什么是从JavaScript调用一些业务逻辑上使用AJAX客户端的最有效的方法是什么？它看起来像你可以从JavaScript（在我的情况我使用jQuery来助阵）调用[WebMethod的]在一个aspx直接或者你可以直接调用的.asmx。其中要求会带来较少的开销？什么是最好的做法是什么？

What is the most efficient way of calling some business logic from javascript on the client side using AJAX? It looks like you can call a [WebMethod] on an aspx directly from javascript (in my case I'm using JQuery to help out) OR you can call a .asmx directly. Which call incurs less overhead? What is the best practice?

此外，什么是[ScriptService]属性做一个类？我从来没有在我的.aspx用这个[WebMethod的方法和一切似乎是工作的罚款。

Also, what does the [ScriptService] attribute do on a class? I have never used this before on my .aspx [WebMethod] methods and everything seems to be working fine.

我希望这是一个纯粹的客观问题。在此先感谢！

I'm hoping this is a purely objective question. Thanks in advance!

推荐答案

在ScriptService的东西，在我看来是一个隐藏的宝石在asp.net中。调用脚本进行维修，不要回传表单数据+视图状态，他们是瘦，快速JSON的有效载荷。

The ScriptService stuff in my opinion is a hidden gem in asp.net. Calls to the script service do not passback form data + viewstate, they are lean, fast JSON payloads.

继承人的最好的部分，ASP.NET3.5的ScriptManager的你能就产生一个JS适合你的方法调用，并建立所需要的任何JS类做的大部分工作。

Heres the best part, ASP.NET3.5's scriptmanager can do most of the work for you regarding generating a JS method for you to call and also setting up any JS classes needed.

一个简单的例子，包括获取信息的一个人，假设人是一个C＃类。

A simple example for fetching details for a "Person", assuming Person is a C# class.

在PersonService.asmx：

namespace MyProj.Services {
  [System.Web.Script.Services.ScriptService]
  [System.Web.Script.Services.GenerateScriptType(typeof(Person))] 
  public class PersonService : System.Web.Services.WebService
  {
    [WebMethod, ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
    public Person GetPersonDetails(int id)
    { 
       /* return Logic here */
    }
  }
}

在DetailsPage.aspx

<asp:ScriptManager ID="ScriptManager1" runat="server">
 <Services>
  <asp:ServiceReference Path="~/Services/PersonService.asmx" />
 </Services>
</asp:ScriptManager>

通过使用这样的设置，你甚至不会需要的JQuery的帮助来调用服务，并取回一个JS版本的C＃Person类的功能，.NET也为你所有。 使用从JS这种服务的一个例子是：

By using a setup like this, you won't even need the help of JQuery to call the service and get back a JS version of your C# Person class, .net does that all for you. An example of using this service from JS would be:

MyProj.Services.PersonService.GetPersonDetails(id, _onDetailsCallbackSuccess, _requestFailed, null);

_onDetailsCallbackSuccess: function(result, userContext, methodName) {
 //all persons properties are now intact and available
 document.getElementById('txtFirstname').value = result.Firtname;
}

无论如何，这将是更多的则值得探讨的ASP.NET AJAX ScriptService的东西。即使你不打算使用它这一次它是一个pretty的邪恶的功能。

Anyway, it would be more then worth looking into the ASP.NET Ajax ScriptService stuff. Even if you decide not to use it this time it's a pretty wicked feature.

链接

看起来像使用scriptservice的一个很好的基础的例子：http://www.jankoatwarpspeed.com/post/2008/05/14/asp-net-ajax-basics-calling-scriptservices-using-javascript.aspx 在ASP.NET AJAX扩展器，以整合阿贾克斯到您的控制下一个合乎逻辑的步骤。 http://weblogs.asp.net/scottgu/archive/2007/08/19/using-asp-net-ajax-control-extenders-in-vs-2008.aspx Looks like a nice basic example of using a scriptservice: http://www.jankoatwarpspeed.com/post/2008/05/14/asp-net-ajax-basics-calling-scriptservices-using-javascript.aspx ASP.NET Ajax Extenders, the next logical steps to integrating Ajax into your controls. http://weblogs.asp.net/scottgu/archive/2007/08/19/using-asp-net-ajax-control-extenders-in-vs-2008.aspx