MVVM模式下的OpenFileDialog

    public interface IIOService
    {
        string OpenFileDialog(string srcFilter = "");

        IList<string> OpenFileDialogMultiselect(string srcFilter = "");

        string FolderBrowserDialog();
    }

   public class IOService : IIOService
    {
        public string OpenFileDialog(string srcFilter = "")
        {
            var op = new System.Windows.Forms.OpenFileDialog();
            op.Filter = srcFilter;
            if (op.ShowDialog() == System.Windows.Forms.DialogResult.OK)            
                return op.FileName;
            
            return "";
        }

        public IList<string> OpenFileDialogMultiselect(string srcFilter = "")
        {
            var op = new System.Windows.Forms.OpenFileDialog();
            op.Filter = srcFilter;
            op.Multiselect = true;
            if (op.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                return op.FileNames;
            return new List<string>();
        }

        public string FolderBrowserDialog()
        {
            var path = new System.Windows.Forms.FolderBrowserDialog();
            var result = path.ShowDialog();
            if (result == System.Windows.Forms.DialogResult.OK)            
                return path.SelectedPath;
            
            return string.Empty;
        }
    }