AspxGridview 不支持所指定的方法 (独立数据访问层)
相信大家刚开始使用ASPxGridView一定遇到这样的情况：
使用ASPxGridView控件时，点Edit或new按钮，出来Update和cancel，编辑完数据后点击Update，出错：在正在编辑的那行下方会出来一汗背景淡红色字体是红色的字“不支持所指定的方法”，英文是Specified method is not supported.
这两天正在试用这个控件，被这个问题困扰多时，在网上看到的一些资料，要么感觉处理过程特别繁琐，要么就是省略了我真正关心的内容。
刚刚处理了这个问题，有点兴奋，也想让被这个问题困扰的朋友们早点解脱，所以记录一下我的一点心得。
其实要解决这样问题，非常简单：
1、确保ASPxGridView已设置了KeyFieldName
2、确保ASPxGridView已定义了事件 OnRowDeleting, OnRowInserting, OnRowUpdating
3、后台代码中有对 OnRowDeleting, OnRowInserting, OnRowUpdating 事件的处理。
但为什么这么一简单的问题很多人都会遇到呢？
我觉得这应该算是 Vs2008的一个bug，具体表现为：
在vs2008的设计视图上做的一些修改，在代码视图中没能被体现；简单讲就是我们修改了界面，html代码未发生任何变化！
所以我们明明在设计视图中为aspxgridview定义了OnRowDeleting, OnRowInserting, OnRowUpdating 事件，但html代码中却没有，这也正是我们努力了很久都没解决问题的原因，Vs2008骗了我们！#%&#@#……
其实不光这些事件，我发现有时在设计视图增加或修改了AspxGridview的列，代码也同样没有变化。用的是vs2008，不知道在vs2005下会不会有这些问题？如有在vs2005下使用DevExpress控件的朋友，还请说说。
以下是我测试时的一个完整的例子，供参考：
1、aspx：
代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test"%>
<%@ Register Assembly="DevExpress.Web.ASPxGridView.v9.1, Version=9.1.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dxwgv"%>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v9.1, Version=9.1.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dxe"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<dxwgv:ASPxGridView ID="grid" runat="server" AutoGenerateColumns="False" KeyFieldName="CategoryID"
OnRowDeleting="grid_RowDeleting" OnRowInserting="grid_RowInserting" OnRowUpdating="grid_RowUpdating">
<Columns>
<dxwgv:GridViewCommandColumn VisibleIndex="0">
<EditButton Visible="True">
</EditButton>
<NewButton Visible="True">
</NewButton>
<DeleteButton Visible="True">
</DeleteButton>
</dxwgv:GridViewCommandColumn>
<dxwgv:GridViewDataTextColumn VisibleIndex="1" FieldName="CategoryID" Caption="CategoryID"
ReadOnly="true">
</dxwgv:GridViewDataTextColumn>
<dxwgv:GridViewDataTextColumn VisibleIndex="2" FieldName="CategoryName" Caption="CategoryName">
</dxwgv:GridViewDataTextColumn>
<dxwgv:GridViewDataTextColumn VisibleIndex="3" FieldName="Description" Caption="Description ">
</dxwgv:GridViewDataTextColumn>
</Columns>
</dxwgv:ASPxGridView>
</div>
</form>
</body>
</html>
2、cs：
代码 using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using DevExpress.Web.ASPxGridView; using System.Data.SqlClient; public partial class test : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { GetData(grid); } } protected void GetData(ASPxGridView grid) { grid.DataSource = SqlHelper.ExecuteDataset(System.Data.CommandType.Text, "select * from categories"); grid.DataBind(); } protected void UpdateData(object CategoryID, object CategoryName, object Description) { string sql = String.Format("Update categories set CategoryName='{0}',Description='{1}' where CategoryID={2}", CategoryName, Description, CategoryID); SqlHelper.ExecuteNonQuery(System.Data.CommandType.Text,sql); } protected void InsertData(object CategoryID, object CategoryName, object Description) { string sql = String.Format("insert into categories (CategoryName,Description) values ('{0}','{1}')", CategoryName, Description); SqlHelper.ExecuteNonQuery(System.Data.CommandType.Text,sql); } protected void DeleteData(object CategoryID) { string sql = String.Format("delete from categories where CategoryID={0}", CategoryID); SqlHelper.ExecuteNonQuery(System.Data.CommandType.Text,sql); } protected void grid_RowUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e) { UpdateData(e.OldValues["CategoryID"], e.NewValues["CategoryName"], e.NewValues["Description"]); e.Cancel = true; (sender as ASPxGridView).CancelEdit(); GetData((sender as ASPxGridView)); } protected void grid_RowDeleting(object sender, DevExpress.Web.Data.ASPxDataDeletingEventArgs e) { DeleteData(e.Keys[0]); e.Cancel = true; GetData((sender as ASPxGridView)); } protected void grid_RowInserting(object sender, DevExpress.Web.Data.ASPxDataInsertingEventArgs e) { InsertData(e.NewValues["CategoryID"], e.NewValues["CategoryName"], e.NewValues["Description"]); e.Cancel = true; (sender as ASPxGridView).CancelEdit(); GetData((sender as ASPxGridView)); } }
3、db script (SQL Server)：
代码 if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Categories]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[Categories] GO CREATE TABLE [dbo].[Categories] ( [CategoryID] [int] IDENTITY (1, 1) NOT NULL , [CategoryName] [nvarchar] (15) COLLATE Chinese_PRC_CI_AS NOT NULL , [Description] [ntext] COLLATE Chinese_PRC_CI_AS NULL , [Picture] [image] NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]GOALTER TABLE [dbo].[Categories] WITH NOCHECK ADD CONSTRAINT [PK_Categories] PRIMARY KEY CLUSTERED ( [CategoryID] ) ON [PRIMARY] GO CREATE INDEX [CategoryName] ON [dbo].[Categories]([CategoryName]) ON [PRIMARY] GO insert into categories(CategoryName, Description) select 'Beverages','Soft drinks, coffees, teas, beers, and ales'; insert into categories(CategoryName, Description) select 'Condiments','Sweet and savory sauces, relishes, spreads, and seasonings'; insert into categories(CategoryName, Description) select 'Confections','Desserts, candies, and sweet breads'; insert into categories(CategoryName, Description) select 'Dairy Products','Cheeses'; insert into categories(CategoryName, Description) select 'Grains/Cereals','Breads, crackers, pasta, and cereal'; insert into categories(CategoryName, Description) select 'Meat/Poultry','Prepared meats'; insert into categories(CategoryName, Description) select 'Produce','Dried fruit and bean curd'; insert into categories(CategoryName, Description) select 'Seafood','Seaweed and fish';
