Static void ctrl_MouseEnter(object sender, EventArgs e) Internal static void SetCtrlTooltip(Control ctrl, string text)Ĭtrl.MouseEnter += new EventHandler(ctrl_MouseEnter) / Sets tooltip to control for help user Force the ToolTip text to be displayed whether If (mInt407Count > 3) // if this occurs we need to release. / /// protected override void WndProc( ref Message m) / sure the work gets done on the Main GUI thread. / this WndProc is called on a separate thread. / otherwise, we could get a cross threading type exception, since / error provider however, I can't do it directly in the WndProc On the 0x407 message, we need to reset the / public class ErrorProviderNativeWindowHook : NativeWindow
Errorprovider Patch#
/ and patch up the ErrorProvider/ToolTip bug.
/ /// A NativeWindow, which we use to trap the WndProc messages / /// the object instance /// the name of the field, which we want to get /// the value of the private field private object GetFieldValue( object instance, string name) / /// A helper method, which allows us to get the value of private fields. If (nativeWindow != null & hook.Handle = IntPtr.Zero)įoreach (ErrorProviderNativeWindowHook hook NativeWindow nativeWindow = GetFieldValue(hashRes, Hook = new ErrorProviderNativeWindowHook() (Hashtable)GetFieldValue(mTheErrorProvider, " windows") ĮrrorProviderNativeWindowHook hook = null If (mTheErrorProvider.ContainerControl = null) / /// /// void tmr_CheckHandels( object sender, EventArgs e) / /// If there is some sort of change, it also calls the RefreshProviderErrors, / changed and if it updates this Native window with the new handle. / /// This method checks to see if the error provider's tooltip window has MTheErrorProvider.SetError(control, str) MTheErrorProvider.SetError(control, " ") MTheErrorProvider.BlinkStyle = ErrorBlinkStyle.NeverBlink String str = mTheErrorProvider.GetError(control) ĮrrorBlinkStyle prev = mTheErrorProvider.BlinkStyle MTheErrorProvider.GetError(control).Length > 0) If (mTheErrorProvider.GetError(control) != null & If (!( bool)GetFieldValue(hashRes, " toolTipShown")) Hashtable hashRes = (Hashtable)GetFieldValue(mTheErrorProvider, " items") įoreach (Control control in hashRes.Keys) / Email me at: private void RefreshProviderErrors() / /// Todo: I would like to find an easier way to fix this. / if the user is able to hover over another error provider message for / you click on an error provider, while its tooltip is displayed, / /// Resets the error provider, error messages. MTmrCheckHandelsProc.Tick += new EventHandler(tmr_CheckHandels) / /// public ErrorProviderFixManager(ErrorProvider ep)
/ /// To do: I would like to do this without a timer (Suggestions welcome). / keep the errorProviders tooltip window up-to-date and enabled. / /// constructor, which will started a timer that will Private Hashtable mHashOfNativeWindows = new Hashtable() Private Timer mTmrCheckHandelsProc = null Private ErrorProvider mTheErrorProvider = null
Public class ErrorProviderFixManager : IDisposable Protected override void Dispose( bool disposing) Public ErrorProviderFixed(IContainer container) Public ErrorProviderFixed(ContainerControl parentControl) MToolTipFix = new ErrorProviderFixManager( this)
Errorprovider code#
ErrorProviderFixed CodeĬopy Code public class ErrorProviderFixed : ErrorProviderĮrrorProviderFixManager mToolTipFix = null Then, replace all instances of with ErrorProviderFixed. To replace the Microsoft ErrorProvider with ErrorProviderFixed, all you need to do is include the following code in your project in a file such as ErrorProviderFixed.cs. I would much prefer it if Microsoft could fix this bug. Note: “*the trick” as explained above re-enables the messages so that they display, but causes a slight flicker. When we need to, we reset the error provider messages (re: *the trick).
Errorprovider windows#
It looks at the ErrorProvider’s private member Windows and registers it with our own NativeWindow implementation, allowing us monitor its WinProc messages. The ErrorProviderFixed implementation, which follows, is a simple extension of the ErrorProvider. I have discovered that setting a control's error message to "" and then resetting it, will allow the error message to be re-displayed ( the trick*). When you move the mouse off the error provider icon and return it will not re-appear. Next, click the mouse and the error message goes away. When you hover over the Microsoft error provider, the error message is displayed.
Errorprovider download#
To better understand the problem, run the demo app included as a download to this post.
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