如果显示消息框，则暂停c＃wpf应用程序中该函数的其余执行

问题描述

我有以下方法为用户浏览文件。

public void browseFile(TextBox filanametextBox,TextBlock textblocname,DataGrid datagrid,Button browsebutton,Button loadbutton)
        {
            // Create OpenFileDialog
            OpenFileDialog openFileDlg = new OpenFileDialog();

            // Launch OpenFileDialog by calling ShowDialog method
            Nullable<bool> result = openFileDlg.ShowDialog();

            // Get the selected file name and display in a TextBox.
            // Load content of file in a TextBlock
            if (result == true)
            {
                filanametextBox.Text = openFileDlg.FileName;
                textblocname.Text = "Created on: " + File.GetCreationTime(openFileDlg.FileName).ToString() + "\n";

                //Debug.WriteLine(File.GetCreationTime(openFileDlg.FileName).ToString());

                var datatablematrix = ConvertToDataTable(filePath: openFileDlg.FileName);

                if (browsebutton.Name.ToString()=="browseButton")
                {
                    if (!filanametextBox.Text.Contains("Files.csv"))
                    {
                        MessageBox.Show("The file imported is an invalid format file! \n Please check that you have imported the correct one.","Warning",MessageBoxButton.OK,MessageBoxImage.Exclamation);
                    }
                }

                else if (browsebutton.Name.ToString()=="browseButtonLayout")
                {
                    if (!filanametextBox.Text.Contains("Layout.csv"))
                    {
                        MessageBox.Show("The file imported is an invalid layout file! \n Please check that you have imported the correct one.",MessageBoxImage.Exclamation);
                    }
                }

                else if (browsebutton.Name.ToString() == "browseButtonBC")
                {
                    if (!filanametextBox.Text.Contains("BusinessChecks.csv"))
                    {
                        MessageBox.Show("The file imported is an invalid business checks file! \n Please check that you have imported the correct one.",MessageBoxImage.Exclamation);
                    }
                }

                datagrid.DataContext = datatablematrix.defaultview;
            }

            // Set filter for file extension and default file extension  
            openFileDlg.DefaultExt = ".txt";
            openFileDlg.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";

            // Set initial directory
            openFileDlg.InitialDirectory = @"C:\Documents\";

            // Multiple selection with all file types    
            openFileDlg.Multiselect = true;

            browsebutton.IsEnabled = true;
            loadbutton.IsEnabled = true;
        }

我想以某种方式是由三个if语句之一触发消息框以中止该函数其余部分的执行。这意味着不会填充数据表，也不会启用loadbutton。

应用的初始状态

消息框上的状态

当用户将在消息框上单击“确定”时，我希望仍禁用“加载”按钮，并且数据网格表（黑盒）未填充值。

在网上搜索时，我发现了一个SO问题，该问题主张创建布尔函数。虽然，我不太确定如何在我的单个函数中嵌入this解决方案。

解决方法

我想通过某种方式触发消息框时 三个if语句可停止其余的执行 功能。

如果要停止在c＃中进一步执行某个函数，可以使用return;，它退出当前函数，而无需执行任何其他代码。

private bool ExampleVoid() {
    MessageBox.Show("The file imported is an invalid layout file! \n Please check that 
        + you have imported the correct one.","Warning",MessageBoxButton.OK,MessageBoxImage.Exclamation);
    
    // Return out of function because an error happened
    return;
}

请注意，如果您的函数返回某些信息（例如布尔值），则需要在返回语句中添加相应的值。如果是布尔函数，则为false或true。

示例：

private bool ExampleBool() {
    // Halt Execution of Function and return out of it
    return false;

   // Code Below the return statement is not executed
}

Return Documentation