DevExpress ASP.NET 使用经验谈（8）-ASPxGridView自定义列和基本事件
为演示本节示例，我们在原来Users表增加【性别Gender】、【兴趣爱好Hobbies】，【CreateTime创建时间】，【ModifyTime】修改时间这4个字段，
ALTER TABLE [dbo].[Users] add [Gender] varchar(10) NULL GO ALTER TABLE [dbo].[Users] add [Hobbies] varchar(50) NULL GO ALTER TABLE [dbo].[Users] add [CreateTime] datetime NULL GO ALTER TABLE [dbo].[Users] add [ModifyTime] datetime NULL
完成建表语句如下：
CREATE TABLE [dbo].[Users] (
[UserID] int IDENTITY(1, 1) NOT NULL,
[UserName] nvarchar(50) NULL,
[FirstName] nvarchar(50) NULL,
[LastName] nvarchar(50) NULL,
[MiddleName] nvarchar(50) NULL,
[EmailID] nvarchar(50) NULL,
[Gender] varchar(10) NULL,
[Hobbies] varchar(50) NULL,
[ModifyTime] datetime NULL,
[CreateTime] datetime NULL,
CONSTRAINT [PK_Users] PRIMARY KEY ([UserID])
)
【性别】：我们选择ASPxGridView的GridViewDataComboBoxColumn列类型，通过如下代码实现下拉选择性别“男”和“女”。
<dx:GridViewDataComboBoxColumn FieldName="Gender" VisibleIndex="6" Caption="性别" Width="80px">
<EditFormSettings VisibleIndex="4" Visible="True" Caption="性别" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
<PropertiesComboBox>
<Items>
<dx:ListEditItem Text="男" Value="男" />
<dx:ListEditItem Text="女" Value="女" />
</Items>
</PropertiesComboBox>
</dx:GridViewDataComboBoxColumn>
【兴趣爱好】：通过编辑模板EditItemTemplate，建立自定义的兴趣爱好CheckBox选项的模板列。
<dx:GridViewDataTextColumn FieldName="Hobbies" VisibleIndex="7" Caption="兴趣爱好" Width="100px">
<EditFormSettings VisibleIndex="5" Visible="True" Caption="兴趣爱好" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
<EditItemTemplate>
<table border="0">
<tr>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H1" runat="server" ClientInstanceName="cb_hob1" Text="阅读" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
<td> </td>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H2" ClientInstanceName="cb_hob2" runat="server" Text="思考" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
<td> </td>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H3" runat="server" ClientInstanceName="cb_hob3" Text="运动" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
<td> </td>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H4" runat="server" ClientInstanceName="cb_hob4" Text="社交" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
</tr>
</table>
</EditItemTemplate>
</dx:GridViewDataTextColumn>
【 创建时间】与【修改时间】在界面上均不显示，分别记录每条数据的创建时间和最后一次修改时间。
<dx:GridViewDataDateColumn FieldName="CreateTime" VisibleIndex="7" Caption="创建时间" Width="100px" Visible="false">
<EditFormSettings VisibleIndex="5" Visible="False" Caption="创建时间" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataDateColumn>
<dx:GridViewDataDateColumn FieldName="ModifyTime" VisibleIndex="7" Caption="修改时间" Width="100px" Visible="false">
<EditFormSettings VisibleIndex="5" Visible="True" Caption="修改时间" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataDateColumn>
关于这4个字段的后台赋值，我们暂先放一边，来看一下，目前编辑界面的效果。
图一 添加字段后的编辑页
【性别】字段，可以直接下拉选择并保存，但是【兴趣爱好】选项选取后保存无效，【创建时间】，【修改时间】因为并未开放编辑，且后台并未赋值，
所以仍为空值。那么如何才能保存这三个字段呢？
这里我们就要利用ASPxGridView的OnRowInserting事件、OnRowUpdating事件来执行赋值和保存。
后台OnRowInserting事件代码如下：
protected void ASPxGridView1_RowInserting(object sender, DevExpress.Web.Data.ASPxDataInsertingEventArgs e)
{
//在RowInserting时，将当前时间赋值给“创建时间列”CreateTime赋值
e.NewValues["CreateTime"] = DateTime.Now;
GridViewDataColumn columnHobbies = ASPxGridView1.Columns["Hobbies"] as GridViewDataColumn; //取出GridView的Column
//通过ASPxGridView1.FindEditRowCellTemplateControl找出自定义的CheckBox
ASPxCheckBox cbH1 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H1") as ASPxCheckBox);
ASPxCheckBox cbH2 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H2") as ASPxCheckBox);
