ElementCount is read-only
>>UnmanagedMarshal um = UnmanagedMarshal.DefineLPArray(typeof
(int));
>>um.ElementCount = count;
>>ParameterBuilder.SetMarshal(em);
Here is my code:
string baseName = "FooBarLib";
AssemblyName asmName = new AssemblyName();
asmName.Name = baseName;
//create a persistable dynamic persistable assembly
AssemblyBuilder asmbld =
AppDomain.CurrentDomain.DefineDynamicAssembly
(asmName,AssemblyBuilderAccess.Save);
//create a single module
string moduleName = baseName + ".dll";
ModuleBuilder module = asmbld.DefineDynamicModule
(moduleName,moduleName);
//create an interface definition for ITester
TypeBuilder typeBld = module.DefineType(asmName
+ ".ITester",TypeAttributes.Interface|TypeAttributes.Abstract
);
//add a single method definition:
// void SetArray( int count, [MarshalAs
(UnmanagedType.LPArray, SizeParamIndex=0)] int[] array);
Type[] paramTypes = { typeof(System.Int32), typeof
(System.Int32[]) };
Type returnType = typeof(void);
MethodAttributes mattr =
MethodAttributes.Abstract|MethodAttributes.NewSlot|MethodAttr
ibutes.HideBySig|
MethodAttributes.Virtual|MethodAttributes.Public;
MethodBuilder methodBld = typeBld.DefineMethod("SetArray",
mattr,
CallingConventions.HasThis|CallingConventions.Standar
d,
returnType,paramTypes);
methodBld.SetImplementationFlags
(MethodImplAttributes.InternalCall|MethodImplAttributes.Runti
me);
//add more info for the two parameters ( direction and param
names and marshal attribute)
ParameterBuilder paraBld = methodBld.DefineParameter
(1,ParameterAttributes.In,"count");
paraBld = methodBld.DefineParameter
(2,ParameterAttributes.In|ParameterAttributes.HasFieldMarshal
,"array");
paraBld.SetMarshal(UnmanagedMarshal.DefineLPArray
(UnmanagedType.LPArray));
//finalize the type
typeBld.CreateType();
//save the assembly to file system
asmbld.Save( moduleName );
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