Question

for (int r = 0; r < m; r++)
            {

            TextBlock myTextBlockr = new TextBlock() { Text = "Text Block", Width = 350, Height = 40, FontSize = 20, VerticalAlignment = VerticalAlignment.Center, TextAlignment = TextAlignment.Center, HorizontalAlignment = HorizontalAlignment.Center };
            string name = "TextBlock" + r.ToString();
            myTextBlockr.Name = name;
            ListBox list = new ListBox() { Height = 200, Width = 200 };
            string k="list"+r;    
            list.Name = k;
            }

我已经动态创建了列表框。我想控制其在其他函数中的可见性。我使用了activator.createinstance方法，但它抛出了异常。

 public void myTextBlock1_Tap(object sender, System.Windows.Input.GestureEventArgs e) 
    {


        string name = ((TextBlock)sender).Name;
     //   name.Substring(10,9);
        string strl = "list" + name.Substring(9);
        object obj = Activator.CreateInstance(typeof(ListBox), strl);
        ListBox list = (ListBox)obj;
        list.Visibility = Visibility.Visible;


    }

抛出以下异常System.missingmethodexception。

Answer 1

如果您以后需要引用它，请在类中保留对ListBox的引用。如果您要创建多个列表框，请将它们添加到Dictionary<string, ListBox>，以便以后可以通过键查找它们。

public class Demo {
   private Dictionary<string, ListBox> _listboxes = new Dictionary<string, ListBox>();

   private void CreateListBoxWithName(string name) {
      var lb = new ListBox();
      _listboxes.add(name, lb);
      // do other stuff ...
   }

   private ListBox FindListBoxByName(string name) {
      return _listboxes[name];
   }
}

控制在其他功能中动态创建列表框属性

1 个答案: