public static Expression CreateKeyConversionExpression(
Expression source,
MemberInfo[] toMembers,
int[] mapping,
IKeyInfoHelper from,
IKeyInfoHelper to)
{
int memberCount = mapping.Length;
Expression[] factoryArgs = new Expression[memberCount];
for (int i = 0; i < memberCount; i++)
{
Type requestedType = ReflectionHelper.GetMemberType(toMembers[i]);
Expression arg = from.CreateKeyMemberSelectorExpression(source, mapping[i]);
if (arg.Type != requestedType)
{
arg = Expression.Convert(arg, requestedType);
}
factoryArgs[i] = arg;
}
return(to.CreateKeyFactoryExpression(factoryArgs));
}
public static Expression CreateKeySelector(
Expression source,
MemberInfo[] entityMembers,
IKeyInfoHelper helper)
{
Expression[] memberAccess = new Expression[entityMembers.Length];
for (int i = 0; i < entityMembers.Length; i++)
{
memberAccess[i] = Expression.MakeMemberAccess(source, entityMembers[i]);
}
Expression body = helper.CreateKeyFactoryExpression(memberAccess);
return(body);
}