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public
partial
class
UserControl1 : WebBrowser
{ private
const
int
WmDropfiles = 0x233;
[DllImport("shell32.dll")]
private
static
extern
uint
DragQueryFile(IntPtr hDrop, uint
iFile, StringBuilder lpszFile, uint
cch);
[DllImport("shell32.dll")]
private
static
extern
void
DragAcceptFiles(IntPtr hWnd, bool
fAccept);
protected
override
void
OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
//指示接受文件拖放操作
if
(!DesignMode)
{
DragAcceptFiles(Handle, true);
}
}
protected
override
void
WndProc(ref
Message m)
{
if
(m.Msg == WmDropfiles)
{
#region 解析消息
//获取拖放的文件数量
var
count = DragQueryFile(m.WParam, 0xffffffff, null, 0);
//解析所有播放的文件路径
var
filePaths = new
string[count];
for
(uint
i = 0; i < count; i++)
{
var
sb = new
StringBuilder();
DragQueryFile(m.WParam, i, sb, 1024);
filePaths[i] = sb.ToString();
}
#endregion
//是否继续触发之后的消息处理
var
isCancel = false;
#region 触发自定义文件拖放事件
if
(DragFile != null)
{
var
args = new
DragFileEventArgs(filePaths);
DragFile(this, args);
isCancel = args.IsCancel;
}
#endregion
if
(isCancel) return;
}
base.WndProc(ref
m);
}
public
event
EventHandler<DragFileEventArgs> DragFile;
public
class
DragFileEventArgs : EventArgs
{
private
readonly
string[] _filePaths;
public
bool
IsCancel { get; set; }
public
DragFileEventArgs(string[] filePaths)
{
_filePaths = filePaths;
}
public
string[] FilePaths
{
get
{ return
_filePaths; }
}
}
} |