C#-支持文件拖拽

        private void listBox1_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Copy;
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }
        }


 private void listBox1_DragDrop(object sender, DragEventArgs e)
        {
            string[] test = (string[])e.Data.GetData(DataFormats.FileDrop, false);
            //MessageBox.Show(test[0].ToString());
            Tps1.Clear();
            listBox1.Items.Clear();
            try
            {
                if (test[0].ToString().Contains(".txt"))
                {
                    StreamReader sr1 = new StreamReader(test[0].ToString(), Encoding.UTF8);
                    string line1;
                    while ((line1 = sr1.ReadLine()) != null)
                    {
                        if (line1.Trim() == "")
                            continue;
                        Tps1.Add(line1);
                        listBox1.Items.Add(line1);
                    }
                    sr1.Close();
                    sr1.Dispose();
                }
            }
            catch { MessageBox.Show("文件不能识别!"); }
        }