private void GenerateMethod(Type interfaceType, FieldBuilder handlerField, TypeBuilder typeBuilder)
{
MetaDataFactory.Add(interfaceType);
MethodInfo[] interfaceMethods = interfaceType.GetMethods();
PropertyInfo[] props = interfaceType.GetProperties();
for (int i = 0; i < interfaceMethods.Length; i++)
{
MethodInfo methodInfo = interfaceMethods[i];
// Get the method parameters since we need to create an array
// of parameter types
ParameterInfo[] methodParams = methodInfo.GetParameters();
int numOfParams = methodParams.Length;
Type[] methodParameters = new Type[numOfParams];
// convert the ParameterInfo objects into Type
for (int j = 0; j < numOfParams; j++)
{
methodParameters[j] = methodParams[j].ParameterType;
}
// create a new builder for the method in the interface
MethodBuilder methodBuilder = typeBuilder.DefineMethod(
methodInfo.Name,
/*MethodAttributes.Public | MethodAttributes.Virtual | */ methodInfo.Attributes & ~MethodAttributes.Abstract,
CallingConventions.Standard,
methodInfo.ReturnType, methodParameters);
#region ( "Handler Method IL Code" )
ILGenerator methodIL = methodBuilder.GetILGenerator();
// load "this"
methodIL.Emit(OpCodes.Ldarg_0);
// load the handler
methodIL.Emit(OpCodes.Ldfld, handlerField);
// load "this" since its needed for the call to invoke
methodIL.Emit(OpCodes.Ldarg_0);
// load the name of the interface, used to get the MethodInfo object
// from MetaDataFactory
methodIL.Emit(OpCodes.Ldstr, interfaceType.FullName);
// load the index, used to get the MethodInfo object
// from MetaDataFactory
methodIL.Emit(OpCodes.Ldc_I4, i);
// invoke GetMethod in MetaDataFactory
methodIL.Emit(OpCodes.Call, GET_METHODINFO_METHOD);
// load the number of parameters onto the stack
methodIL.Emit(OpCodes.Ldc_I4, numOfParams);
// create a new array, using the size that was just pused on the stack
methodIL.Emit(OpCodes.Newarr, typeof(object));
// if we have any parameters, then iterate through and set the values
// of each element to the corresponding arguments
for (int j = 0; j < numOfParams; j++)
{
methodIL.Emit(OpCodes.Dup); // this copies the array
methodIL.Emit(OpCodes.Ldc_I4, j);
methodIL.Emit(OpCodes.Ldarg, j + 1);
if (methodParameters[j].IsValueType)
{
methodIL.Emit(OpCodes.Box, methodParameters[j]);
}
methodIL.Emit(OpCodes.Stelem_Ref);
}
// call the Invoke method
methodIL.Emit(OpCodes.Callvirt, INVOKE_METHOD);
if (methodInfo.ReturnType != typeof(void))
{
// if the return type if a value type, then unbox the return value
// so that we don't get junk.
if (methodInfo.ReturnType.IsValueType)
{
methodIL.Emit(OpCodes.Unbox, methodInfo.ReturnType);
if (methodInfo.ReturnType.IsEnum)
{
methodIL.Emit(OpCodes.Ldind_I4);
}
else if (!methodInfo.ReturnType.IsPrimitive)
{
methodIL.Emit(OpCodes.Ldobj, methodInfo.ReturnType);
}
else
{
methodIL.Emit((OpCode)OpCodeTypeMapper[methodInfo.ReturnType]);
}
}
}
else
{
// pop the return value that Invoke returned from the stack since
// the method's return type is void.
methodIL.Emit(OpCodes.Pop);
}
// Return
methodIL.Emit(OpCodes.Ret);
#endregion
}
//for (int i = 0; i < props.Length; i++)
//{
// PropertyInfo p = props[i];
// PropertyBuilder pb = typeBuilder.DefineProperty(p.Name, p.Attributes, p.PropertyType, new Type[] { p.PropertyType });
// pb.SetGetMethod((MethodBuilder)methodTable[p.GetGetMethod()]);
// pb.SetSetMethod((MethodBuilder)methodTable[p.GetSetMethod()]);
//}
// Iterate through the parent interfaces and recursively call this method
foreach (Type parentType in interfaceType.GetInterfaces())
{
GenerateMethod(parentType, handlerField, typeBuilder);
}
}
private void GenerateMethod(Type interfaceType, FieldBuilder handlerField, TypeBuilder typeBuilder)
{
MetaDataFactory.Add(interfaceType);
MethodInfo[] interfaceMethods = interfaceType.GetMethods();
if (interfaceMethods != null)
{
for (int i = 0; i < interfaceMethods.Length; i++)
{
MethodInfo methodInfo = interfaceMethods[i];
// Get the method parameters since we need to create an array
// of parameter types
ParameterInfo[] methodParams = methodInfo.GetParameters();
int numOfParams = methodParams.Length;
Type[] methodParameters = new Type[numOfParams];
// convert the ParameterInfo objects into Type
for (int j = 0; j < numOfParams; j++)
{
methodParameters[j] = methodParams[j].ParameterType;
}
// create a new builder for the method in the interface
MethodBuilder methodBuilder = typeBuilder.DefineMethod(
methodInfo.Name,
MethodAttributes.Public | MethodAttributes.Virtual,
CallingConventions.Standard,
methodInfo.ReturnType, methodParameters);
#region ( "Handler Method IL Code" )
ILGenerator methodIL = methodBuilder.GetILGenerator();
// Emit a declaration of a local variable if there is a return
// type defined
if (!methodInfo.ReturnType.Equals(typeof(void)))
{
methodIL.DeclareLocal(methodInfo.ReturnType);
if (methodInfo.ReturnType.IsValueType && !methodInfo.ReturnType.IsPrimitive)
{
methodIL.DeclareLocal(methodInfo.ReturnType);
}
}
// if we have any parameters for the method, then declare an
// Object array local var.
