C# 拖拽文件到 ListBox 并排序

listBox1 属性 AllowDrop 设置为 True

以下是listBox1的两个事件实现：

	private void listBox1_DragDrop(object sender, DragEventArgs e)
	{

		string[] s = (string[])e.Data.GetData(DataFormats.FileDrop, false);
		Array.Sort(s);
		foreach (string si in s)
		{
			string epsEx = System.IO.Path.GetExtension(si);
			if (epsEx.ToLower() == ".xml") listBox1.Items.Add(si);
		}
	}

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