Question

c#中拖放事件 打开一个文件

怎么像记事本一样 将你的文件直接拖放到窗口中就可以打开文件希望能够提供具体代码

Answer 1

假定有一个RichTextBox叫richTextBox1
窗体构造函数中：
richTextBox1.AllowDrop = true;
DragEventHandler rtba1,rtba2;
rtba1 = new DragEventHandler(richTextBox1_DragEnter);
rtba2=new DragEventHandler(richTextBox1_DragDrop);
richTextBox1.DragEnter +=rtba1;
richTextBox1.DragDrop += rtba2;

窗体所在类中添加：

void richTextBox1_DragDrop(object sender, DragEventArgs e)
{
String Path = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();
FileInfo fi = new FileInfo(Path);
String str = fi.Extension.ToUpper();
if (str == ".TXT")
{
RichTextBox rt = sender as RichTextBox;
int vv = rt.SelectionStart;
rt.Text = rt.Text.Insert(vv, File.ReadAllText(fi.FullName));
rt.SelectionStart = vv;
}
}

void richTextBox1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
e.Effect = DragDropEffects.Copy;
}
else
e.Effect = DragDropEffects.None;
}