ASPxCheckBox cbH3 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H3") as ASPxCheckBox);
ASPxCheckBox cbH4 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H4") as ASPxCheckBox);
ArrayList listHobbies = new ArrayList();
if (cbH1.Checked == true)
{
listHobbies.Add(cbH1.Text);
}
if (cbH2.Checked == true)
{
listHobbies.Add(cbH2.Text);
}
if (cbH3.Checked == true)
{
listHobbies.Add(cbH3.Text);
}
if (cbH4.Checked == true)
{
listHobbies.Add(cbH4.Text);
}
//通过 e.NewValues["Hobbies"]赋值
e.NewValues["Hobbies"] = string.Join(",", listHobbies.ToArray());
}
我们可以通过e.NewValues["列名"]赋值来存取数据，通过ASPxGridView1.FindEditRowCellTemplateControl方法，可以找到模板列中的
自定义控件。
同理，后台RowUpdating事件如下：
protected void ASPxGridView1_RowUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e)
{
//在RowUpdating时，将当前时间赋值给“创建时间列”ModifyTime赋值
e.NewValues["ModifyTime"] = DateTime.Now;
GridViewDataColumn columnHobbies = ASPxGridView1.Columns["Hobbies"] as GridViewDataColumn;//取出GridView的Column
//通过ASPxGridView1.FindEditRowCellTemplateControl找出自定义的CheckBox
ASPxCheckBox cbH1 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H1") as ASPxCheckBox);
ASPxCheckBox cbH2 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H2") as ASPxCheckBox);
ASPxCheckBox cbH3 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H3") as ASPxCheckBox);
ASPxCheckBox cbH4 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H4") as ASPxCheckBox);
ArrayList listHobbies = new ArrayList();
if (cbH1.Checked == true)
{
listHobbies.Add(cbH1.Text);
}
if (cbH2.Checked == true)
{
listHobbies.Add(cbH2.Text);
}
if (cbH3.Checked == true)
{
listHobbies.Add(cbH3.Text);
}
if (cbH4.Checked == true)
{
listHobbies.Add(cbH4.Text);
}
//通过 e.NewValues["Hobbies"]赋值
e.NewValues["Hobbies"] = string.Join(",", listHobbies.ToArray());
}
通过上面代码，我们已经能将【兴趣爱好】、【创建时间】、【修改时间】的数据保存到数据库，但是再次编辑时，【兴趣爱好】列数据并未绑定控件，
这时，就需要用到ASPxCheckBox控件的OnInit事件。
<dx:ASPxCheckBox ID="ASPxCheckBox_H2" ClientInstanceName="cb_hob2" runat="server" Text="思考" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init"> </dx:ASPxCheckBox>
ASPxCheckBox_Hobbies_Init事件代码如下：
protected void ASPxCheckBox_Hobbies_Init(object sender, EventArgs e)
{
ASPxCheckBox cblHb = sender as ASPxCheckBox;
GridViewEditItemTemplateContainer container = cblHb.NamingContainer as GridViewEditItemTemplateContainer;
string strHobbies = string.Empty;
if (DataBinder.Eval(container.DataItem, "Hobbies") != null)
strHobbies = DataBinder.Eval(container.DataItem, "Hobbies").ToString().Trim();
if (strHobbies.Contains(cblHb.Text))
{
cblHb.Checked = true;
}
}
此时，我们新增一条数据，录入信息如下，点击保存，再次点击编辑图标打开编辑界面，已经显示【兴趣爱好】列的选择状态数据绑定，因为是
新增数据，所以【修改时间】为空。
图二 增加后台取值赋值代码，执行新增并保存后的界面
再次编辑，修改【兴趣爱好】选项，取消“运动“选项，增加”思考“选项，再保存，这时【修改时间】更新。
图三 再执行编辑并保存后的界面
最后贴出完整代码：
1、前台ASPX页面代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="DevExpress.Xpo.v12.2.Web, Version=12.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Xpo" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.v12.2, Version=12.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.v12.2, Version=12.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dx" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<p>
<h1>ASPxGridView自定义列和事件</h1>
</p>
<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False"
OnRowInserting="ASPxGridView1_RowInserting"
OnRowUpdating="ASPxGridView1_RowUpdating"
DataSourceID="XpoDataSource1" KeyFieldName="UserID" Theme="Aqua">
<Columns>
<dx:GridViewCommandColumn VisibleIndex="0" ButtonType="Image" Width="80px">
<EditButton Visible="true">
<Image ToolTip="编辑" Url="Assets/images/edit.png"></Image>
</EditButton>
<NewButton Visible="true">
<Image ToolTip="新增" Url="Assets/images/new.png"></Image>
</NewButton>
