Question

我是asp.net中linq查询的新手。我希望通过概念使用组来明智地获得部门的总薪水。我想要使用linq查询结果所以请帮助我的朋友。我拿了一张桌子见下文。你能为我的查询提供解决方案吗？我曾经尝试过，但我没有找到解决方案。

我的数据表是：

    id   name     dept   sal
     1   ABC      it    10000
     2   BBC      it    20000
     3   CCA      hr    30000
     4   DDA      hr    40000
     5   MMN      admin 50000

结果如：

       dept   sal  
      ----------------- 
       It    30000
       Hr    70000
       Admin 50000

Answer 1

嗨，得到你想要的东西应该不难。

tablename.GroupBy(g => g.dept)
.Select(s => new {
       dept = s.Key,
       sal = s.Sum(t => t.sal)
       })
.ToList();

这会为您提供每个部门的总薪资清单

Answer 2

类似的东西：

context.table.GroupBy(t => t.dept, e => e.sal).Select(r => new { key = r.Key, sum = r.Sum(x => x) });

编辑：

要将linq与dataTable一起使用，请添加对System.Data.DataSetExtensions的引用并添加System.Data命名空间并将AsEnumerable()调用到您的dataTable。另请查看Here

Answer 3

你可以做这样的事情......

var list = table.GroupBy(p=>p.dept,q=>q.sal).Select(x=>new { dept = x.Key, sal = x.Sum(s=>s.sal)});

Answer 4

        List<Student> studentsList = new List<Student>()
        {
           new Student(){Id = 1,Name ="krish",Gender="male",City="ahmedabad",Salary=2750},
           new Student(){Id = 2,Name ="rahul",Gender="male",City="delhi",Salary=1000},
           new Student(){Id = 3,Name ="neha",Gender="female",City="surat",Salary=2500},
           new Student(){Id = 4,Name ="dev",Gender="male",City="mumbai",Salary=7800},
           new Student(){Id = 5,Name ="priya",Gender="female",City="ahmedabad",Salary=5600},
        };

        var queryList = from SL in studentsList group SL by SL.Gender into GROUPGENDER orderby GROUPGENDER.Key select GROUPGENDER;
        foreach(var studentList in queryList)
        {
            Console.WriteLine(">>>>>group by<<<<<");
            Console.WriteLine(studentList.Key);
            Console.WriteLine(">>>>>group by<<<<<");
            foreach (var item in studentList)
            {
                Console.WriteLine(item.Id);
                Console.WriteLine(item.Name);
                Console.WriteLine(item.Gender);
                Console.WriteLine(item.City);
            }                    
        }                     
        Console.Read();

在asp.net中使用linq概念的部门明智组的总薪水

4 个答案: