深入剖析微软ASP.NET Ajax中的数据绑定构架下篇之一

//……
using System.ComponentModel;
using System.Web.Script.Services;
using Microsoft.Web.Preview.Services;
//……
[ScriptService]
public class EmployeeDataService : DataService
{
static List _data;
static int _nextId;
static object _dataLock = new object();
private static List Data
{
get
{
if (_data == null)
{
lock (_dataLock)
{
if (_data == null)
{
_data = new List();
_data.Add(new Employees(0，

"John Smitch"，"1970 Napa Ct."));
_data.Add(new Employees(1，

"Mary Smitch"，"9833 Mt. Dias Blv."));
_data.Add(new Employees(2，

"Mike Jodan"，"7484 Roundtree Drive"));
_data.Add(new Employees(3，

"Ronald Adina"，"9539 Glenside Dr"));
_data.Add(new Employees(4，

"Blue Yonder Airlines"，"1226 Shoe St."));
_data.Add(new Employees(5，

"Milton Albury"，"1399 Firestone Drive"));
_data.Add(new Employees(6，

"Phyllis Allen"，"5672 Hale Dr."));
_data.Add(new Employees(7，

"Stanley Alan"，"6387 Scenic Avenue"));
_data.Add(new Employees(8， "Alexander Berger"，

"8713 Yosemite Ct."));
_nextId = 9;
}
}
}
return _data;
}
}
[WebMethod]
[DataObjectMethod(DataObjectMethodType.Delete)]
public void DeleteRecords(int id)
{
foreach (Employees row in _data)
{
if (row.Id == id)
{
lock (_dataLock)
{
_data.Remove(row);
}
break;
}
}
}
[WebMethod]
[DataObjectMethod(DataObjectMethodType.Select)]
public Employees[] SelectRecords()
{
return EmployeeDataService.Data.ToArray();
}
[WebMethod]
[DataObjectMethod(DataObjectMethodType.Insert)]
public Employees InsertRecords(string name， string Address)
{
Employees newRow;
lock (_dataLock)
{
newRow = new Employees(_nextId++， name， Address);
_data.Add(newRow);
}
return newRow;
}
[WebMethod]
[DataObjectMethod(DataObjectMethodType.Update)]
public void UpdateRecords(Employees updateRow)
{
foreach (Employees row in _data)
{
if (row.Id == updateRow.Id)
{
row.Name = updateRow.Name;
row.Address = updateRow.Address;
break;
}
}
}
}
public class Employees
{
private int _id;
private string _name;
private string _address;
[DataObjectField(true， true)]
public int Id
{
get { return _id; }
set { _id = value; }
}
[DataObjectField(false)]
[DefaultValue("")]
public string Name
{
get { return _name; }
set { _name = value; }
}
[DataObjectField(false)]
[DefaultValue("")]
public string Address
{
get { return _address; }
set { _address = value; }
}
public Employees()
{
_id = -1;
}
public Employees(int id， string name， string address)
{
_id = id;
_name = name;
_address = address;
}
}

public DataTable GetData(object parameters， string loadMethod);
public DataTable SaveData(ChangeList changeList，

object parameters，string loadMethod);

<script type="text/xml-script">
<page xmlns=" [url]http://schemas.microsoft.com/xml-script/2005[/url]">
<components>
<dataSource id="EmployeeDataSource"
serviceURL="EmployeeDataService.asmx" >
</dataSource>
<listView id="searchResults"
itemTemplateParentElementId="searchResults_layoutTemplate" >
<bindings>
<binding dataContext="EmployeeDataSource"
dataPath="data" property="data" />
</bindings>
<layoutTemplate>
<template layoutElement="searchResults_layoutTemplate" />
</layoutTemplate>
<itemTemplate>
<template layoutElement="searchResults_itemTemplate">
<label id="searchResults_ID">
<bindings>
<binding dataPath="Id" transform="Add"
property="text" />
</bindings>
</label>
<label id="searchResults_Name">
<bindings>
<binding dataPath="Name" property="text" />
</bindings>
</label>
<label id="searchResults_Address">
<bindings>
<binding dataPath="Address" property="text" />
</bindings>
</label>
</template>
</itemTemplate>
<separatorTemplate>
<template
layoutElement="searchResults_separatorTemplate" />
</separatorTemplate>
<emptyTemplate>
<template layoutElement="NoDataTemplate" />
</emptyTemplate>
</listView>
<application>
<load>
<invokeMethodAction target="EmployeeDataSource"
method="load" />
</load>
</application> 
</components>
</page>
</script>