Question

假设我打开过相同的表单多次，但我想控制其中一个表单（一个fe带有“ hello”作为窗口标题的表单（文本） <-以标识）

我如何做到这一点？

编辑：这是我想做的事的一个例子（有点复杂，我不善于解释我想做的事）

private void openthesecformfirst_Click(object sender, EventArgs e)
{
    Form2 sec = new Form2();
    sec.Text = "Hi";
    sec.Show();
    //The second form is now opened
}

private void openthesecformsecond_Click(object sender, EventArgs e)
{
    Form2 sec = new Form2();
    sec.Text = "Hello";
    sec.Show();
    //the second form is now opened twice
}

private void changelabelinfirst_Click(object sender, EventArgs e)
{
    //Identified by the title the first opened form2 is supposed to change a label text

    //How do I get this one specifically?
}

private void changelabelinsecond_Click(object sender, EventArgs e)
{
    //Identified by the title the second opened form2 is supposed to change a label text

    //How do I get this one specifically?
}

Answer 1

对于OS Windows中的查找窗口，您可以使用Win32 Api中的FindWindowEx，例如：

因为这是原始的不安全代码，所以您应该从user32.dll导入函数：

[DllImport("user32.dll", SetLastError = true)] static extern IntPtr 
FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, 
string lpszClass, string lpszWindow);

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr 
childAfter, 
string className,  string windowTitle);

导入后，您可以使用如下功能：

 var CaptionTextForLooking = "hello"; // or "Hi"

 var foundWindowPtr = 
 FindWindowEx(IntPtr.Zero,IntPtr.Zero,CaptionTextForLooking 
 ,IntPtr.Zero);

更多信息，您可以找到here

Answer 2

您可以使用Application.OpenForms属性。

控制一种可以多次打开的表格

2 个答案: