C# Windows 窗体 - 使用 Multi Select、OpenFileDialog 和 FolderBrowserDialog 选择和复制多个文件

Question

我正在使用带有 OpenFileDialog 和 FileBrowserDialog 的 C# 开发 WinForms 应用程序，我想：

1. 启用选择多个 xls 文件。
2. 选择后，在文本框中显示选定的 xlsx 文件名
3. 将选定的文件复制到单独的目录合并

我怎样才能做到这一点？

Answer 1

OpenFileDialog 的 MultiSelect 属性需要设置为 true 以允许选择多个文件。

Here is a code example 来自 MSDN，它允许用户选择多个图像并将它们显示在窗体上的 PictureBox 控件中：

private void Form1_Load(object sender, EventArgs e)
{
  InitializeOpenFileDialog();
}

private void InitializeOpenFileDialog()
{
  // Set the file dialog to filter for graphics files.
  this.openFileDialog1.Filter =
    "Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" +
    "All files (*.*)|*.*";

  // Allow the user to select multiple images.
  this.openFileDialog1.Multiselect = true;
  this.openFileDialog1.Title = "My Image Browser";
}

private void selectFilesButton_Click(object sender, EventArgs e)
{
  DialogResult dr = this.openFileDialog1.ShowDialog();
  if (dr == System.Windows.Forms.DialogResult.OK)
  {
    // Read the files
    foreach (String file in openFileDialog1.FileNames) 
    {
        // Create a PictureBox.
        try
        {
            PictureBox pb = new PictureBox();
            Image loadedImage = Image.FromFile(file);
            pb.Height = loadedImage.Height;
            pb.Width = loadedImage.Width;
            pb.Image = loadedImage;
            flowLayoutPanel1.Controls.Add(pb);
        }
        catch (SecurityException ex)
        {
            // The user lacks appropriate permissions to read files, discover paths, etc.
            MessageBox.Show("Security error. Please contact your administrator for details.\n\n" +
                "Error message: " + ex.Message + "\n\n" +
                "Details (send to Support):\n\n" + ex.StackTrace
            );
        }
        catch (Exception ex)
        {
            // Could not load the image - probably related to Windows file system permissions.
            MessageBox.Show("Cannot display the image: " + file.Substring(file.LastIndexOf('\\'))
                + ". You may not have permission to read the file, or " +
                "it may be corrupt.\n\nReported error: " + ex.Message);
        }
    }
}

Answer 2

这里是示例代码：

        OpenFileDialog od = new OpenFileDialog();
        od.Filter = "XLS files|*.xls";
        od.Multiselect = true;
        if (od.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            string tempFolder = System.IO.Path.GetTempPath();

            foreach (string fileName in od.FileNames)
            {
                System.IO.File.Copy(fileName, tempFolder + @"\" + System.IO.Path.GetFileName(fileName));
            }
        }

Answer 3

结合这两个答案，这是我想出的代码：

• 使用户能够选择多个 XLSX 文件（使用 MultiSelect、OpenFileDialog、this.OpenFileDialog Properties 和 FileBrowserDialog）
• 选择后，在文本框中显示选定的 XLSX 文件名（通过将 textBoxSourceFiles.Text 值设置为 sourceFileOpenFileDialog.FileNames）

• 将所选文件复制到单独的合并目录（使用 foreach 循环、System.IO.File.Copy、System.IO.Path.GetFileName、sourceFileOpenFileDialog.FileName）

  private void sourceFiles_Click(object sender, EventArgs e)
  {
      Stream myStream;
      OpenFileDialog sourceFileOpenFileDialog = new OpenFileDialog();
  
      this.sourceFileOpenFileDialog.InitialDirectory = "i:\\CommissisionReconciliation\\Review\\";
      this.sourceFileOpenFileDialog.Filter = "Excel Files (*.xls;*.xlsx;)|*.xls;*.xlsx;|All Files (*.*)|*.*";
      this.sourceFileOpenFileDialog.FilterIndex = 2;
      this.sourceFileOpenFileDialog.RestoreDirectory = true;
      this.sourceFileOpenFileDialog.Multiselect = true;
      this.sourceFileOpenFileDialog.Title = "Please Select Excel Source File(s) for Consolidation";
  
      if (sourceFileOpenFileDialog.ShowDialog() == DialogResult.OK)
      {
          try
          {
              if ((myStream = sourceFileOpenFileDialog.OpenFile()) != null)
              {
                  using (myStream)
                  {
                      // populates text box with selected filenames 
                      textBoxSourceFiles.Text = sourceFileOpenFileDialog.FileNames; 
                  }
              }       // ends if 
          }           // ends try 
  
          catch (Exception ex)
          {
              MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
          }
      }              // ends if (sourceFileOpenFileDialog.ShowDialog() == DialogResult.OK)
  }                  // ends public void sourceFiles_Click
  
  private void consolidateButton_Execute_Click(object sender, EventArgs e)
  {
  
      string consolidatedFolder = targetFolderBrowserDialog.SelectedPath; 
  
          foreach (String file in sourceFileOpenFileDialog.FileNames)
          {
              try
              {
                  // Copy each selected xlsx files into the specified TargetFolder 
  
                  System.IO.File.Copy(sourceFileOpenFileDialog.FileName, consolidatedFolder + @"\" + System.IO.Path.GetFileName(sourceFileOpenFileDialog.FileName));
                  Log("File" + sourceFileOpenFileDialog.FileName + " has been copied to " + consolidatedFolder + @"\" + System.IO.Path.GetFileName(sourceFileOpenFileDialog.FileName));
              }  
          }          // ends foreach loop
  }                  // ends void consolidateButton_Execute_Click