在cshtml中分组
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【中文标题】在cshtml中分组【英文标题】：GroupBy in cshtml 【发布时间】：2021-12-25 20:44:19 【问题描述】：我正在尝试按表中的 PlayerId 进行分组，但出现以下错误：
'IGrouping
任何帮助将不胜感激。
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@model IEnumerable<Block_City_Website.Models.Stat>
@using static MoreLinq.Extensions.LagExtension;
@using static MoreLinq.Extensions.LeadExtension;
@using MoreEnumerable = MoreLinq.MoreEnumerable;
<div class="container p-3">
<div class="row pt-4">
<div class="col-6">
<h2 class="text-primary">Stats List</h2>
</div>
<div class="col-6 text-right">
<a asp-controller="Stat" asp-action="Index" class="btn btn-primary">Back to Stats</a>
</div>
</div>
<br />
@if (Model.Count() > 0)
<table class="table table-bordered table-striped" style="width:100%">
<thead>
<tr>
<th>
Player
</th>
<th>
Team
</th>
<th>
Points
</th>
<th>
Rebounds
</th>
<th>
Assists
</th>
<th>
Steals
</th>
<th>
Blocks
</th>
</tr>
</thead>
<tbody>
@foreach (var stat in Model.GroupBy(x => x.PlayerId))
<tr>
<td >@stat.Player.FirstName @stat.Player.LastName</td>
<td >@stat.Team.TeamName</td>
<td >@stat.Points</td>
<td >@stat.Rebounds</td>
<td >@stat.Assists</td>
<td >@stat.Steals</td>
<td >@stat.Blocks</td>
</tr>
</tbody>
</table>
else
<p>No Stats created yet</p>
</div>
@if (Model.Count() > 0)
<table class="table table-bordered table-striped" style="width:100%">
<thead>
<tr>
<th>
Player
</th>
<th>
Team
</th>
<th>
Points
</th>
<th>
Rebounds
</th>
<th>
Assists
</th>
<th>
Steals
</th>
<th>
Blocks
</th>
</tr>
</thead>
<tbody>
<tr>
<td >Stephen Curry</td>
<td >Warriors</td>
<td >58</td>
<td >15</td>
<td >12</td>
<td >5</td>
<td >3</td>
</tr>
<tr>
<td >Lebron James</td>
<td >Lakers</td>
<td >64</td>
<td >19</td>
<td >17</td>
<td >5</td>
<td >5</td>
</tr>
</tbody>
</table>
else
<p>No Stats created yet</p>
<div>
</div>
控制器
using Block_City_Website.Data;
using Block_City_Website.Models;
using Block_City_Website.Models.ViewModels;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Block_City_Website.Controllers
public class StatController : Controller
private readonly ApplicationDbContext _db;
public StatController(ApplicationDbContext db)
_db = db;
public IActionResult Index()
IEnumerable<Stat> objList = _db.Stats;
foreach(var obj in objList)
obj.Player = _db.Players.FirstOrDefault(u => u.Id == obj.PlayerId);
obj.Team = _db.Teams.FirstOrDefault(u => u.Id == obj.TeamId);
return View(objList);
//GET-Create
public IActionResult Create()
//IEnumerable<SelectListItem> TypeDropDown = _db.Players.Select(i => new SelectListItem
//
// Text = i.FirstName + " " +i.LastName,
// Value = i.Id.ToString()
//);
//ViewBag.TypeDropDown = TypeDropDown;
StatVM statVM = new StatVM()
Stat = new Stat(),
TypeDropDown = _db.Players.Select(i => new SelectListItem
Text = i.FirstName + " " + i.LastName,
Value = i.Id.ToString()
),
TypeDropDown1 = _db.Teams.Select(i => new SelectListItem
Text = i.TeamName,
Value = i.Id.ToString()
)
;
return View(statVM);
//POST-Create
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Create(StatVM obj)
if (ModelState.IsValid)
//obj.PlayerId = 1;
//obj.TeamId = 1;
_db.Stats.Add(obj.Stat);
_db.SaveChanges();
return RedirectToAction("Index");
