Linq2sql/GridView：分页不起作用？答案

【问题标题】：Linq2sql/GridView: Pagination not working?Linq2sql/GridView：分页不起作用？
【发布时间】：2010-10-12 16:31:22
【问题描述】：

考虑到我不想使用内置分页和排序，将 linq2sql 集合绑定到 GridView 的最佳方法是什么？

我试过了：

public static void BindEnquiryList(EnquiryQuery query, GridView view)
        {
            DataContext db = DataContextManager.Context
            //view.DataSource = (from e in EnquiryMethods.BuildQuery(query)
            view.DataSource = (from e in db.Enquiries
                               select new
                               {
                                    Id = e.Id,
                                    Name = e.Name,
                                    PublicId = EnquiryMethods.GetPublicId(e.PublicId),
                                    What = e.WorkType.DescriptionText,
                                    Where = e.EnquiryArea.DescriptionText,
                                    Who = e.EnquiryType0.DescriptionText,
                                    When = e.EnquiryTime0.DescriptionText,
                                    PriceRange = e.EnquiryPrice0.DescriptionText,
                                    DisplayPriceRange = e.EnquiryPrice0.Display,
                                    Description = e.Description,
                                    Published = e.EnquiryPublished
                               });

            view.DataBind();
        }

GridView 设置为 pagesize 20（并正确显示 20），但执行需要永远加载，当我记录 sql 时，我得到：

SELECT [t0].[Id], [t0].[Name], [t0].[PublicId] AS [publicId], [t1].[DescriptionText] AS [What], [t2].[DescriptionText] AS [Where], [t3].[DescriptionText] AS [Who], [t4].[DescriptionText] AS [When], [t5].[DescriptionText] AS [PriceRange], [t5].[Display] AS [DisplayPriceRange], [t0].[Description], [t0].[EnquiryPublished] AS [Published]
FROM [dbo].[Enquirys] AS [t0]
LEFT OUTER JOIN [dbo].[WorkTypes] AS [t1] ON [t1].[Id] = [t0].[EnquiryPlace]
LEFT OUTER JOIN [dbo].[EnquiryAreas] AS [t2] ON [t2].[Id] = [t0].[EnquiryPlace]
LEFT OUTER JOIN [dbo].[EnquiryTypes] AS [t3] ON [t3].[Id] = [t0].[EnquiryType]
LEFT OUTER JOIN [dbo].[EnquiryTimes] AS [t4] ON [t4].[Id] = [t0].[EnquiryTime]
LEFT OUTER JOIN [dbo].[EnquiryPrices] AS [t5] ON [t5].[Id] = [t0].[EnquiryPrice]
-- Context: SqlProvider(Sql2005) Model: AttributedMetaModel Build: 3.5.21022.8

没有任何顶部。我希望 GridView 管理 Take 和 Skip 操作？

【问题讨论】：

标签： c# sql-server linq-to-sql tsql

【解决方案1】：

最好的方法是使用 LinqDataSource。为 LinqDataSource 上的选择事件创建一个事件处理程序。

protected void LinqDataSource1_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
    e.Result = (from e in db.Enquiries
                               select new
                               {
                                    Id = e.Id,
                                    Name = e.Name,
                                    PublicId = EnquiryMethods.GetPublicId(e.PublicId),
                                    What = e.WorkType.DescriptionText,
                                    Where = e.EnquiryArea.DescriptionText,
                                    Who = e.EnquiryType0.DescriptionText,
                                    When = e.EnquiryTime0.DescriptionText,
                                    PriceRange = e.EnquiryPrice0.DescriptionText,
                                    DisplayPriceRange = e.EnquiryPrice0.Display,
                                    Description = e.Description,
                                    Published = e.EnquiryPublished
                               });

}

然后，LinqDataSource 将为您处理分页和排序，并且您可以对 linq 查询进行编译检查

【讨论】：

【解决方案2】：

我不确定，但你可以使用 LinqDataSource 吗？否则，我认为 GridView 要求数据位于 DataSet 中，以便它自己进行分页和排序。

【讨论】：

【解决方案3】：

GridView 控件不支持

IEnumerable 进行排序和分页。但是您当然可以使用 List。只需 .ToList() 你的结果集。

grid_PageIndexChanging(object sender, GridViewPageEventArgs e) {
        this.grid.PageIndex = e.NewPageIndex;
        this.grid.DataSource = this.DataSource;
        this.grid.DataBind();
    }

【讨论】：