在WinForms中關閉Windows

Question

我在C# WinForm上有兩個按鈕（ File-Close和Red X ）。 我希望它們的行為方式相同，所以我創建了一個輔助方法，在觸發兩個不同事件時會調用該方法。 到目前為止，這就是我所擁有的。

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();
    }
}  

當用戶選擇“ 紅色X和文件關閉”選項時，我會調用此函數。 請注意，當用戶選擇“文件關閉”時，適當的操作將調用Close（）操作，該操作又將調用close事件。 結果，警告對話框“您想保存更改”顯示兩次。

有沒有一種簡單的方法可以類似於我目前的操作，從而消除兩次顯示的窗口？

Answer 1

1.如果要處理表單關閉事件（無論是從RED X按鈕還是通過File-> Close按鈕），請處理Form_Closing事件，以便它是所有關閉事件唯一調用的地方。

2.如果用戶說是->保存FileOperation並保持原樣，則關閉表單。

注意：無需使用-> this.Close（）關閉表單

3.如果用戶說“否”->保持原樣，則關閉表單。

注意：無需使用-> this.Close（）關閉表單

4.如果用戶說“取消”->“此處不應該關閉表單”，則將FormClosingEventArgs參數的“ e”屬性“取消”更改為true，這樣將取消關閉操作並且表單將保持打開狀態。

 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

而不是執行this.Close() File->Close而是使用您用於Red X的事件處理程序。

例如->

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