12

我正在使用System.Reflection.Emit. 在某一时刻，原始对象可能在访问 ( FaultException) 时抛出错误，并且我已经实现的 my 应该捕获该错误try { } catch (Exception e) { }，但事实并非如此。

代码由ILSpy 正确显示。

try
{
    if (original.Station != null)
    {
        if (objectDictionary.ContainsKey(original.Station))
        {
            this.Station = (objectDictionary[original.Station] as StationWrapper);
        }
        else
        {
            this.Station = new StationWrapper(original.Station, objectDictionary);
        }
    }
}
catch (Exception arg_6D_0)
{
    ReportManager.Log(arg_6D_0);
}

代码生成

这是程序集生成的代码。

Label ex = il.BeginExceptionBlock();
....
// Exception block end
il.Emit(OpCodes.Leave, ex);
il.BeginCatchBlock(typeof(Exception));
il.Emit(OpCodes.Call, ReportManager_Log);
il.EndExceptionBlock();

编辑

异常被用户代码而不是 IL 代码捕获。

拆卸

在这里删除了客户的一些命名空间。写入行已在最后几分钟添加。

.try
{
    IL_0019: ldarg.1
    IL_001a: call instance class [...]...Station [...]...StationBase::get_Station()
    IL_001f: brfalse IL_0063

    IL_0024: ldarg.2
    IL_0025: ldarg.1
    IL_0026: call instance class [...]...Station [...]...StationBase::get_Station()
    IL_002b: call instance bool class [mscorlib]System.Collections.Generic.Dictionary`2<object, object>::ContainsKey(!0)
    IL_0030: brfalse IL_0051

    IL_0035: ldarg.0
    IL_0036: ldarg.2
    IL_0037: ldarg.1
    IL_0038: call instance class [...]...Station [...]...StationBase::get_Station()
    IL_003d: call instance !1 class [mscorlib]System.Collections.Generic.Dictionary`2<object, object>::get_Item(!0)
    IL_0042: isinst ...StationWrapper
    IL_0047: call instance void ...StationBaseWrapper::set_Station(class ...StationWrapper)
    IL_004c: br IL_0063

    IL_0051: ldarg.0
    IL_0052: ldarg.1
    IL_0053: call instance class [...]...Station [...]...StationBase::get_Station()
    IL_0058: ldarg.2
    IL_0059: newobj instance void ....StationWrapper::.ctor(class [...]...Station, class [mscorlib]System.Collections.Generic.Dictionary`2<object, object>)
    IL_005e: call instance void ...StationBaseWrapper::set_Station(class ...StationWrapper)

    IL_0063: leave IL_007c
} // end .try
catch [mscorlib]System.Exception
{
    IL_0068: ldstr "Its comming home"
    IL_006d: call void [mscorlib]System.Console::WriteLine(string)
    IL_0072: call void [...Report]...ReportManager::Log(class [mscorlib]System.Exception)
    IL_0077: leave IL_007c
} // end handler

编辑 2

System.Exception在 IL 代码中抛出 a时，在FaultException'1可能发生之前，会处理异常。用Exception和测试ArgumentException。

4

2 回答 2

6

在这里一切正常；你确定它不是嵌套异常块吗？

例子：

using System;
using System.Reflection.Emit;

public class Test
{
    static void Main()
    {
        var dm = new DynamicMethod("foo", null, new[] {typeof(bool)});
        var il = dm.GetILGenerator();

        Label ex = il.BeginExceptionBlock();
        il.Emit(OpCodes.Ldarg_0);
        il.EmitCall(OpCodes.Call, typeof(Test).GetMethod("Throw"), null);
        il.Emit(OpCodes.Leave, ex);

        il.BeginCatchBlock(typeof(Exception));
        il.EmitCall(OpCodes.Call, typeof(Test).GetMethod("Log"), null);
        il.EndExceptionBlock();
        il.Emit(OpCodes.Ldstr, "done");
        il.EmitCall(OpCodes.Call, typeof(Console).GetMethod("WriteLine",
                      new[] {typeof(string)}), null);

        il.Emit(OpCodes.Ret);
        var act = (Action<bool>)dm.CreateDelegate(typeof (Action<bool>));
        Console.WriteLine("Expect success:");
        act(false);
        Console.WriteLine("Expect fail:");
        act(true);
        Console.WriteLine("(all done)");
    }
    public static void Throw(bool fatal)
    {
        if(fatal) throw new InvalidOperationException("Boom!");
    }
    public static void Log(Exception ex)
    {
        Console.WriteLine("Error: " + ex.Message);
    }
}
于 2012-02-21T10:01:51.503 回答
0

这实际上似乎是 Visual-Studio 2010 的错误。VS 中的所有异常在被捕获时都会被忽略，但 VS 无论如何都会显示异常。

并非所有异常都被忽略，这似乎取决于引发异常的代码。生成的异常（通过 Emit ）被忽略，来自外部 DLL 的异常不会被忽略。

于 2012-05-10T10:07:24.547 回答