回复于JSONP使用jQuery和WCF [英] Response.Write JSONP using JQuery and WCF

问题描述

更新：

的服务不能被激活，因为它不支持ASP.NET兼容性。 ASP.NET兼容性为该应用程序启用。关闭ASP.NET兼容模式在web.config或AspNetCompatibilityRequirements属性添加到与RequirementsMode设置的服务类型为允许或必需。

当我尝试访问WCF服务我得到这个错误：原因是HttpContext.Current为null，我应该在这种情况下怎么办？任何帮助吗？

对象引用未设置到对象的实例。的

  System.Web.Script.Serialization.JavaScriptSerializer S =新System.Web.Script.Serialization.JavaScriptSerializer（）;
        人p =新的Person（）{名字=名字，姓氏=姓氏};
        串JSON = s.Serialize（对）;
        System.Web.HttpContext.Current.Response.Write（jsoncallback+ JSON）;} //错误
 

解决方案

的HttpContext 是一个ASP.Net结构。如果你希望能够访问它在你的服务，那么你就需要启用 ASP .NET兼容性的为您服务。

无论是通过在web.config：

 ＆LT; system.serviceModel＆GT;
        ＆LT; serviceHostingEnvironment aspNetCompatibilityEnabled =真/＆GT;
＆LT; /system.serviceModel>
 

或者声明：

<$p$p><$c$c>[AspNetCompatibilityRequirements(RequirementsMode=AspNetCompatibilityRequirementsMode.Required)]
公共类为MyService：IMyService {...}

UPDATE:

The service cannot be activated because it does not support ASP.NET compatibility. ASP.NET compatibility is enabled for this application. Turn off ASP.NET compatibility mode in the web.config or add the AspNetCompatibilityRequirements attribute to the service type with RequirementsMode setting as 'Allowed' or 'Required'.

when i try to access wcf service i get this error: the reason is HttpContext.Current is null, what should i do in this case? any help?

Object reference not set to an instance of an object.

 System.Web.Script.Serialization.JavaScriptSerializer s = new            System.Web.Script.Serialization.JavaScriptSerializer();
        Person p = new Person() { FirstName = "First name", LastName= "last name" };
        string json = s.Serialize(p);
        System.Web.HttpContext.Current.Response.Write("jsoncallback" + json);} //error

解决方案

HttpContext is an ASP.Net construct. If you want to be able to access it in your service, then you need to enable ASP.Net Compatibility for your service.

Either through the web.config:

<system.serviceModel>
        <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />  
</system.serviceModel>

Or declaratively:

[AspNetCompatibilityRequirements(RequirementsMode=AspNetCompatibilityRequirementsMode.Required)]  
public class MyService : IMyService { ... }

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