Form.ShowDialog 方法

Question

I have created a software, which save some Information in an Excel File. The software has two possibilities:

1. To select the folder and then the software will create an Excel File with random name and there will save the data, or

2. To select an existed Excel File which is created from the user and there will save the data.

How to create a ONE ShowDialog to ask the user do you want to choose the folder or the file?!

Code that I have used to choose a Folder:

using (var fbd = new FolderBrowserDialog())
           {
               DialogResult result = fbd.ShowDialog();

               if (result == DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
               {

                   textBox3.Text = fbd.SelectedPath;

               }
          }

Code that I have used to choose a File:

OpenFileDialog excelFilename = new OpenFileDialog();

           if (excelFilename.ShowDialog() == DialogResult.OK)
           {
               textBox3.Text = excelFilename.FileName;

           }

Answer 1

Maybe something like this?:

MessageBoxResult result = MessageBox.Show("Ask user what he wants to do", "", MessageBoxButton.YesNo);

string path = null;

//MessageBoxResult.Yes means File, .No means Folder
if (result == MessageBoxResult.Yes)
{
    //File-Picker
    OpenFileDialog filePicker = new OpenFileDialog()
    {
        FileName = "Excel File",
        DefaultExt = ".xls",
        Filter = "Excel Document | *.xls"
    };

    if (filePicker.ShowDialog() == true) 
    {
        path = filePicker.FileName;
    }
}
else if (result == MessageBoxResult.No)
{
    //Folder-Picker
    CommonOpenFileDialog folderPicker = new CommonOpenFileDialog()
    {
        IsFolderPicker = true,
        Multiselect = false
    };

    path = Path.Combine(folderPicker.FileName, DateTime.Now.ToString("yyyy-MM-ddTHH-mm-ss"));
    
    //Create file in folder
    File.Create(path);
}

if (path != null)
{
    // Do something with path (file user selected/program created)
}

Make sure you have the using System.Windows , using Microsoft.Win32; and using System.IO; using's at the beginning of your program.

You also have to add the WindowsAPICodePack library to your project to use the folder-picker. You can do that with the NuGet manager. Here's the link to the library: WindowsAPICodePack - 1.1.1