Winforms对话框不带图标的标题缩进

private void Form_Load(object sender, EventArgs e)
{
    // 设置标题文本的缩进
    int titleBarHeight = SystemInformation.CaptionHeight;
    int iconWidth = SystemInformation.SmallIconSize.Width;
    int indent = iconWidth + 5; // 根据实际需求调整缩进的大小
    IntPtr hTitleBar = GetSystemMenu(Handle, false);
    SetWindowLong(hTitleBar, GWL_STYLE, GetWindowLong(hTitleBar, GWL_STYLE) & ~WS_SYSMENU);
    SetWindowPos(Handle, IntPtr.Zero, 0, 0, Width, Height + titleBarHeight, SWP_NOMOVE | SWP_NOZORDER);
    SendMessage(Handle, WM_NCCALCSIZE, new IntPtr(1), IntPtr.Zero);
    RECT rect = new RECT();
    GetWindowRect(Handle, ref rect);
    rect.Top += titleBarHeight;
    MoveWindow(Handle, rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top, true);
    SetWindowPos(Handle, IntPtr.Zero, 0, 0, Width + indent, Height + titleBarHeight, SWP_NOMOVE | SWP_NOZORDER);
}