[C#]richtextbox实现拖放

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();



            richTextBox1.AllowDrop = true;

            richTextBox1.DragEnter += new DragEventHandler(richTextBox1_DragEnter);

            richTextBox1.DragDrop += new DragEventHandler(richTextBox1_DragDrop);

        }



        private void richTextBox1_DragEnter(object sender, DragEventArgs e)

        {

            if (e.Data.GetDataPresent(DataFormats.FileDrop))

            {

                e.Effect = DragDropEffects.Link;

            }

            else

            {

                e.Effect = DragDropEffects.None;

            }

        }



        private void richTextBox1_DragDrop(object sender, DragEventArgs e)

        {

            Array arrayFileName = (Array)e.Data.GetData(DataFormats.FileDrop);



            string strFileName = arrayFileName.GetValue(0).ToString();



            StreamReader sr = new StreamReader(strFileName,System.Text.Encoding.Default);

            richTextBox1.Text = sr.ReadToEnd();

            sr.Close();

        }

    }

}