Question

我使用.net Core 1.1.1进行应用程序我需要检查当前用户是否是标记帮助程序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")未注释我有异常：“System.Private.CoreLib.ni.dll中发生了'System.ObjectDisposedException'类型的未处理异常”

我无法理解为什么。谢谢你的帮助。

Answer 1

进程是一种同步方法，并使其成为异步无效意味着它不会等待您的函数完成。您应该改为覆盖ProcessAsync并返回任务。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 core IsInRoleAsync'System.ObjectDisposedException'

1 个答案: