绑定 DataAdapter->DataSet->LINQ->ASP.Net DataGrid 时出错答案

【问题标题】：Error binding DataAdapter->DataSet->LINQ->ASP.Net DataGrid绑定 DataAdapter->DataSet->LINQ->ASP.Net DataGrid 时出错
【发布时间】：2011-11-17 05:24:54
【问题描述】：

我有以下代码：

using (SqlConnection cn = new SqlConnection(Connection.Instance.ConnectionString))
{
    // Open the connection
    using (SqlCommand cmd = new SqlCommand())
    {
        try
        {
            cmd.Connection = cn;

            cmd.CommandText = "Select Customers.CustomerID, Addresses.AddressCode, Addresses.FirstName, Addresses.LastName, Addresses.Address1, Addresses.City, Addresses.State, " +
            "Addresses.Zip, Addresses.Home AS HomePhone, Addresses.Phone AS WorkPhone, Addresses.EmailAddress  From Customers " +
            "LEFT OUTER JOIN Addresses ON Addresses.ID=Customers.AddressID " +
            "Where CustomerType IN ('HomeOwner', 'Home Owner') AND Customers.ResellerID=@ResellerID ";

            cmd.Parameters.AddWithValue("@ResellerID", base.UserID);

            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet dsCustomer = new DataSet();
            da.Fill(dsCustomer);

            var customers = from c in dsCustomer.Tables[0].AsEnumerable().AsQueryable()
                            where c.Field<string>("CustomerID") == txtSearchCriteria.Text
                            select c;

            dgCustomers.CurrentPageIndex = 0;

            dgCustomers.DataSource = customers;
            dgCustomers.DataBind();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message + e.StackTrace);
        }
        finally
        {
            if ((cn != null) && (cn.State != ConnectionState.Closed))
                cn.Close();
        }
    }
}

这给了我错误

AllowCustomPaging must be true and VirtualItemCount must be set for a DataGrid with ID 'dgCustomers' when AllowPaging is set to true and the selected data source does not implement ICollection.   at System.Web.UI.WebControls.DataGrid.CreateControlHierarchy(Boolean useDataSource)

如何转换此 LINQ 查询以使其可分页？

注意：这是我正在尝试做的简化版本。我知道在这个例子中我可以简单地修改 SQL 语句以包含“And CustomerID=@CustomerID”并完全绕过 LINQ。但是，从大局来看，我做不到。

【问题讨论】：

标签： asp.net linq data-binding datagrid

【解决方案1】：

错误信息很清楚，您需要实现分页逻辑以利用分页。顺便说一句，要使您的代码正常工作，只需使用 ICollection 作为数据源，更改这一行：

dgCustomers.DataSource = customers.ToList();

【讨论】：