【C#】Exception when trying Where a PredicateBuilder predicate

Cannot convert expression type 'System.Linq.Expressions.Expression>' to return type 'System.Func'

無法從 'System.Linq.Expressions.Expression>' 轉換為 'System.Func'

第二次碰到這個問題還是傻掉，白白浪費快一小，還是寫一下，簡單的說 IEnumerable 的 Where 是不能串 PredicateBuilder predicate 的，必須是 IQueryable，所以

IEnumerable filteredMembers = _members.Where(something);
var orPred = PredicateBuilder.True();
foreach (Condition condition in target.ValidMemberConditions)
{
    orPred = orPred.Or(m => m.BusinessCode == condition.BusinessCode &&
        m.MemberTypeID == condition.MemberType);
}
filteredMembers = filteredMembers.Where(orPred); // X

這樣不行，但

IQueryable filteredMembers = _members.Where(something).AsQueryable(); // modified
var orPred = PredicateBuilder.True();
foreach (Condition condition in target.ValidMemberConditions)
{
    orPred = orPred.Or(m => m.BusinessCode == condition.BusinessCode &&
        m.MemberTypeID == condition.MemberType);
}
filteredMembers = filteredMembers.Where(orPred); // O

這樣可以