如何检索用户的ASPNET身份通过LINQ的特定角色 [英] How to retrieve Users with a specific role via Linq in ASPnet Identity

问题描述

我需要检索的，这是我认为应该进行直接的一个特定角色的所有用户，但是，这里的问题。

I need to retrieve all users of a specific role, something I think should be made straightforward, however, here is the problem.

ApplicationUser的作用导航属性不是角色列表（IdentityRole），但（IdentityUserroles）集合链接用户和角色的中间表。所以，这是code我有，但它不能正常工作。

The Roles navigation Property of ApplicationUser is not the list of roles (IdentityRole) but a collection of (IdentityUserroles) the intermediate table that links users and roles. So, this is the code I have, but it does not work.

[HttpPost]
[Authorize(Roles = "Admin, Recepcionista, Orientador")]
public ActionResult SearchResults(SearchCriteriaViewModel criteria)
{


    List<SearchResultViewModel> results = new List<SearchResultViewModel>();
    var clients = new List<ApplicationUser>();

    using (var context = new ApplicationDbContext())
    {
        IdentityUserRole role = new IdentityUserRole();
        var tempRole = (from _role in context.Roles
                        where _role.Name == "client"
                        select _role).FirstOrDefault();
        role.Role = tempRole;

        clients = (from client in context.Users
                   where client.Email.Contains(criteria.SearchCriteria)
                   || client.FirstName.Contains(criteria.SearchCriteria)
                   || client.MiddleName.Contains(criteria.SearchCriteria)
                   || client.LastName.Contains(criteria.SearchCriteria)
                   || client.SecondLastName.Contains(criteria.SearchCriteria)
                   || client.UserName.Contains(criteria.SearchCriteria)
                   && client.Roles.Contains(role)
                   select client).ToList();


    }

    foreach (var client in clients)
    {
        results.Add(new SearchResultViewModel()
        {
            Email = client.Email,
            FirstName = client.FirstName,
            MiddleName = client.MiddleName,
            LastName = client.LastName,
            SecondLastName = client.SecondLastName,
            UserName = client.UserName
        });
    }

    SearchClientViewModel model = new SearchClientViewModel();
    model.SearchResults = results;

    return View("Index", model);

}

Linq的抛出以下异常

Linq throws the following Exception

型的System.NotSupportedException异常发生在
  mscorlib.dll中，但在用户code没有处理

An exception of type 'System.NotSupportedException' occurred in mscorlib.dll but was not handled in user code

信息：无法创建类型的常数值
  Microsoft.AspNet.Identity.EntityFramework.IdentityUserRole。只要
  基本类型或枚举类型，在这方面的支持。

Additional information: Unable to create a constant value of type 'Microsoft.AspNet.Identity.EntityFramework.IdentityUserRole'. Only primitive types or enumeration types are supported in this context.

如何才能做到这一点，为什么导航性能是不是角色的集合，这会是我们需要报告的错误？

How can this be done, Why the navigation properties is not a collection of Roles, could this be a bug we need to report?

推荐答案

错误信息很清楚：你不能叫包含对非原始对象的集合。

Error message is quite clear: you can't call Contains on collection of non-primitive objects.

尝试以下操作：

    clients = (from client in context.Users
               where client.Email.Contains(criteria.SearchCriteria)
               || client.FirstName.Contains(criteria.SearchCriteria)
               || client.MiddleName.Contains(criteria.SearchCriteria)
               || client.LastName.Contains(criteria.SearchCriteria)
               || client.SecondLastName.Contains(criteria.SearchCriteria)
               || client.UserName.Contains(criteria.SearchCriteria)
               && client.Roles.Select(r => r.Name).Contains("client")
               select client).ToList();

这篇关于如何检索用户的ASPNET身份通过LINQ的特定角色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！