用Web Service或WCF返回JSON

1. asmx

给类加[System.Web.Script.Services.ScriptService]属性

给方法加[ScriptMethod(ResponseFormat = ResponseFormat.Json)]

web.config，在httpHandler中有两个节点很重要：

<remove verb="*" path="*.asmx"/>

<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

注意：HTTP Header的方法 GET, POST, PUT ..., 及Content-Type: application/json; charset=utf-8

2.WCF

SVC文件

[ServiceContract(Namespace = "")]

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

public class ProductService

{

// Add [WebGet] attribute to use HTTP GET

[OperationContract]

[WebInvoke(ResponseFormat = WebMessageFormat.Json, Method = "GET", UriTemplate = "/FindByCategoryId?categoryId={categoryId}")]

public List<Product> FindByCategoryId(int categoryId)

{

return ProductHandler.FindByCategoryId(categoryId);

}

}

注意：为Product类加[DataContract]属性，为属性加[DataMember]属性

建议：使用WCF输出的JSON更为完美