private Expression <Func <TUserRole, TValue> > GetUserRoleLambda <TValue>(Mapper.UserRoleColumnType columnType)
{
var param = Expression.Parameter(UserRoleType, "p");
var memberAccess = UserRoleHelper.GetMemberAccess(param, columnType);
return(Expression.Lambda <Func <TUserRole, TValue> >(memberAccess, param));
}
private Expression <Func <TUserRole, bool> > GetUserRoleLambda(Mapper.UserRoleColumnType columnType, object value)
{
var param = Expression.Parameter(UserRoleType, "p");
var memberAccess = UserRoleHelper.GetMemberAccess(param, columnType);
var content = Expression.Constant(value);
var equal = Expression.Equal(memberAccess, content);
return(Expression.Lambda <Func <TUserRole, bool> >(equal, param));
}
private Expression <Func <TUserRole, bool> > GetContainsJoinLambda(IEnumerable <TUserRole> Joins, bool Not)
{
var param = Expression.Parameter(UserRoleType, "p");
if (Joins.Count() < 1)
{
return(Expression.Lambda <Func <TUserRole, bool> >(Expression.Constant(true), param));
}
var memberAccess1 = UserRoleHelper.GetMemberAccess(param, Mapper.UserRoleColumnType.RoleID);
var memberAccess2 = UserRoleHelper.GetMemberAccess(param, Mapper.UserRoleColumnType.UserID);
var allEquals = Joins.Select(s => Expression.And(Expression.Equal(memberAccess1, Expression.Constant(Provider.UserRoleMapper.RoleID(s))),
Expression.Equal(memberAccess2, Expression.Constant(Provider.UserRoleMapper.UserID(s)))));
Expression all = allEquals.Aggregate((o, n) => Expression.Or(o, n));
if (Not)
{
all = Expression.Not(all);
}
return(Expression.Lambda <Func <TUserRole, bool> >(all, param));
}