使用Atlas我们可以调用两种服务端的方法WebService Method和Page Method,在前面的使用中,我们一直都是调用WebService Method,如何去调用一个Page Method?本文将简单的介绍一下这一内容。
主要内容
1.如何调用Page Method
2.与WebService Method区别
一.如何调用Page Method
使用Atlas我们可以调用两种服务端的方法WebService Method和Page Method,在前面的使用中,我们一直都是调用WebService Method,如何去调用一个Page Method?本文将简单的介绍一下这一内容。
1.在页面的.cs文件中,我们先定义一个public的方法:
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再为这个方法加上WebMethod的特性,注意这一切我们都是在普通的ASPX页面中书写,而不是在.ASMX中:
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2.加入ScriptManager控件,这时候因为是Page Method,所以不再需要引入Web Service了
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3.添加HTML控件
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4.编写JS代码调用,注意PageMethods这个类,方法EchoString仍然没变,但它却属于PageMethods类,所有的页面暴露的Page Method都应该属于PageMethods。
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编译运行:
调用后:
二.与WebService Method区别
通过上面的例子大家可能看到了,似乎这种方式与调用WebService Method在PageMethods那儿有一点不同之外,其他的都差不多,为什么还会出现这种方式呢?现在如果我们需要在Web Method里面调用页面上的控件,那这种方式就很有价值了,对上面的例子作一下小小的改动,首先对TextBox加上runat=server属性,让它运行在服务端:
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再修改Page Method如下:
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调用的JS代码:
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运行后调用:
可以看到,在Page Method中,我们获取到了运行在服务端的TextBox的值。如果是在WebServer Method中,就不能再这样来实现了,这一点我想就是Page Method最大的价值吧。同时对于WebService Method和Page Method的工作原理也有很大的区别,看看Dflying Chen的解释:
对于Atlas调用Web Service来说,当请求被发送时候,仅仅简单传给服务器方法的参数数据。而对于Atlas调用Page Method来说,传输的数据将会很多,将把表单中所有的域,包括ViewState,一起传送到服务器。在服务器端,它的工作方式也和普通的PostBack很相似:在这个Page Method被调用前,所有的服务器控件将得到它自身的状态。这也正是为什么Page Method中可以访问页面中控件状态的原因。
在实际使用中,我们也是尽可能多的使用WebService Method,只在必要的时候才使用Page Method。