下面介绍下通过Web Service和Page 方法进行异步调用。
首先新建一个asp.net ajax 的项目，添加一个book类和author类
public class Book
{
public string Title{ get; set; }
public string Content{ get; set; }
public double Price { get; set; }
}
public class Author
{
public string Name { set; get; }
public string Description { get; set; }
}
然后添加添加一个web service ，由于webservice中没有用到Author类，所以如果想在客户端javascript用到author类的话必须加入[GenerateScriptType(typeof(Author))]
[ScriptService]
[GenerateScriptType(typeof(Author))]
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class bookService : System.Web.Services.WebService
{
[WebMethod]
public List<Book> GetBooks()
{
List<Book> books = new List<Book>();
Book book = new Book();
book.Title = "Inside C#";
book.Content = "The book is about c# knowledge";
book.Price = 56;
books.Add(book);
Book book2 = new Book();
book2.Title = "asp.net ajax in action";
book2.Content = "ajax";
book2.Price = 46;
books.Add(book2);
return books;
}
这样就可以在客户端异步调用此方法了。下面贴出aspx页面的代码及html内容
[WebMethod]
public static string HiAuthor(Author author)
{
return string.Format("Hi {0}--{1}", author.Name, author.Description);
}
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ajaxDemo._Default" %>
<!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>
<script type="text/javascript">
//通过一个按钮触发此事件进行异步调用
function getBooks() {
ajaxDemo.bookService.GetBooks(onGetBooksSuccess, onGetBooksFailure);
}
function onGetBooksSuccess(result, context, methodName) {
var sb = new Sys.StringBuilder();
for (var i = 0; i < result.length; i++) {
var book = result[i];
sb.append(book.Title + "-");
sb.append(book.Content + "-");
sb.append(book.Price + "<br/>");
}
$get("books").innerHTML = sb.toString();
}
function onGetBooksFailure(error, context, methodName) {
$get("books").innerHTML = error.get_message();
}
//客户端实例化一个实体类
function initialAuthor() {
var author = new ajaxDemo.Author();
author.Name = "Sean";
author.Description = "PageMethod";
//通过一个page 方法进行异步调用
PageMethods.HiAuthor(author, onHiAuthorSuccess);
}
function onHiAuthorSuccess(result, context, methodName) {
$get("author").innerHTML = result;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="scriptManager" runat="server" EnablePageMethods="true">
<Services>
<asp:ServiceReference Path="~/bookService.asmx" InlineScript="true" />
</Services>
</asp:ScriptManager>
<div>
<input type="button" id="GetBooks" value="Get Books" onclick="getBooks()" />
<div id="books"></div>
</div>
<input type="button" value="PageMethod" onclick="initialAuthor()" />
<div id="author"></div>
</form>
</body>
</html>
上面的两个按钮一个通过webservice的方法异步调用，一个是通过page 方法调用，在进行pagemethod的方式调用时，要不ScriptManager的EnablePageMethods的属性设置为True
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