打开文件代码：

　　　　OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Title = "选择数据源文件";
            openFileDialog.Filter = "txt文件|*.txt";
            openFileDialog.FileName = string.Empty;
            openFileDialog.FilterIndex = 1;
            openFileDialog.Multiselect = false;
            openFileDialog.RestoreDirectory = true;
            openFileDialog.DefaultExt = "txt";
            if (openFileDialog.ShowDialog() == false)
            {
                return;
            }
           string  txtFile = openFileDialog.FileName;

打开文件夹代码：

　　　　System.Windows.Forms.FolderBrowserDialog folderBrowserDialog = new System.Windows.Forms.FolderBrowserDialog();
            folderBrowserDialog.Description = "选择Word文档生成的文件夹";
            folderBrowserDialog.ShowNewFolderButton = false;
            folderBrowserDialog.RootFolder = Environment.SpecialFolder.Personal;
            folderBrowserDialog.ShowDialog();
            if (folderBrowserDialog.SelectedPath == string.Empty) 
            {
                return;
            }
            string wordFolder = folderBrowserDialog.SelectedPath;