<DeleteButton Visible="true">
<Image ToolTip="删除" Url="Assets/images/delete.png"></Image>
</DeleteButton>
<UpdateButton Visible="true">
<Image ToolTip="保存" Url="Assets/images/save.gif"></Image>
</UpdateButton>
<CancelButton Visible="true">
<Image ToolTip="取消" Url="Assets/images/cancel.gif"></Image>
</CancelButton>
</dx:GridViewCommandColumn>
<dx:GridViewDataTextColumn FieldName="UserID" ReadOnly="True" VisibleIndex="1" Visible="false">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="UserName" VisibleIndex="2" Caption="用户姓名" >
<EditFormSettings VisibleIndex="2" Visible="True" Caption="用户姓名" />
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="FirstName" VisibleIndex="3" Caption="名" Width="80px">
<EditFormSettings VisibleIndex="3" Visible="True" Caption="名" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="LastName" VisibleIndex="4" Caption="姓" Width="80px">
<EditFormSettings VisibleIndex="4" Visible="True" Caption="姓" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="MiddleName" VisibleIndex="5" Caption="教名" Width="100px">
<EditFormSettings VisibleIndex="5" Visible="False" Caption="教名" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataTextColumn>
<dx:GridViewDataComboBoxColumn FieldName="Gender" VisibleIndex="6" Caption="性别" Width="80px">
<EditFormSettings VisibleIndex="4" Visible="True" Caption="性别" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
<PropertiesComboBox>
<Items>
<dx:ListEditItem Text="男" Value="男" />
<dx:ListEditItem Text="女" Value="女" />
</Items>
</PropertiesComboBox>
</dx:GridViewDataComboBoxColumn>
<dx:GridViewDataTextColumn FieldName="Hobbies" VisibleIndex="7" Caption="兴趣爱好" Width="100px">
<EditFormSettings VisibleIndex="5" Visible="True" Caption="兴趣爱好" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
<EditItemTemplate>
<table border="0">
<tr>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H1" runat="server" ClientInstanceName="cb_hob1" Text="阅读" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
<td> </td>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H2" ClientInstanceName="cb_hob2" runat="server" Text="思考" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
<td> </td>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H3" runat="server" ClientInstanceName="cb_hob3" Text="运动" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
<td> </td>
<td>
<dx:ASPxCheckBox ID="ASPxCheckBox_H4" runat="server" ClientInstanceName="cb_hob4" Text="社交" Layout="Flow" OnInit="ASPxCheckBox_Hobbies_Init">
</dx:ASPxCheckBox>
</td>
</tr>
</table>
</EditItemTemplate>
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="EmailID" VisibleIndex="6" Caption="邮箱" Width="200px">
<EditFormSettings VisibleIndex="6" Visible="True" Caption="邮箱" ColumnSpan="2" />
</dx:GridViewDataTextColumn>
<dx:GridViewDataDateColumn FieldName="CreateTime" VisibleIndex="7" Caption="创建时间" Width="100px" >
<EditFormSettings VisibleIndex="5" Visible="False" Caption="创建时间" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataDateColumn>
<dx:GridViewDataDateColumn FieldName="ModifyTime" VisibleIndex="7" Caption="修改时间" Width="100px" >
<EditFormSettings VisibleIndex="5" Visible="False" Caption="修改时间" />
<CellStyle HorizontalAlign="Center" />
<HeaderStyle HorizontalAlign="Center" />
</dx:GridViewDataDateColumn>
</Columns>
<SettingsBehavior ConfirmDelete="true" AllowFocusedRow="true" AllowSelectSingleRowOnly="true" AllowSelectByRowClick="true" />
<SettingsEditing EditFormColumnCount="2" />
<Settings ShowFooter="True" />
<SettingsText EmptyDataRow="无记录" ConfirmDelete="确定删除吗？" />
<SettingsPager Mode="ShowPager" PageSize="3" />
</dx:ASPxGridView>
</div>
