[button.Tag.ToString()];
    myControl.TextBlockString = textBox1.Text;

    PanelMainContent.Children.Add(myControl);
}

由于空字段，用户控件无法启动

1 个答案: