jQuery Ajax 仿AjaxPro.Utility.RegisterTypeForAjax辅助方法

在某项目中，设计模板字段引擎，采用html+jquery实现，这里的数据就难免需要ajax获取，但是团队对于js掌握不一，所以我写了下面辅助类，可以像ajaxpro一样简化ajax的开发。
代码-jQueryInvokeMethodAttribute （此处只做标示方法处理，所以为空）：

[AttributeUsage(AttributeTargets.Method, AllowMultiple=false,Inherited=false)] 
public class jQueryInvokeMethodAttribute : Attribute 
{ 
}

代码-jQueryAjaxUtility（分注册脚本和调用ajax事件）：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
namespace Green.Utility 
{ 
public class jQueryAjaxUtility 
{ 
public static string AjaxInvokeParam = "AjaxInvoke"; 
public static string AjaxInvokeValue = "1"; 
public static string ResponseCharset = "UTF-8"; 
protected static System.Web.UI.Page Page 
{ 
get 
{ 
return System.Web.HttpContext.Current.Handler as System.Web.UI.Page; 
} 
} 
public static void RegisterClientAjaxScript(Type type) 
{ 
if (Page != null) 
{ 
if (System.Web.HttpContext.Current.Request[AjaxInvokeParam] == AjaxInvokeValue) 
{ 
RegisterAjaxInvokeEvent(type); 
} 
else 
{ 
RegisterAjaxInvokeScript(type); 
} 
} 
} 
protected static void RegisterAjaxInvokeScript(Type type) 
{ 
Page.ClientScript.RegisterClientScriptBlock(type.GetType(), type.GetType().FullName + "_" + typeof(jQueryAjaxUtility).FullName + "_AjaxInvokeDefaultOption", "window.defaultAjaxOption={type:'GET',cache:false, dataType:'text'};", true); 
if (!jQueryUtilityCache.Current.Exists(type)) 
{ 
var methodinfo = type.GetMethods(System.Reflection.BindingFlags.IgnoreCase | System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public).Where(t => 
{ 
var attrs = t.GetCustomAttributes(typeof(jQueryInvokeMethodAttribute), false); 
if (attrs != null && attrs.Length > 0) 
return true; 
return false; 
}).ToList(); 
if (methodinfo != null && methodinfo.Count > 0) 
{ 
System.Text.StringBuilder sb = new StringBuilder(); 
sb.AppendFormat(" window.{0}=function(){{}}; ", type.Name); 
methodinfo.ForEach(t => 
{ 
var parameters = t.GetParameters().Select(p => p.Name).ToArray(); 
sb.AppendFormat(" {2}.{0} = function ({1} ajaxOption) {{", t.Name, parameters.Count() > 0 ? string.Join(",", parameters) + "," : "", type.Name); 
sb.Append("if(ajaxOption==null||typeof ajaxOption=='undefined'){ajaxOption={};};"); 
var url = Page.Request.RawUrl.IndexOf("?") == -1 ? Page.Request.RawUrl : Page.Request.RawUrl.Substring(0, Page.Request.RawUrl.IndexOf("?") ); 
sb.AppendFormat("ajaxOption.url = '{0}';", url); 
var data = "''"; 
if (parameters.Count() > 0) 
{ 
data = (string.Join(" ", parameters.Select(p => string.Format("'&{0}=' + {0}+", p)).ToArray())); 
data= data.TrimEnd('+'); 
} 
sb.AppendFormat("ajaxOption.data = 'method={1}&rn={4}&{2}={3}'+{0};", data, t.Name, AjaxInvokeParam, AjaxInvokeValue,Guid.NewGuid().ToString()); 
sb.Append("ajaxOption= jQuery.extend(window.defaultAjaxOption,ajaxOption);"); 
sb.Append("jQuery.ajax(ajaxOption);};"); 
}); 
jQueryUtilityCache.Current.AddScript(type, sb.ToString()); 
} 
} 
var script = jQueryUtilityCache.Current.GetScript(type); 
Page.ClientScript.RegisterClientScriptBlock(type.GetType(), type.GetType().FullName + "_" + typeof(jQueryAjaxUtility).FullName + "_AjaxInvoke", script, true); 
} 
protected string GenertorScript(Type type) 
{ 
return string.Empty; 
} 
protected static void RegisterAjaxInvokeEvent(Type type) 
{ 
var Request = System.Web.HttpContext.Current.Request; 
var Response = System.Web.HttpContext.Current.Response; 
var method = Request["method"]; 
if (string.IsNullOrEmpty(method)) 
return; 
Response.Clear(); 
var methodinfo = type.GetMethod(method, System.Reflection.BindingFlags.IgnoreCase | System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public); 
if (methodinfo != null) 
{ 
Response.Charset = ResponseCharset; 
Response.ContentType = string.Join(",", Request.AcceptTypes); 
var param = methodinfo.GetParameters(); 
object[] objs = new object[param.Length]; 
var i = 0; 
param.ToList().ForEach(t => 
{ 
objs[i++] = Convert.ChangeType(Request[t.Name], t.ParameterType); 
}); 
var obj = methodinfo.Invoke(null, objs); 
if (obj != null) 
{ 
//序列化 
if (!obj.GetType().IsValueType && obj.GetType() != typeof(string)) 
{ 
if (Request.AcceptTypes.Contains("text/xml")) 
{ 
Response.Write(Green.Utility.SerializerUtility.XmlSerializer(obj)); 
} 
else if (Request.AcceptTypes.Contains("application/json")) 
{ 
Response.ContentType = "application/json, text/javascript, */*"; 
Response.Write(Green.Utility.SerializerUtility.JsonSerializer(obj)); 
} 
else 
{ 
Response.Write(obj); 
} 
} 
else 
{ 
Response.Write(obj); 
} 
} 
Response.Flush(); 
Response.Close(); 
Response.End(); 
} 
} 
} 
}

为了考虑反射的性能，加入了类级注册脚本方法缓存处理jQueryUtilityCache，具体见demo。
测试：
html:

<form id="form1" runat="server"> 
<div> 
<input id="Button1" type="button" value="button" /> 
</div> 
</form>

后台方法注册Page_Load

Green.Utility.jQueryAjaxUtility.RegisterClientAjaxScript(typeof(_Default));

1：
前台：

_Default.Test("ajax", 
{ 
success: function(e) { 
alert(e); 
}, 
dataType: "text" 
});

后台：

[Green.Utility.jQueryInvokeMethod()] 
public static string Test(string str) 
{ 
return "hello:" + str; 
}

效果：




2：前台ajax：

_Default.TestArrayJson(1, 2, 3, 
{ 
success: function(e) { 
$.each(e, function(i, n) { alert(n); }); 
}, 
dataType: "json" 
})

后台：

[Green.Utility.jQueryInvokeMethod()] 
public static int[] TestArrayJson(int p1, int p2, int p3) 
{ 
return new int[] { p1, p2, p3 }; 
}

效果：




3：前台ajax：

_Default.TestArrayxml("key", "value", 
{ 
success: function(e) { 
alert(e.key); 
alert(e.Value); 
}, 
dataType: "json" 
})

后台：

[Green.Utility.jQueryInvokeMethod()] 
public static Test TestArrayxml(string key,string value) 
{ 
return new Test() { key=key,Value=value}; 
}

效果：




最后看看FireBug中ajax http头信息：




附录：代码下载
作者：破 狼 (cnblogs)