/// <summary>
/// Generates an eventhandler for an event of type eventSignature that calls RegisterEvent on recorder
/// when invoked.
/// </summary>
public static Delegate GenerateHandler(Type eventSignature, IEventRecorder recorder)
{
Type returnType = GetDelegateReturnType(eventSignature);
Type[] parameters = GetDelegateParameterTypes(eventSignature);
var eventHandler = new DynamicMethod(
eventSignature.Name + "DynamicHandler",
returnType,
AppendParameterListThisReference(parameters),
recorder.GetType()
.Module);
MethodInfo methodToCall = typeof(IEventRecorder).GetMethod("RecordEvent",
BindingFlags.Instance | BindingFlags.Public);
ILGenerator ilGen = eventHandler.GetILGenerator();
// Make room for the one and only local variable in our function
ilGen.DeclareLocal(typeof(object[]));
// Create the object array for the parameters and store in local var index 0
ilGen.Emit(OpCodes.Ldc_I4, parameters.Length);
ilGen.Emit(OpCodes.Newarr, typeof(Object));
ilGen.Emit(OpCodes.Stloc_0);
for (var index = 0; index < parameters.Length; index++)
{
// Push the object array onto the evaluation stack
ilGen.Emit(OpCodes.Ldloc_0);
// Push the array index to store our parameter in onto the evaluation stack
ilGen.Emit(OpCodes.Ldc_I4, index);
// Load the parameter
ilGen.Emit(OpCodes.Ldarg, index + 1);
// Box value-type parameters
if (parameters[index]
.IsValueType)
{
ilGen.Emit(OpCodes.Box, parameters[index]);
}
// Store the parameter in the object array
ilGen.Emit(OpCodes.Stelem_Ref);
}
// Push the this-reference on the stack as param 0 for calling the handler
ilGen.Emit(OpCodes.Ldarg_0);
// Push the object array onto the stack as param 1 for calling the handler
ilGen.Emit(OpCodes.Ldloc_0);
// Call the handler
ilGen.EmitCall(OpCodes.Call, methodToCall, null);
ilGen.Emit(OpCodes.Ret);
return(eventHandler.CreateDelegate(eventSignature, recorder));
}
/// <summary>
/// Generates an eventhandler for an event of type eventSignature that calls RegisterEvent on recorder
/// when invoked.
/// </summary>
public static Delegate GenerateHandler(Type eventSignature, IEventRecorder recorder)
{
Type returnType = GetDelegateReturnType(eventSignature);
Type[] parameters = GetDelegateParameterTypes(eventSignature);
var eventHandler = new DynamicMethod(
eventSignature.Name + "DynamicHandler",
returnType,
AppendParameterListThisReference(parameters),
recorder.GetType()
.Module);
MethodInfo methodToCall = typeof (IEventRecorder).GetMethod("RecordEvent",
BindingFlags.Instance | BindingFlags.Public);
ILGenerator ilGen = eventHandler.GetILGenerator();
// Make room for the one and only local variable in our function
ilGen.DeclareLocal(typeof (object[]));
// Create the object array for the parameters and store in local var index 0
ilGen.Emit(OpCodes.Ldc_I4, parameters.Length);
ilGen.Emit(OpCodes.Newarr, typeof (Object));
ilGen.Emit(OpCodes.Stloc_0);
for (var index = 0; index < parameters.Length; index++)
{
// Push the object array onto the evaluation stack
ilGen.Emit(OpCodes.Ldloc_0);
// Push the array index to store our parameter in onto the evaluation stack
ilGen.Emit(OpCodes.Ldc_I4, index);
// Load the parameter
ilGen.Emit(OpCodes.Ldarg, index + 1);
// Box value-type parameters
if (parameters[index]
.IsValueType)
{
ilGen.Emit(OpCodes.Box, parameters[index]);
}
// Store the parameter in the object array
ilGen.Emit(OpCodes.Stelem_Ref);
}
// Push the this-reference on the stack as param 0 for calling the handler
ilGen.Emit(OpCodes.Ldarg_0);
// Push the object array onto the stack as param 1 for calling the handler
ilGen.Emit(OpCodes.Ldloc_0);
// Call the handler
ilGen.EmitCall(OpCodes.Call, methodToCall, null);
ilGen.Emit(OpCodes.Ret);
return eventHandler.CreateDelegate(eventSignature, recorder);
}
