Grid.Mvc + Entity Framework 异常

Question

需要 Grid.Mvc 方面的帮助。我正在传递 Entity Framework 生成的 IQueryable 集合并得到异常

操作方法：

public ActionResult Index(int id)
{
        IQueryable<Document> documents = _dbContext.Document;

        var model = new DocumentListViewModel()
        {                Documents = documents
        };

        return View(model);
}

文档列表视图模型：

public class DocumentListViewModel
{
    public IQueryable<Document> Documents { get; set; }
}

查看：

@model CompanyName.DocFlow.Web2.Models.DocumentListViewModel
@using GridMvc.Html;

@Html.Grid(Model.Documents).Columns(columns =>
                {
                    columns.Add(x => x.CreatedDate).Titled("Дата");//.Filterable(true);
                    columns.Add(x => x.IncomingNumber).Titled("Входящий номер");//.Filterable(true);
                    columns.Add(x => x.Description).Titled("Краткое описание");
                }).WithPaging(10)

异常：

An exception of type 'System.NotSupportedException' occurred in EntityFramework.SqlServer.dll but was not handled in user code

Additional information: The method 'Skip' is only supported for sorted input in LINQ to Entities. The method 'OrderBy' must be called before the method 'Skip'.

文档指出：

If your data source is database (for example) you need to pass IQueryable collection to the grid. Grid.Mvc uses IQueryable interface to construct query expressions to your data collection.

When you go to some page the grid invokes .Skip(N).Take(N) methods and when you sort data the grid invokes OrderBy or OrderByDescending methods etc.

教程link：Grid.Mvc

Answer 1

MVC 网格说明：

When you go to some page the grid invokes .Skip(N).Take(N) methods and when you sort data the grid invokes OrderBy or OrderByDescending methods etc.

排序过程可以封装字段get方法，也可以在ActionResult方法中做同样的操作

示例代码：

public class DocumentListViewModel
{
    private IQueryable<Document> _Documents;
    public  IQueryable<Document> Documents 
   { 
     get 
     { 
        return _Documents.Ordery(x=>x.Id);
     } 
     set 
     { 
        _Documnets = value;
     } 
   }
}

或

public ActionResult Index(int id)
{
        IQueryable<Document> documents = _dbContext.Document.OrderBy(x=>x.Id);

        var model = new DocumentListViewModel()
        {             
            Documents = documents
        };

        return View(model);
}

Grid.Mvc + Entity Framework 异常

Grid.Mvc + Entity Framework exception

c#

asp.net-mvc

grid.mvc