Question

c#怎么通过重写 WndProc函数来同时实现无标题栏的窗体移动和禁止双击窗体最大化

因为我已经实现了无标题栏窗体的移动，当双击窗体时，会使窗体最大化，我想禁止找个消息，怎么写呢
protected override void WndProc(ref Message m)
{
const int WM_NCHITTEST = 0x84;
const int HTCLIENT = 0x01;
const int HTCAPTION = 0x02;
const int WM_SYSCOMMAND = 0x112;
const int SC_MAXMIZE = 0xF030;

switch (m.Msg)
{
case WM_NCHITTEST://鼠标点任意位置后可以拖动窗体
this.DefWndProc(ref m);
if (m.Result.ToInt32() == HTCLIENT)
{
m.Result = new IntPtr(HTCAPTION);
return;
}
break;
case WM_SYSCOMMAND://禁止最大化
if (m.WParam.ToInt32() ==SC_MAXMIZE)
{
/./代码
return;
}
break;
default:
base.WndProc(ref m);
break;
}
}
当去掉第二个case后，可以拖动窗体，但是双击窗体会最大化；加上第二个case想禁止最大化，但是加了后什么功能也不能实现，怎么回事

Answer 1

protected override void WndProc(ref Message m)
{
const int WM_NCHITTEST = 0x84;
const int HTCLIENT = 0x01;
const int HTCAPTION = 0x02;
const int WM_SYSCOMMAND = 0x112;
const int SC_MAXMIZE = 0xF030;
const int WM_NCLBUTTONDBLCLK = 0xA3;
switch (m.Msg)
{
case 0x4e:
case 0xd:
case 0xe:
case 0x14:
base.WndProc(ref m);
break;
case WM_NCHITTEST://鼠标点任意位置后可以拖动窗体

this.DefWndProc(ref m);
if (m.Result.ToInt32() == HTCLIENT)
{
m.Result = new IntPtr(HTCAPTION);
return;
}
break;
case WM_NCLBUTTONDBLCLK://禁止双击最大化
Console.WriteLine(this.WindowState);

return;

break;

default:

base.WndProc(ref m);
break;
}
}

Answer 2

用不到重写WndProc，你只需要为窗体添加MouseDown和MouseUp就可以了。

MouseDown捕获鼠标的位置，MouseUp停止捕获。

禁止最大化，你就重写OnMaximizedBoundsChanged

Answer 3

protected override void WndProc(ref Message m)
{
const int WM_NCHITTEST = 0x84;
const int HTCLIENT = 0x01;
const int HTCAPTION = 0x02;
const int WM_SYSCOMMAND = 0x112;
const int SC_MAXMIZE = 0xF030;
const int WM_NCLBUTTONDBLCLK = 0xA3;
switch (m.Msg)
{
case 0x4e:
case 0xd:
case 0xe:
case 0x14:
base.WndProc(ref m);
break;
case WM_NCHITTEST://鼠标点任意位置后可以拖动窗体

this.DefWndProc(ref m);
if (m.Result.ToInt32() == HTCLIENT)
{
m.Result = new IntPtr(HTCAPTION);
return;
}
break;
case WM_NCLBUTTONDBLCLK://禁止双击最大化
Console.WriteLine(this.WindowState);

return;

break;

default:

base.WndProc(ref m);
break;
}
}

Answer 4

用写这么多么？

6句话代码：
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

//在窗体的mousedown事件下加
ReleaseCapture();
SendMessage(this.Handle, 0x0112, 0xF010 + 0x0002, 0);

Answer 5

不知你是否是要求禁止最大化，是可在窗体属性MaximizeBox设置false