asp.net – 将linq查询结果转换为datatable C#

我想将 linq查询结果转换为datatable,以便我可以将数据表分配给GridView以在asp页面上显示它.

但是我无法将结果转换为datatable,我没有在我的代码中获取copyToTable()方法.

请告诉我这里做错了什么？

var gradeData = (from data in oAngieCtxt.prc_ShopInstanceCustomersData(Convert.ToInt32(this.ShopInstanceID),10000,false)
                     .Where( row => row.RecievedPoints != "n/a" )
                    .GroupBy(row => new { row.Name })
                    .Select(g => new GroupedPoints()
                    {
                        Name = g.Key.Name,TotalPoints = g.Sum(x => Convert.Todouble(x.RecievedPoints) * (x.Weightage.ToString() == "0.00" ? 1 : Convert.Todouble(x.Weightage)))
                    })
                     select data).ToList();

 DataTable dt = gradeData --gradeData.copyToTable()

注意：可以使用对dataextentions dll的引用.

提前致谢

解决方法

你应该得到 DataTableExtensions.CopyToDataTable

删除ToList().

copyToDataTable是IEnumerable< DaTarow>延期(不幸的是).

下面有一个自定义copyToDataTable扩展方法的解决方案.

var gradeData = (from data in oAngieCtxt.prc_ShopInstanceCustomersData(
                 Convert.ToInt32(this.ShopInstanceID),false)
                .Where( row => row.RecievedPoints != "n/a" )
                .GroupBy(row => new { row.Name })
                .Select(g => new
                {
                    Name = g.Key.Name,TotalPoints = g.Sum(x => Convert.Todouble(x.RecievedPoints) 
                    * (x.Weightage.ToString() == "0.00" ? 1 
                      : Convert.Todouble(x.Weightage)))
                })
                 select data);

var dt = gradeData.copyToDataTable();

编辑：

这是CopyToDataTable的更有用的实现DaTarow没有类型约束.

public static class DataSetLinqOperators
  {
    public static DataTable copyToDataTable<T>(this IEnumerable<T> source)
    {
        //you find the Objectshredder implementation on the blog wich was linked.
        return new Objectshredder<T>().shred(source,null,null);
    }

    public static DataTable copyToDataTable<T>(this IEnumerable<T> source,DataTable table,LoadOption? options)
    {
        return new Objectshredder<T>().shred(source,table,options);
    }

  }

原文地址：https://www.jb51.cc/aspnet/249172.html