.net 核心 IsInRoleAsync 'System.ObjectDisposedException'

Question

我正在研究使用 .net Core 1.1.1 的应用程序我需要检查当前用户是否是标签助手中管理员角色的成员。 TagHelper 的构造函数是

public MyTagHelper(UserManager<User> UserManager, IActionContextAccessor ActionContextAccessor)
    {
        userManager = UserManager;
        actionContextAccessor = ActionContextAccessor;            
    }

然后覆盖处理方法：

 public override async void Process(TagHelperContext context, TagHelperOutput output)
    {
     currentUser = await userManager.GetUserAsync(actionContextAccessor.ActionContext.HttpContext.User);
        isAdmin = await userManager.IsInRoleAsync(currentUser, "admin");
    }

如果保留字符串 isAdmin = await userManager.IsInRoleAsync(currentUser, "admin") 未注释我有例外："An unhandled exception of type 'System.ObjectDisposedException' occurred in System.Private.CoreLib.ni.dll"

我不明白为什么。感谢您的帮助。

Answer 1

Process 是一种同步方法，将其设置为 async void 意味着它不会等待您的函数完成。您应该改写 ProcessAsync 和 return 任务。试试这个：

public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
    currentUser = await userManager.GetUserAsync(actionContextAccessor.ActionContext.HttpContext.User);
    isAdmin = await userManager.IsInRoleAsync(currentUser, "admin");
}

.net 核心 IsInRoleAsync 'System.ObjectDisposedException'

.net core IsInRoleAsync 'System.ObjectDisposedException'

c#

asp.net-core-mvc

.net-core-1.1