@foreach循环-LINQ /剃刀

Question

i use this code to filter the items in the list.

@foreach (var wu in ViewBag.GetWorkUser.Where(op => op.action == 0))
        {@wu.DisplayName}

code: linq / Razor

but i getting this error

Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type

i can´t understand what is wrong here. i have search and try some other code to solved this problem but still the same error.

someone can give me a hand with this pls?

Answer 1

ViewBag is a dynamic collection. So the type of op (lambda variable) is not known at compile time, you need to cast ViewBag.GetWorkUser before using Where like this:

((IEnumerable<User>)ViewBag.GetWorkUser).Where(op => op.action == 0))
        //    ^^^ User or whatever type you have

Answer 2

@foreach (var wu in ((IEnumerable<User>)ViewBag.GetWorkUser).Where(op => op.action == 0))
{
    wu.DisplayName
}

Answer 3

The correctly way sothing like this:

@foreach (var wu in ((List<GetWorkUser>)ViewBag.GetWorkUser).Where(op => op.action == 0)){
    <span> @wu.DisplayName </span>
}