return View(obj);
// GET-Delete
public IActionResult Delete(int? id)
if (id == null || id == 0)
return NotFound();
var obj = _db.Stats.Find(id);
if (obj == null)
return NotFound();
return View(obj);
// POST-Delete
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult DeletePost(int? id)
var obj = _db.Stats.Find(id);
if (obj == null)
return NotFound();
_db.Stats.Remove(obj);
_db.SaveChanges();
return RedirectToAction("Index");
// GET Update
public IActionResult Update(int? id)
StatVM expenseVM = new StatVM()
Stat = new Stat(),
TypeDropDown = _db.Players.Select(i => new SelectListItem
Text = i.FirstName + " " + i.LastName,
Value = i.Id.ToString()
),
TypeDropDown1 = _db.Teams.Select(i => new SelectListItem
Text = i.TeamName,
Value = i.Id.ToString()
)
;
if (id == null || id == 0)
return NotFound();
expenseVM.Stat = _db.Stats.Find(id);
if (expenseVM.Stat == null)
return NotFound();
return View(expenseVM);
// POST UPDATE
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Update(StatVM obj)
if (ModelState.IsValid)
_db.Stats.Update(obj.Stat);
_db.SaveChanges();
return RedirectToAction("Index");
return View(obj);
public IActionResult TotStats()
IEnumerable<Stat> objList = _db.Stats;
foreach (var obj in objList)
obj.Player = _db.Players.FirstOrDefault(u => u.Id == obj.PlayerId);
obj.Team = _db.Teams.FirstOrDefault(u => u.Id == obj.TeamId);
return View(objList);
型号
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;
namespace Block_City_Website.Models
public class Stat
[Key]
public int Id get; set;
[Required]
[Range(0, int.MaxValue, ErrorMessage ="Amount must not be less than 0")]
public int Points get; set;
[Required]
[Range(0, int.MaxValue, ErrorMessage = "Amount must not be less than 0")]
public int Rebounds get; set;
[Required]
[Range(0, int.MaxValue, ErrorMessage = "Amount must not be less than 0")]
public int Assists get; set;
[Required]
[Range(0, int.MaxValue, ErrorMessage = "Amount must not be less than 0")]
public int Steals get; set;
[Required]
[Range(0, int.MaxValue, ErrorMessage = "Amount must not be less than 0")]
public int Blocks get; set;
[Required]
[DisplayName("Player")]
public int PlayerId get; set;
[ForeignKey("PlayerId")]
public virtual Player Player get; set;
[Required]
[DisplayName("Team")]
public int TeamId get; set;
[ForeignKey("TeamId")]
public virtual Team Team get; set;
【问题讨论】：
【参考方案1】：当您运行一个组时，它会将一个平面对象列表转换为一个列表列表。像这样的平面列表：
PlayerScore
.PlayerId, .GameScore
1, 20
1, 40
1, 60
2, 30
2, 50
按 PlayerId 分组，最终看起来像这样：
Key, (list of PlayerScores)
1, [1,20, 1,40, 1,60]
2, [2,30, 2,50]
所以你需要欣赏的是你的 GroupBy 已经产生了一个列表列表，你不能再直接输出玩家的东西了；你foreaching 的每个stat 条目本身就是一个统计对象的集合
这意味着你必须做一些在列表上下文中有意义的事情
foreach (var stats in Model.GroupBy(x => x.PlayerId))
<tr>
<td >@stats.First().Player.FirstName @stats.First().Player.LastName</td>
<td >@stats.First().Team.TeamName</td>
<td >@stats.Sum(stat => stat.Points)</td>
<td >@stats.Sum(stat => stat.Rebounds)</td>
<td >@stats.Sum(stat => stat.Assists)</td>
<td >@stats.Sum(stat => stat.Steals)</td>
<td >@stats.Sum(stat => stat.Blocks)</td>
我将stat 重命名为stats 以概述您正在使用foreaching 的项目中可能有多个内容，我假设您希望对数字统计数据进行总结，但如果您有其他想法，例如平均你必须改变它
【讨论】：
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