private static DialogResult ShowCore(IWin32Window owner, string text, string caption,
MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton,
MessageBoxOptions options, bool showHelp)
{
if (!ClientUtils.IsEnumValid(buttons, (int)buttons, (int)MessageBoxButtons.OK, (int)MessageBoxButtons.RetryCancel))
{
throw new InvalidEnumArgumentException("buttons", (int)buttons, typeof(MessageBoxButtons));
}
// valid values are 0x0 0x10 0x20 0x30 0x40, chop off the last 4 bits and check that it's between 0 and 4.
if (!WindowsFormsUtils.EnumValidator.IsEnumWithinShiftedRange(icon, /*numBitsToShift*/ 4, /*min*/ 0x0, /*max*/ 0x4))
{
throw new InvalidEnumArgumentException("icon", (int)icon, typeof(MessageBoxIcon));
}
// valid values are 0x0 0x100, 0x200, chop off the last 8 bits and check that it's between 0 and 2.
if (!WindowsFormsUtils.EnumValidator.IsEnumWithinShiftedRange(defaultButton, /*numBitsToShift*/ 8, /*min*/ 0x0, /*max*/ 0x2))
{
throw new InvalidEnumArgumentException("defaultButton", (int)defaultButton, typeof(DialogResult));
}
// options intentionally not verified because we don't expose all the options Win32 supports.
if (!SystemInformation.UserInteractive && (options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) == 0)
{
throw new InvalidOperationException(SR.GetString(SR.CantShowModalOnNonInteractive));
}
if (owner != null && (options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) != 0)
{
throw new ArgumentException(SR.GetString(SR.CantShowMBServiceWithOwner), "options");
}
if (showHelp && (options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) != 0)
{
throw new ArgumentException(SR.GetString(SR.CantShowMBServiceWithHelp), "options");
}
// demand if not safe known options.
if ((options & ~(MessageBoxOptions.RightAlign | MessageBoxOptions.RtlReading)) != 0)
{
// See DDB#163043.
IntSecurity.UnmanagedCode.Demand();
}
IntSecurity.SafeSubWindows.Demand();
int style = (showHelp) ? HELP_BUTTON : 0;
style |= (int)buttons | (int)icon | (int)defaultButton | (int)options;
IntPtr handle = IntPtr.Zero;
if (showHelp || ((options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) == 0))
{
if (owner == null)
{
handle = UnsafeNativeMethods.GetActiveWindow();
}
else
{
handle = Control.GetSafeHandle(owner);
}
}
IntPtr userCookie = IntPtr.Zero;
if (Application.UseVisualStyles)
{
// CLR4.0 or later, shell32.dll needs to be loaded explicitly.
if (UnsafeNativeMethods.GetModuleHandle(ExternDll.Shell32) == IntPtr.Zero)
{
if (UnsafeNativeMethods.LoadLibrary(ExternDll.Shell32) == IntPtr.Zero)
{
int lastWin32Error = Marshal.GetLastWin32Error();
throw new Win32Exception(lastWin32Error, SR.GetString(SR.LoadDLLError, ExternDll.Shell32));
}
}
// Activate theming scope to get theming for controls at design time and when hosted in browser.
// NOTE: If a theming context is already active, this call is very fast, so shouldn't be a perf issue.
userCookie = UnsafeNativeMethods.ThemingScope.Activate();
}
Application.BeginModalMessageLoop();
DialogResult result;
try {
result = Win32ToDialogResult(SafeNativeMethods.MessageBox(new HandleRef(owner, handle), text, caption, style));
}
finally {
Application.EndModalMessageLoop();
UnsafeNativeMethods.ThemingScope.Deactivate(userCookie);
}
// Right after the dialog box is closed, Windows sends WM_SETFOCUS back to the previously active control
// but since we have disabled this thread main window the message is lost. So we have to send it again after
// we enable the main window.
//
UnsafeNativeMethods.SendMessage(new HandleRef(owner, handle), NativeMethods.WM_SETFOCUS, 0, 0);
return(result);
}
private static DialogResult ShowCore(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options, bool showHelp)
{
DialogResult result;
if (!System.Windows.Forms.ClientUtils.IsEnumValid(buttons, (int)buttons, 0, 5))
{
throw new InvalidEnumArgumentException("buttons", (int)buttons, typeof(MessageBoxButtons));
}
if (!WindowsFormsUtils.EnumValidator.IsEnumWithinShiftedRange(icon, 4, 0, 4))
{
throw new InvalidEnumArgumentException("icon", (int)icon, typeof(MessageBoxIcon));
}
if (!WindowsFormsUtils.EnumValidator.IsEnumWithinShiftedRange(defaultButton, 8, 0, 2))
{
throw new InvalidEnumArgumentException("defaultButton", (int)defaultButton, typeof(DialogResult));
}
if (!SystemInformation.UserInteractive && ((options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) == 0))
{
throw new InvalidOperationException(System.Windows.Forms.SR.GetString("CantShowModalOnNonInteractive"));
}
if ((owner != null) && ((options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) != 0))
{
throw new ArgumentException(System.Windows.Forms.SR.GetString("CantShowMBServiceWithOwner"), "options");
}
if (showHelp && ((options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) != 0))
{
throw new ArgumentException(System.Windows.Forms.SR.GetString("CantShowMBServiceWithHelp"), "options");
}
if ((options & ~(MessageBoxOptions.RtlReading | MessageBoxOptions.RightAlign)) != 0)
{
System.Windows.Forms.IntSecurity.UnmanagedCode.Demand();
}
System.Windows.Forms.IntSecurity.SafeSubWindows.Demand();
int type = showHelp ? 0x4000 : 0;
type |= ((buttons | ((MessageBoxButtons)((int)icon))) | ((MessageBoxButtons)((int)defaultButton))) | ((MessageBoxButtons)((int)options));
IntPtr zero = IntPtr.Zero;
if (showHelp || ((options & (MessageBoxOptions.ServiceNotification | MessageBoxOptions.DefaultDesktopOnly)) == 0))
{
if (owner == null)
{
zero = UnsafeNativeMethods.GetActiveWindow();
}
else
{
zero = Control.GetSafeHandle(owner);
}
}
IntPtr userCookie = IntPtr.Zero;
if (Application.UseVisualStyles)
{
if ((UnsafeNativeMethods.GetModuleHandle("shell32.dll") == IntPtr.Zero) && (UnsafeNativeMethods.LoadLibrary("shell32.dll") == IntPtr.Zero))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), System.Windows.Forms.SR.GetString("LoadDLLError", new object[] { "shell32.dll" }));
}
userCookie = UnsafeNativeMethods.ThemingScope.Activate();
}
Application.BeginModalMessageLoop();
try
{
result = Win32ToDialogResult(SafeNativeMethods.MessageBox(new HandleRef(owner, zero), text, caption, type));
}
finally
{
Application.EndModalMessageLoop();
UnsafeNativeMethods.ThemingScope.Deactivate(userCookie);
}
UnsafeNativeMethods.SendMessage(new HandleRef(owner, zero), 7, 0, 0);
return(result);
}