public static Func <object, T> CreateGetter <T>(FieldInfo field)
{
DynamicMethod dm = new DynamicMethod(string.Format("Get_{0}.{1}", field.DeclaringType.FullName, field.Name),
typeof(T), new Type[] { typeof(object) }, field.DeclaringType, true);
ILGenerator il = dm.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
if (field.DeclaringType.IsValueType)
{
il.Emit(OpCodes.Unbox_Any, field.DeclaringType);
}
il.Emit(OpCodes.Ldfld, field);
if (field.FieldType != typeof(T))
{
if (!typeof(T).IsAssignableFrom(field.FieldType))
{
TypeCode code = Type.GetTypeCode(typeof(T));
if (code == TypeCode.Boolean)
{
switch (Type.GetTypeCode(field.FieldType))
{
case TypeCode.UInt64:
case TypeCode.Int64:
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Conv_I8);
break;
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
il.Emit(OpCodes.Ldc_I4_0);
break;
default:
throw new ArgumentException();
}
il.Emit(OpCodes.Ceq);
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Ceq);
}
else
{
OpCode op = code.ConvertFrom(Type.GetTypeCode(field.FieldType));
if (op == OpCodes.Throw)
{
throw new ArgumentException();
}
if (op != OpCodes.Nop)
{
il.Emit(op);
}
}
}
}
il.Emit(OpCodes.Ret);
return((Func <object, T>)dm.CreateDelegate(typeof(Func <object, T>)));
}
public static Action <object, T> CreateSetter <T>(PropertyInfo property)
{
MethodInfo method = property.GetSetMethod(true);
DynamicMethod dm = new DynamicMethod(string.Format("Set_{0}.{1}", property.DeclaringType.FullName, property.Name),
typeof(void), new Type[] { typeof(object), typeof(T) }, property.DeclaringType, true);
ILGenerator il = dm.GetILGenerator();
if (!property.DeclaringType.IsValueType)
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_1);
if (property.PropertyType != typeof(T))
{
if (!property.PropertyType.IsAssignableFrom(typeof(T)))
{
TypeCode code = Type.GetTypeCode(property.PropertyType);
if (code == TypeCode.Boolean)
{
switch (Type.GetTypeCode(property.PropertyType))
{
case TypeCode.UInt64:
case TypeCode.Int64:
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Conv_I8);
break;
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
il.Emit(OpCodes.Ldc_I4_0);
break;
default:
throw new ArgumentException();
}
il.Emit(OpCodes.Ceq);
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Ceq);
}
else
{
OpCode op = code.ConvertFrom(Type.GetTypeCode(typeof(T)));
if (op == OpCodes.Throw)
{
throw new ArgumentException();
}
if (op != OpCodes.Nop)
{
il.Emit(op);
}
}
}
}
il.Emit(OpCodes.Call, method);
}
il.Emit(OpCodes.Ret);
return((Action <object, T>)dm.CreateDelegate(typeof(Action <object, T>)));
}