if (numOfParams > 0)
{
methodIL.DeclareLocal(typeof(System.Object[]));
}
// declare a label for invoking the handler
Label handlerLabel = methodIL.DefineLabel();
// declare a lable for returning from the mething
Label returnLabel = methodIL.DefineLabel();
// load "this"
methodIL.Emit(OpCodes.Ldarg_0);
// load the handler instance variable
methodIL.Emit(OpCodes.Ldfld, handlerField);
// jump to the handlerLabel if the handler instance variable is not null
methodIL.Emit(OpCodes.Brtrue_S, handlerLabel);
// the handler is null, so return null if the return type of
// the method is not void, otherwise return nothing
if (!methodInfo.ReturnType.Equals(typeof(void)))
{
if (methodInfo.ReturnType.IsValueType && !methodInfo.ReturnType.IsPrimitive && !methodInfo.ReturnType.IsEnum)
{
methodIL.Emit(OpCodes.Ldloc_1);
}
else
{
// load null onto the stack
methodIL.Emit(OpCodes.Ldnull);
}
// store the null return value
methodIL.Emit(OpCodes.Stloc_0);
// jump to return
methodIL.Emit(OpCodes.Br_S, returnLabel);
}
// the handler is not null, so continue with execution
methodIL.MarkLabel(handlerLabel);
// load "this"
methodIL.Emit(OpCodes.Ldarg_0);
// load the handler
methodIL.Emit(OpCodes.Ldfld, handlerField);
// load "this" since its needed for the call to invoke
methodIL.Emit(OpCodes.Ldarg_0);
// load the name of the interface, used to get the MethodInfo object
// from MetaDataFactory
methodIL.Emit(OpCodes.Ldstr, interfaceType.FullName);
// load the index, used to get the MethodInfo object
// from MetaDataFactory
methodIL.Emit(OpCodes.Ldc_I4, i);
// invoke GetMethod in MetaDataFactory
methodIL.Emit(OpCodes.Call,
typeof(DynamicProxy.MetaDataFactory).GetMethod(
"GetMethod", new Type[] { typeof(string), typeof(int) }));
// load the number of parameters onto the stack
methodIL.Emit(OpCodes.Ldc_I4, numOfParams);
// create a new array, using the size that was just pused on the stack
methodIL.Emit(OpCodes.Newarr, typeof(System.Object));
// if we have any parameters, then iterate through and set the values
// of each element to the corresponding arguments
if (numOfParams > 0)
{
methodIL.Emit(OpCodes.Stloc_1);
for (int j = 0; j < numOfParams; j++)
{
methodIL.Emit(OpCodes.Ldloc_1);
methodIL.Emit(OpCodes.Ldc_I4, j);
methodIL.Emit(OpCodes.Ldarg, j + 1);
if (methodParameters[j].IsValueType)
{
methodIL.Emit(OpCodes.Box, methodParameters[j]);
}
methodIL.Emit(OpCodes.Stelem_Ref);
}
methodIL.Emit(OpCodes.Ldloc_1);
}
// call the Invoke method
methodIL.Emit(OpCodes.Callvirt,
typeof(DynamicProxy.IProxyInvocationHandler).GetMethod("Invoke"));
if (!methodInfo.ReturnType.Equals(typeof(void)))
{
// if the return type if a value type, then unbox the return value
// so that we don't get junk.
if (methodInfo.ReturnType.IsValueType)
{
methodIL.Emit(OpCodes.Unbox, methodInfo.ReturnType);
if (methodInfo.ReturnType.IsEnum)
{
methodIL.Emit(OpCodes.Ldind_I4);
}
else if (!methodInfo.ReturnType.IsPrimitive)
{
methodIL.Emit(OpCodes.Ldobj, methodInfo.ReturnType);
}
else
{
methodIL.Emit((OpCode)opCodeTypeMapper[methodInfo.ReturnType]);
}
}
// store the result
methodIL.Emit(OpCodes.Stloc_0);
// jump to the return statement
methodIL.Emit(OpCodes.Br_S, returnLabel);
// mark the return statement
methodIL.MarkLabel(returnLabel);
// load the value stored before we return. This will either be
// null (if the handler was null) or the return value from Invoke
methodIL.Emit(OpCodes.Ldloc_0);
}
else
{
// pop the return value that Invoke returned from the stack since
// the method's return type is void.
methodIL.Emit(OpCodes.Pop);
//mark the return statement
methodIL.MarkLabel(returnLabel);
}
// Return
methodIL.Emit(OpCodes.Ret);
#endregion
}
}
// Iterate through the parent interfaces and recursively call this method
foreach (Type parentType in interfaceType.GetInterfaces())
{
GenerateMethod(parentType, handlerField, typeBuilder);
}
}
