Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Threading / ExceptionWrapper.cs / 1305600 / ExceptionWrapper.cs
// //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // //---------------------------------------------------------------------------- using Microsoft.Win32; // Registry & ComponentDispatcher & MSG using System.Security; // CAS using System.Security.Permissions; // Registry permissions using System.Runtime.InteropServices; // SEHException using System.Diagnostics; // Debug & Debugger using System.Threading; using MS.Internal.Threading; // ExceptionFilterHelper using MS.Internal.WindowsBase; namespace System.Windows.Threading { ////// Class for Filtering and Catching Exceptions /// internal class ExceptionWrapper { internal ExceptionWrapper() { _exceptionFilterHelper = new ExceptionFilterHelper( new InternalRealCallDelegate(InternalRealCall), new FilterExceptionDelegate(FilterException), new CatchExceptionDelegate(CatchException) ); } // Helper for exception filtering: // The real impl is in Base\MS\Internal\Threading\ExceptionFilterHelper.vb public object TryCatchWhen(object source, Delegate callback, object args, int numArgs, Delegate catchHandler) { return _exceptionFilterHelper.TryCatchWhen(source, callback, args, numArgs, catchHandler); // object result = null; // try // { // result = InternalRealCall(callback, args, numArgs); // } // catch(Exception e) WHEN FilterException( Exception e ); // { // if (e is NullReferenceException || e is SEHException) // throw; // else // if( ! CatchException(source, e) ) // throw; // } // return result; } private object InternalRealCall(Delegate callback, object args, int numArgs) { object result = null; Debug.Assert(numArgs == 0 || // old API, no args numArgs == 1 || // old API, 1 arg, the args param is it numArgs == -1); // new API, any number of args, the args param is an array of them // Support the fast-path for certain 0-param and 1-param delegates, even // of an arbitrary "params object[]" is passed. int numArgsEx = numArgs; object singleArg = args; if(numArgs == -1) { object[] argsArr = (object[])args; if (argsArr == null || argsArr.Length == 0) { numArgsEx = 0; } else if(argsArr.Length == 1) { numArgsEx = 1; singleArg = argsArr[0]; } } // Special-case delegates that we know about to avoid the // expensive DynamicInvoke call. if(numArgsEx == 0) { Action action = callback as Action; if (action != null) { action(); } else { Dispatcher.ShutdownCallback shutdownCallback = callback as Dispatcher.ShutdownCallback; if(shutdownCallback != null) { shutdownCallback(); } else { // The delegate could return anything. result = callback.DynamicInvoke(); } } } else if(numArgsEx == 1) { DispatcherOperationCallback dispatcherOperationCallback = callback as DispatcherOperationCallback; if(dispatcherOperationCallback != null) { result = dispatcherOperationCallback(singleArg); } else { SendOrPostCallback sendOrPostCallback = callback as SendOrPostCallback; if(sendOrPostCallback != null) { sendOrPostCallback(singleArg); } else { if(numArgs == -1) { // Explicitly pass an object[] to DynamicInvoke so that // it will not try to wrap the arg in another object[]. result = callback.DynamicInvoke((object[])args); } else { // By pass the args parameter as a single object, // DynamicInvoke will wrap it in an object[] due to the // params keyword. result = callback.DynamicInvoke(args); } } } } else { // Explicitly pass an object[] to DynamicInvoke so that // it will not try to wrap the arg in another object[]. result = callback.DynamicInvoke((object[])args); } return result; } private bool FilterException(object source, Exception e) { // If we have a Catch handler we should catch the exception // unless the Filter handler says we shouldn't. bool shouldCatch = (null != Catch); if(null != Filter) { shouldCatch = Filter(source, e); } return shouldCatch; } // This returns false when caller should rethrow the exception. // true means Exception is "handled" and things just continue on. private bool CatchException(object source, Exception e, Delegate catchHandler) { if (catchHandler != null) { if(catchHandler is DispatcherOperationCallback) { ((DispatcherOperationCallback)catchHandler)(null); } else { catchHandler.DynamicInvoke(null); } } if(null != Catch) return Catch(source, e); return false; } ////// Exception Catch Handler Delegate /// Returns true if the exception is "handled" /// Returns false if the caller should rethow the exception. /// public delegate bool CatchHandler(object source, Exception e); ////// Exception Catch Handler /// Returns true if the exception is "handled" /// Returns false if the caller should rethow the exception. /// public event CatchHandler Catch; public delegate bool FilterHandler(object source, Exception e); public event FilterHandler Filter; private ExceptionFilterHelper _exceptionFilterHelper; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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