c# - 在 WinForms 中关闭窗口

Question

我有两个按钮WinForm（C#File -Close和Red X）。我希望它们的行为方式相同，因此我创建了一个辅助方法，当两个不同的事件被触发时会调用它。这是我到目前为止所拥有的。

private void CloseFileOperation(object e)
{
    // If the user selected the exit buttton from the main title bar,
    // then handle the closing event properly.
    if (e is FormClosingEventArgs)
    {
        FormClosingEventArgs FormCloser = (FormClosingEventArgs)e;

        // If the Spreadsheet has been changed since the user opened it and
        // the user has requested to Close the window, then prompt them to Save
        // the unsaved changes.
        if (SpreadSheet.Changed)
        {
            DialogResult UserChoice = MessageBox.Show("Would you like to save your changes?", "Spreadsheet Utility",
                    MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);

            switch (UserChoice)
            {
                case DialogResult.Yes:
                    SaveFileOperation();
                    FormCloser.Cancel = false;
                    break;
                case DialogResult.No:
                    FormCloser.Cancel = false;
                    break;
                case DialogResult.Cancel:
                    FormCloser.Cancel = true;
                    return;
            }
        }

        // If the Spreadsheet hasn't been changed since the user opened it, then
        // simply Close the window.
        else
            FormCloser.Cancel = false;
    }

    // Otherwise the user must have selected the "Close" option from the File menu.
    // Handle the event in the following manner.
    else
    {
        // If the Spreadsheet has been changed since the user opened it and
        // the user has requested to Close the window, then prompt him to Save
        // the unsaved changes.
        if (SpreadSheet.Changed)
        {
            DialogResult UserChoice = MessageBox.Show("Would you like to save your changes?", "Spreadsheet Utility",
                    MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);

            switch (UserChoice)
            {
                case DialogResult.Yes:
                    SaveFileOperation();
                    this.Close();
                    break;
                case DialogResult.No:
                    this.Close();
                    break;
                case DialogResult.Cancel:
                    return;
            }
        }

        // If the Spreadsheet hasn't been changed since the user opened it, then
        // simply Close the window.
        else
            this.Close();
    }
}  

当用户选择Red X & File-Close选项时，我会调用此函数。请注意，当用户选择 File-Close 时，相应的操作会调用Close()操作，而该操作又会调用关闭事件。因此，警告对话框“您想保存您的更改”会显示两次。

有没有一种简单的方法可以做到这一点，类似于我目前的做法，可以消除窗口显示两次？

Answer 1

1.如果要处理表单关闭事件，无论它在哪里（从 RED X 按钮或文件->关闭按钮）处理 Form_Closing 事件，以便它是所有关闭事件调用的唯一位置。

2.如果用户说是 -> 保存 FileOperation 并保持原样以关闭表单。

注意：无需使用-> this.Close() 关闭表单

3.如果用户说不 -> 保持原样以关闭表单。

注意：无需使用-> this.Close() 关闭表单

4.如果用户说取消-> 此处表单不应关闭，因此将 FormClosingEventArgs 参数“e”属性 Cancel 更改为 true，这样关闭操作将被取消，表单将保持打开状态。

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
            {
                    // If the Spreadsheet has been changed since the user opened it and
                    // the user has requested to Close the window, then prompt him to Save
                    // the unsaved changes.
                    if (SpreadSheet.Changed)
                    {
                        DialogResult UserChoice = MessageBox.Show("Would you like to save your changes?", "Spreadsheet Utility",
                                MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);
    
                        switch (UserChoice)
                        {
                            case DialogResult.Yes:
                                SaveFileOperation();
                                break;
                            case DialogResult.No:
                                break;
                            case DialogResult.Cancel:
                                e.Cancel = true;
                                break;                              
                        }
                    }
            }

Answer 2

我将使用您用于 Red X 的事件处理程序，而不是您File->Close执行。this.Close()

例如 ->

public void FileCloseHandler() {
    RedXHandler() // instead of this.Close()
}