gridview不显示通过BLL的值？

Question

我的控件不会返回我的gridview中的值。

表适配器运行查询罚款并显示数据。

这里是控制我的代码：

categoriesBLL categoriesLogic = new categoriesBLL(); 
GridView1.DataSource = categoriesLogic.GetCategories(); 
GridView1.DataBind(); 

，这里是我的BLL：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using NopSolutions.NopCommerce.Nop.DataAccess.MegaProductMenuTableAdapters; 

namespace NopSolutions.NopCommerce.BusinessLogic.MegaProductsMenu 
{ 
    [System.ComponentModel.DataObject] 
    public class categoriesBLL 
    { 

     private Nop_CategoryTableAdapter _categoriesAdapter = null; 
     protected Nop_CategoryTableAdapter Adapter 
     { 
      get 
      { 
       if (_categoriesAdapter == null) 
        _categoriesAdapter = new Nop_CategoryTableAdapter(); 

       return _categoriesAdapter; 
      } 
     } 



     [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Select, true)] 
     public Nop_CategoryTableAdapter GetCategories() 
     { 
      return _categoriesAdapter; 
     } 


    } 

} 

我DAL看起来是这样的：

如果直接连接到DAL我可以得到值显示。所以我认为我的BLL出了问题，但它会是什么？我收到没有错误消息。

我的GridView控件来源：

<asp:GridView ID="GridView1" runat="server" CssClass="DataWebControlStyle" AutoGenerateColumns="True"> 
     <HeaderStyle CssClass="HeaderStyle" /> 
     <AlternatingRowStyle CssClass="AlternatingRowStyle" /> 
    </asp:GridView> 

Answer 1

我通过asigning DataTable中解决了这个：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using NopSolutions.NopCommerce.Nop.DataAccess.MegaProductMenuTableAdapters; 

namespace NopSolutions.NopCommerce.BusinessLogic.MegaProductsMenu 
{ 
    [System.ComponentModel.DataObject] 
    public class categoriesBLL 
    { 

     private Nop_CategoryTableAdapter _categoriesAdapter = null; 
     protected Nop_CategoryTableAdapter Adapter 
     { 
      get 
      { 
       if (_categoriesAdapter == null) 
        _categoriesAdapter = new Nop_CategoryTableAdapter(); 

       return _categoriesAdapter; 
      } 
     } 

     [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Select, true)] 
     public NopCommerce.Nop.DataAccess.MegaProductMenu.Nop_CategoryDataTable GetCategories() 
     { 
      return Adapter.GetCategories(); 
     } 

    } 

} 

Answer 2

你有任何列定义？或者是AutoGenerateColumns == true

Answer 3

1. categoriesBLBL categories逻辑类= new categoriesBLL（）;

2. GridView1.DataSource = categoriesLogic.GetCategories（）;

3. GridView1.DataBind（）;

改线2以下

GridView1.DataSource = categoriesLogic.Adapter.GetCategories();