.net - 如何将类别添加到已登录的用户ASP.NET MVC(How should add category to logged user ASP.NET MVC)

Question

I'm writing Learning Words App.

(我正在写学习单词应用程序。)

I want to do: When user is logged in > goes to "My Examples" > Create new Category > input new category name ( this is what i need, app automatically adding new category to logged user.

(我想做的是：当用户登录>进入“我的示例”>创建新类别>输入新类别名称（这是我所需要的，应用程序会自动将新类别添加到登录的用户。)

Any ideas?

(有任何想法吗？)

User Category

(用户 类别)

I changed User class nad aded ViewModel.

(我更改了用户类并添加了ViewModel。)

User

(用户)

ViewModel

(视图模型)

Create in CategoriesController

(在CategoriesController中创建)

When i'm adding new Category

(当我添加新类别时)

I have error " System.InvalidOperationException: "Sequence has no elements."

(我收到错误消息“ System.InvalidOperationException：”序列没有元素。“)

  ask by HazarV17 translate from so

Answer 1

等待大神答复