关键
1、在数据层创建 强类型的DataSet和TableAdapter，TableAdapter查询可以使用现有的存储过程。注：直接把表或存储过程拖进来会自动创建TableAdapter
2、中间层的类用[System.ComponentModel.DataObject]声明为数据组件，CRUD方法分别对应[DataObjectMethod(DataObjectMethodType.Insert)]，[DataObjectMethod(DataObjectMethodType.Select)]，[DataObjectMethod(DataObjectMethodType.Update)]，[DataObjectMethod(DataObjectMethodType.Delete)]
3、web层使用ObjectDataSource展现数据，ObjectDataSource就相当于一个代理。ObjectDataSource只是查找具有匹配的参数名称的方法，它不会使用参数的 Type 或 Size，而只是对参数的名称进行匹配
4、其它
·有ConvertEmptyStringToNull属性，默认是true。另外还有Direction属性
·注意的这几个属性NullDisplayText，HtmlEncode，ApplyFormatInEditMode，InsertVisible，DataFormatString，ReadOnly
·DataKeyNames有多个值的话用“,”分隔，用绑定的话给其加一个“PropertyName”属性，值类似如下“SelectedDataKey.Values[0]”
·关于绑定：简单属性<%# custID %>；集合；表达式<%# ( customer.FirstName + " " + customer.LastName ) %>；方法<%# GetBalance(custID) %>
·<%# Eval("field1") %> 和 <%# Bind("field1") %>，Eval是单向绑定，Bind是双向邦定
·有一个OldValuesParameterFormatString属性一般不用，不过如果要处理乐观并发之类的就会用到。当该属性的值为“original_{0}”的时候“original_参数名”则为初始值
·还有一些如编程方式给参数赋值，错误处理，得到返回值之类的请看源码
示例
相关存储过程和数据层略，见源码
单例模式的实现
App_Code/Singleton.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
/**////
/// Singleton 的摘要说明
///
public class Singleton where T : new()
{
public static T Instance
{
get { return SingletonCreator.instance; }
}
class SingletonCreator
{
internal static readonly T instance = new T();
}
}
中间层代码
App_Code/Test.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using TestDatabaseTableAdapters;
using System.ComponentModel;
/**////
/// Test 的摘要说明
///
[DataObject]
public class Test
{
[DataObjectMethod(DataObjectMethodType.Select, true)]
public TestDatabase.TestDataTable GetTest()
{
return Singleton.Instance.GetTest();
}
[DataObjectMethod(DataObjectMethodType.Select, false)]
public TestDatabase.TestDataTable GetTestById(int id)
{
return Singleton.Instance.GetTestById(id);
}
[DataObjectMethod(DataObjectMethodType.Insert, true)]
public int?[] InsertTest(int? parentId, string name, DateTime? publishTime, decimal? price, bool? isGood, out int? minId)
{
// 仅为说明如何做错误处理
if (String.IsNullOrEmpty(name))
throw new ArgumentException("参数不能是空", "name");
int? id = null;
int? count = null;
minId = null;
Singleton.Instance.InsertTest(parentId, name, publishTime, price, isGood, ref id, ref count, ref minId);
return new int?[] { id, count };
}
[DataObjectMethod(DataObjectMethodType.Delete, true)]
public int? DeleteTest(int id)
{
int? rowAffected;
rowAffected = Singleton.Instance.DeleteTest(id);
return rowAffected;
}
[DataObjectMethod(DataObjectMethodType.Update, true)]
public int? UpdateTest(int? id, int? parentId, string name, DateTime? publishTime, decimal? price, bool? isGood)
{
int? rowAffected;
rowAffected = Singleton.Instance.UpdateTest(id, parentId, name, publishTime, price, isGood);
return rowAffected;
}
}
DataSourceControl/Test.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Test.aspx.cs"
Inherits="DataSourceControl_Test" Title="数据源控件测试" %>
DataKeyNames="Id" DataSourceID="ObjectDataSource1" Height="50px" Width="125px" OnItemInserted="DetailsView1_ItemInserted">
SortExpression="Id" />
InsertVisible="False" />
SortExpression="Id" />
DataSourceID="ObjectDataSource1" AllowPaging="True" AllowSorting="True" OnRowUpdating="GridView1_RowUpdating">
SortExpression="Id" />
NullDisplayText="我的值是NULL" />
ReadOnly="true" />
TypeName="Test" InsertMethod="InsertTest" DeleteMethod="DeleteTest" UpdateMethod="UpdateTest"
OnInserting="ObjectDataSource1_Inserting" OnInserted="ObjectDataSource1_Inserted">
<%--ConvertEmptyStringToNull属性默认为true--%>
SelectMethod="GetTestById" TypeName="Test">
Type="Int32" />
DataSourceControl/Test.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class DataSourceControl_Test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void ObjectDataSource1_Inserting(object sender, ObjectDataSourceMethodEventArgs e)
{
// 编程方式给参数赋值
if (e.InputParameters["publishTime"] == null)
{
e.InputParameters["publishTime"] = DateTime.Now;
}
}
protected void ObjectDataSource1_Inserted(object sender, ObjectDataSourceStatusEventArgs e)
{
// 错误处理
if (e.Exception != null)
{
if (e.Exception.InnerException != null)
{
Exception inner = e.Exception.InnerException;
if (inner is ArgumentException)
{
string paramName = ((ArgumentException)inner).ParamName;
lblMsg.Text = string.Concat("参数 ", paramName, " 有问题");
}
}
}
else
{
int?[] ary = (int?[])e.ReturnValue;
lblMsg.Text = "新插入信息的ID是：" + ary[0].ToString();
lblMsg.Text += "
数据总数是：" + ary[1].ToString();
lblMsg.Text += "
最小ID是：" + e.OutputParameters["minId"].ToString();
}
}
protected void DetailsView1_ItemInserted(object sender, DetailsViewInsertedEventArgs e)
{
if (e.Exception != null)
{
// 错误已处理
e.ExceptionHandled = true;
// DetailsView保持插入状态
e.KeepInInsertMode = true;
}
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
// 价格格式转换为decimal格式
if (e.NewValues["Price"] != null)
e.NewValues["Price"] = decimal.Parse(e.NewValues["Price"].ToString(), System.Globalization.NumberStyles.Currency);
}
}
[源码下载]
作者：webabcd
