public static FieldInfo GetField (Type type, FieldInfo field)
{
if (!type.IsGenericType)
throw new ArgumentException ("Type is not a generic type", "type");
if (type.IsGenericTypeDefinition)
throw new ArgumentException ("Type cannot be a generic type definition", "type");
if (field is FieldOnTypeBuilderInst)
throw new ArgumentException ("The specified field must be declared on a generic type definition.", "field");
if (field.DeclaringType != type.GetGenericTypeDefinition ())
throw new ArgumentException ("field declaring type is not the generic type definition of type", "method");
FieldInfo res = type.GetField (field);
if (res == null)
throw new System.Exception ("field not found");
else
return res;
}