c#:如何告诉一个窗体另一个窗体已关闭

本文关键字:窗体 一个 另一个 何告诉 | 更新日期: 2023-09-27 18:15:28

我有一个名为frmMain的表单,其中我有以下函数:

public void openFullScreen(String id,String content)
{
    frmEditor Editor = new frmEditor();
    Editor.WindowState = FormWindowState.Maximized;
    Editor.Content = content;
    Editor.ID = id;
    Editor.ShowDialog();
}

在Editor.cs我使用以下代码:

private void btnClose_Click(object sender, EventArgs e)
{
    Object content = browserEditor.Document.InvokeScript("getContent");
    if (content != null)
    {
        object[] args = new object[2];
        args[0] = content.ToString();
        args[1] = _id;
        AppDomain.CurrentDomain.SetData("EditorContent", args);
        this.Close();
        //browserEditor.Document.InvokeScript("setEditorContent",args)
    }
}

ON关闭frmEditor我想告诉frmMain frmEditor现在已关闭,在知道我必须显示某个值时。我怎么检查这个?

c#:如何告诉一个窗体另一个窗体已关闭

ShowDialog方法阻塞,直到对话框关闭。

您可以使用此方法在应用程序中显示模态对话框。调用此方法时,直到对话框关闭后才执行其后的代码。对话框可以通过将对话框赋值给窗体上按钮的对话框sult属性或通过在代码中设置窗体的对话框sult属性来赋值。这个值然后由这个方法返回。

要返回结果,您可以设置Form中内置的dialgresult属性。如果该类型不适合您的需要,请在Editor中声明一个属性,并在ShowDialog返回时检索它。

public partial class Editor : Form
{
    public string YourReturnValue { get; private set; }
    private void btnClose_Click(object sender, EventArgs e)
    {
        // you code here...
        YourReturnValue = "Something you want to return";
    }
 }

然后在openForm

public void openFullScreen(String id,String content)
{
    frmEditor Editor = new frmEditor();
    Editor.WindowState = FormWindowState.Maximized;
    Editor.Content = content;
    Editor.ID = id;
    Editor.ShowDialog( this );
    string retval = Editor.YourReturnValue;
}

需要注意的重要一点是,仅仅因为窗体是封闭的,并不意味着对象已被析构。当Editor变量在作用域中时,它仍然是可访问的。

作为题外话,我建议将一个所有者传递给ShowDialog。

订阅FormClosed事件编辑器实例:

private void InitializeChildForm()
{
    var child = new ChildForm();
    child.FormClosed += ChildFormClosed;
    child.ShowDialog();
}
void ChildFormClosed(object sender, FormClosedEventArgs e)
{
    MessageBox.Show("Child form was closed.");
}
//you can use DialogResult  object to know to other form is closed
// DialogResult dlgResult = DialogResult.None;
public void openFullScreen(String id,String content)
{
      DialogResult dlgResult = DialogResult.None;  
    frmEditor Editor = new frmEditor();`enter code here`
    Editor.WindowState = FormWindowState.Maximized;
    Editor.Content = content;
    Editor.ID = id;
    dlgResult=Editor.ShowDialog();
      if (dlgResult == System.Windows.Forms.DialogResult.OK)
      { 
               // code that you will execute after Editor form is closed
      }
}

private void btnClose_Click(object sender, EventArgs e)
{
    Object content = browserEditor.Document.InvokeScript("getContent");
    if (content != null)
    {
        object[] args = new object[2];
        args[0] = content.ToString();
        args[1] = _id;
        AppDomain.CurrentDomain.SetData("EditorContent", args);
   /* use:  this.DialogResult = System.Windows.Forms.DialogResult.OK;   instead of this.close */
        this.DialogResult = System.Windows.Forms.DialogResult.OK;//this.Close();
        //browserEditor.Document.InvokeScript("setEditorContent",args)
    }
}