wpf ElementHost没有显示

Question

我对这个ElementHost有很大的问题。谁能看看我有什么，让我知道发生了什么事，或为什么这没有显示？一切似乎都正常，只是我看不到屏幕上显示/刷新的ElementHost (用户控件)。

Test.cs.designer

this.TestHost.Dock = System.Windows.Forms.DockStyle.Fill;
this.TestHost.Location = new System.Drawing.Point(5, 5);
this.TestHost.Name = "TestHost";
this.TestHost.Size = new System.Drawing.Size(1139, 213);
this.TestHost.TabIndex = 1;
this.TestHost.Text = "elementHost1";
this.TestHost.Child = this.testview1;
this.TestHost.Visible = true;

Test.cs

private void btnTest_Click(object sender, EventArgs e)
{
    LoadView(item);
}

public void LoadView(Person item)
{
    TestHost.Child = this.testview1; //name given when drag/drop .. should still reference wpf TestView xaml

    try
    {
        if (item != null)
        {
            // TestView is WPF xaml/View                
            TestView view = new TestView();
            view = (TestView) TestHost.Child;
            //TestViewModel is a viewmodel

            TestViewModel vm = (TestViewModel) view.DataContext;
            //load items from viewmodel             
            vm.LoadItems(item);
        }   

        TestHost.Visible = true;
    }
    catch(Exception ex)
    {
        ex.ToString();
    }
}

Answer 1

从您的代码来看，您将您的elementhost子程序设置为一个类，而不是它的一个实例(它不会编译)。我的问题是 TestView实例来自哪里？

TestHost.Child = TestView;

要进行调试，在try/catch块中更改'ex.ToString()‘以显示消息框；如果出现异常，您将注意到它。