<dx:XpoDataSource ID="XpoDataSource1" runat="server" TypeName="XPOModel.DemoDB.Users"></dx:XpoDataSource>
</form>
</body>
</html>
2、后台代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using DevExpress.Xpo;
using DevExpress.Xpo.DB;
using DevExpress.Web.ASPxGridView;
using DevExpress.Web.ASPxEditors;
using System.Collections;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Init(object sender, EventArgs e)
{
string provider = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;//获取数据库连接
IDataLayer datalayer = new SimpleDataLayer(XpoDefault.GetConnectionProvider(provider, AutoCreateOption.DatabaseAndSchema));//建立数据层XPO独有的
DevExpress.Xpo.Session session = new DevExpress.Xpo.Session(datalayer); //将数据层和会话绑定
XpoDataSource1.Session = session;
}
protected void Page_Load(object sender, EventArgs e)
{
}
protected void ASPxCheckBox_Hobbies_Init(object sender, EventArgs e)
{
ASPxCheckBox cblHb = sender as ASPxCheckBox;
GridViewEditItemTemplateContainer container = cblHb.NamingContainer as GridViewEditItemTemplateContainer;
string strHobbies = string.Empty;
if (DataBinder.Eval(container.DataItem, "Hobbies") != null)
strHobbies = DataBinder.Eval(container.DataItem, "Hobbies").ToString().Trim();
if (strHobbies.Contains(cblHb.Text))
{
cblHb.Checked = true;
}
}
protected void ASPxGridView1_RowInserting(object sender, DevExpress.Web.Data.ASPxDataInsertingEventArgs e)
{
//在RowInserting时，将当前时间赋值给“创建时间列”CreateTime赋值
e.NewValues["CreateTime"] = DateTime.Now;
GridViewDataColumn columnHobbies = ASPxGridView1.Columns["Hobbies"] as GridViewDataColumn; //取出GridView的Column
//通过ASPxGridView1.FindEditRowCellTemplateControl找出自定义的CheckBox
ASPxCheckBox cbH1 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H1") as ASPxCheckBox);
ASPxCheckBox cbH2 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H2") as ASPxCheckBox);
ASPxCheckBox cbH3 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H3") as ASPxCheckBox);
ASPxCheckBox cbH4 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H4") as ASPxCheckBox);
ArrayList listHobbies = new ArrayList();
if (cbH1.Checked == true)
{
listHobbies.Add(cbH1.Text);
}
if (cbH2.Checked == true)
{
listHobbies.Add(cbH2.Text);
}
if (cbH3.Checked == true)
{
listHobbies.Add(cbH3.Text);
}
if (cbH4.Checked == true)
{
listHobbies.Add(cbH4.Text);
}
//通过 e.NewValues["Hobbies"]赋值
e.NewValues["Hobbies"] = string.Join(",", listHobbies.ToArray());
}
protected void ASPxGridView1_RowUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e)
{
//在RowUpdating时，将当前时间赋值给“创建时间列”ModifyTime赋值
e.NewValues["ModifyTime"] = DateTime.Now;
GridViewDataColumn columnHobbies = ASPxGridView1.Columns["Hobbies"] as GridViewDataColumn;//取出GridView的Column
//通过ASPxGridView1.FindEditRowCellTemplateControl找出自定义的CheckBox
ASPxCheckBox cbH1 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H1") as ASPxCheckBox);
ASPxCheckBox cbH2 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H2") as ASPxCheckBox);
ASPxCheckBox cbH3 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H3") as ASPxCheckBox);
ASPxCheckBox cbH4 = (ASPxGridView1.FindEditRowCellTemplateControl(columnHobbies, "ASPxCheckBox_H4") as ASPxCheckBox);
ArrayList listHobbies = new ArrayList();
if (cbH1.Checked == true)
{
listHobbies.Add(cbH1.Text);
}
if (cbH2.Checked == true)
{
listHobbies.Add(cbH2.Text);
}
if (cbH3.Checked == true)
{
listHobbies.Add(cbH3.Text);
}
if (cbH4.Checked == true)
{
listHobbies.Add(cbH4.Text);
}
//通过 e.NewValues["Hobbies"]赋值
e.NewValues["Hobbies"] = string.Join(",", listHobbies.ToArray());
}
}
源码下载:http://pan.baidu.com/s/1hqziMNE
博文作者：挪威森林（Coding of life）
博文出处：http://www.cnblogs.com/allenlf/
主要研究：Web开发框架、ORM、WCF、医疗行业软件开发（HRP、EMR、CP、OA）