Question

我正在尝试更新标签文字。当原始文本包含多行时，我将文本更新为具有单行的内容，即使文本在顶行更新，旧的多行仍然可见。这是一个例子。我该如何解决这个问题？

PhotoText.Text = "Testing Some\nCode Out\nRight Now!"; //This shows 3 lines
PhotoText.Refresh();    
Thread.Sleep(1000);
PhotoText.Text = "New Text!"; //This shows 1 lines
PhotoText.Refresh();
Thread.Sleep(1000);

Answer 1

您不应该阻止UI线程。分别运行长时间运行的任务：

private void button46_Click(object sender, EventArgs ee)
{            
    new Task(() =>
    {
        this.Invoke(new EventHandler((o, e) => PhotoText.Text = "Testing Some\nCode Out\nRight Now!"));           
        Thread.Sleep(1000);
        this.Invoke(new EventHandler((o, e) => PhotoText.Text = "New Text!"));
        Thread.Sleep(1000);
    }, TaskCreationOptions.LongRunning).Start();
}

this是一个表单，Invoke在UI线程上运行PhotoText.Text =...。即使没有this.BeginInvoke (see more)，您也可以使用EndInvoke。

Answer 2

尝试致电

this.Refresh();
Application.DoEvents();

每次更新之间。

Answer 3

尝试使用字符串

PhotoText.Text = "Testing Some\nCode Out\nRight Now!"; //This shows 3 lines
PhotoText.Refresh();    
Thread.Sleep(1000);
string phototext="New Text!";
PhotoText.Text = phototext; //This shows 1 lines
PhotoText.Refresh();
Thread.Sleep(1000);

更新标签文本后仍显示以前的文本

3 个答案: