Question

我想在视图上显示SQL数据。但我不能在控制器上：

var comments = (from p in ctx.Profiles
                   join sc in ctx.SuggestionComments on p.UserId equals sc.Crtr
                   join s in ctx.Suggestions on sc.SuggestionId equals s.Id
                   join u in ctx.Users on s.Crtr equals u.Id
                   where u.Email == mail
                   orderby sc.Crtm descending
                   select new { p.UserName, p.UserId, p.PhotoUrl, OneriId = s.Id, sc.Crtm }
               ).Take(10);
ViewBag.commentss = comments;

在视图上：

@foreach (var items in ViewBag.commentss)
{
    <tr>
        <td>
            @items.UserName
        </td>
        <td>
            @items.UserId
        </td>
        <td>
            @items.PhotoUrl
        </td>
        <td>
            @items.OneriId
        </td>
        <td>
            @items.Crtm
        </td>
    </tr>
}

它不起作用：

Additional information: 'object' a 'UserName' not contains...

Answer 1

ViewBag.commentss将返回Object，因此您无法对此进行foreach循环。

因此，不要使用匿名类型，而是创建一个具有相关属性的类。所以在你的案例中，类就是这样的。

 Public class UserDetails
    {
    public string UserName{get;set;}
    public int UserId{get;set;}
    public string PhotoUrl{get;set;}
    public int OneriId {get;set;}
    public string Crtm{get;set;}
    }

现在修改您的linq查询，如下所示

var comments = (from p in ctx.Profiles


                        join sc in ctx.SuggestionComments on p.UserId equals sc.Crtr
                        join s in ctx.Suggestions on sc.SuggestionId equals s.Id
                        join u in ctx.Users on s.Crtr equals u.Id
                        where u.Email == mail
                        orderby sc.Crtm descending
                        select new UserDetails{UserName = p.UserName, UserId =p.UserId,PhotoUrl= p.PhotoUrl, OneriId = s.Id, Crtm =sc.Crtm }).Take(10);
        ViewBag.commentss = comments;

现在在视野中。你可以按照以下

对你的viewbag进行类型转换

var userDetails = ViewBag.commentss as List<UserDetails>;

然后你可以运行foreach循环

foreach(var userDetail in userDetails )
{
  // Write your code here
}

无法在View Asp.Net MVC5上显示SQL数据

1 个答案: