C# 文件拖放到此程序的操作

this.textBox1.AllowDrop = true;
this.textBox1.Multiline = true;

 private void textBox1_DragDrop(object sender, DragEventArgs e)
        {
            Array aryFiles = ((System.Array)e.Data.GetData(DataFormats.FileDrop));
            for(int i = 0;i<aryFiles.Length;i++)
            {
                this.textBox1.AppendText(aryFiles.GetValue(i).ToString() + Environment.NewLine);
            }
        }

        private void textBox1_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effect = DragDropEffects.Link;
            else e.Effect = DragDropEffects.None;
        }