Sequence不包含任何元素（system.invalidoperationexception：sequence不包含任何元素） [英] Sequence contains no elements(system.invalidoperationexception: sequence contains no elements)

问题描述

public ActionResult Details(int id)
        {
            adminContext AdminContext = new adminContext();
            admin user =AdminContext.userAdmin.Single(xyz => xyz.recid == id);
            return View(user);
        }

背景

context

public class adminContext :DbContext
    {
        public DbSet<admin> userAdmin { get; set; }
    }

我尝试过：



i创建了一个上下文类并在web配置文件中调用该上下文类然后通过控制器调用那些数据上面的代码请帮我找一个解决方案

What I have tried:

i created a context class and calling that context class in web config file then am calling those data through controller the above code please help me to find a solution

推荐答案

使用 SingeOrDefault [ ^ ]

use SingeOrDefault[^]

admin user = AdminContext.userAdmin.SingleOrDefault(xyz => xyz.recid == id);
           if(user !=null)
           {
               // your code to process
           }
           else
           {
               // show validation message, for item not present
           }

这篇关于Sequence不包含任何元素（system.invalidoperationexception：sequence不包含任何元素）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！