英文:
The model item passed into the ViewDataDictionary EF but this ViewDataDictionary instance requires 'System.Collections.Generic.List
问题
要将我的ASP.NET MVC Web应用与数据库连接，使用Entity Framework Core（v5.17）。但在尝试最终使它工作时，它显示了以下消息：
> InvalidOperationException: 传递到ViewDataDictionary的模型项的类型为'Microsoft.EntityFrameworkCore.Internal.InternalDbSet1[test_deploiement.Models.PublisherModel]'，但此ViewDataDictionary实例需要类型为'System.Collections.Generic.List1[test_deploiement.Models.PublisherModel]'的模型项。
模型类：
public class PublisherModel
{
[Key]
public int Id { get; set; }
[Required]
public string Name { get; set; }
public PublisherModel(int id, string name)
{
Id = id;
Name = name;
}
}
控制器：
public class HomeController : Controller
{
private readonly ApplicationDbContext _db;
public IEnumerable<PublisherModel> Publishers { get; set; }
public HomeController(ApplicationDbContext db)
{
_db = db;
}
public IActionResult adminpublishermanagement()
{
Publishers = _db.Publisher_master_tbl;
return View(Publishers);
}
}
视图：
<tbody>
@foreach (var Publishers in Model)
{
<tr>
<td scope="row">@Html.DisplayFor(modelItem => Publishers.Id)</td>
<td>@Html.DisplayFor(modelItem => Publishers.Name)</td>
</tr>
}
</tbody>
我尝试查看我的类的名称是否有问题，但我不确定。
英文:
I want to connect my ASP.NET MVC web app with the database using Entity Framework Core (v5.17).
But when trying to make it work finally it show me this message :
> InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'Microsoft.EntityFrameworkCore.Internal.InternalDbSet1[test_deploiement.Models.PublisherModel]', but this ViewDataDictionary instance requires a model item of type 'System.Collections.Generic.List1[test_deploiement.Models.PublisherModel]'.
Model class:
public class PublisherModel
{
[Key]
public int Id { get; set; }
[Required]
public string Name { get; set; }
public PublisherModel(int id, string name)
{
Id = id;
Name = name;
}
}
Controller
public class HomeController : Controller
{
private readonly ApplicationDbContext _db;
public IEnumerable<PublisherModel> Publishers { get; set; }
public HomeController(ApplicationDbContext db)
{
_db = db;
}
public IActionResult adminpublishermanagement()
{
//List<PublisherModel> publisher = new List<PublisherModel>();
//publisher.Add(new PublisherModel(101, " Lafond"));
//publisher.Add(new PublisherModel(102, " Casio"));
//publisher.Add(new PublisherModel(103, "J'aime lire"));
//publisher.Add(new PublisherModel(104, "Time ofpost"));
//publisher.Add(new PublisherModel(105, "Le quotidien"));
Publishers = _db.Publisher_master_tbl;
return View(Publishers);
}
}
View
<tbody>
@foreach (var Publishers in Model)
{
<tr>
<td scope="row">@Html.DisplayFor(modelItem => Publishers.Id)</td>
<td>@Html.DisplayFor(modelItem => Publishers.Name)</td>
</tr>
}
</tbody>
I tried to look if the name of my classes were disfunctional but I'm not sure of it.
答案1
得分: 1
你应该在将它传递给视图之前在 DbSet 上调用 .ToList()：
Publishers = _db.Publisher_master_tbl.ToList();
英文:
You should call .ToList() on the DbSet before passing it to your view:
Publishers = _db.Publisher_master_tbl.ToList();
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