我的控制器有一个返回IQuerable< Entity>的操作，但即使我允许所有的功能，我也无法使用$ filter = substringof函数。

[Authorize]
public class MyController : ODataController
{
    [EnableQuery(AllowedFunctions=AllowedFunctions.All)]
    public IQueryable<Entity> GetEntities()
    {
      return GetMyQueryable();
    }
}

当我点击http：// localhost：49844 / Entities /？$ filter = substringof(‘Queen’，Name)时，

我得到一个错误，表示substringof是不允许的。

{
"error": {
    "code": "","message": "The query specified in the URI is not valid. An unknown function with name 'substringof' was found. This may also be a function import or a key lookup on a navigation property,which is not allowed.","innererror": {
        "message": "An unknown function with name 'substringof' was found. This may also be a function import or a key lookup on a navigation property,"type": "Microsoft.OData.Core.ODataException",

任何想法为什么我可能会看到这个错误？