將JSON發佈到WCF REST端點

Question

我正在爲我的服務實現PUT，POST和DELETE。但每次我嘗試發送一些json到服務器時，都會收到錯誤「無法創建抽象類」。我生成我的請求數據，通過運行我的對象的實例通過DataContractJsonSerializer，添加__type字段，並將其封裝在{「obj」中：mydata}。

我可以運行這一回通過DataContractJsonSerializer期望一個BaseObj和正常工作：

{"__type":"RepositoryItem:http:\/\/objects\/","Insert_date":null,"Modified_date":null,"insert_by":null,"last_modify_user_id":null,"modified_by":null, "external_id":"1234","internal_id":54322,"school_id":45,"type_name":0, "vendor_id":57} 

我的服務合同飾有ServiceKnownType屬性與RepositoryItem和BaseObj列入名單。

我使用jQuery

 $.ajax({ 
      type: "POST", 
      url: "http://localhost/slnSDK/service.svc/create/repositoryitem.json?t=" + token, 
      data: data, 
      success: function(result) { 
       $("#input").html(result); 
      }, 
      error: function(xhr, result, err) { 
       $("#htmloutput").html(xhr.responseText); 
      }, 
      dataType: "json", 
      contentType: "application/json" 
     }); 

我有以下端點公開貼文：

<OperationContract(Action:=Api2Information.Namespace & "createJson")> _ 
<WebInvoke(Method:="POST", _ 
      BodyStyle:=WebMessageBodyStyle.Bare, _ 
      RequestFormat:=WebMessageFormat.Json, _ 
      responseFormat:=WebMessageFormat.Json, _ 
      UriTemplate:="/create/{objType}.json?t={token}")> _ 
Function createJson(ByVal objType As String, ByVal obj As BaseObj, ByVal token As String) As Integer 

而下面的對象（IBaseObj被省略，因爲它可以通過其實現者推斷）

<DataContract(Namespace:="http://objects/")> _ 
Public Class RepositoryItem : Inherits BaseObj 

    ' members backing properties have been omitted. 

    Public Sub New() 
    ... 

    <DataMember()> _ 
    Public Property type_name() As eType 
    ... 

    ' Override this to expose it as a property on the WebAPI 
    <DataMember()> _ 
    Public Overrides Property internal_id() As Integer? 
    ... 

    <DataMember()> _ 
    Public Property external_id() As String 
    ... 

    <DataMember()> _ 
    Public Property vendor_id() As Integer 
    ... 

End Class 

<DataContract(Namespace:="http://objects/")> _ 
<Serializable()> _ 
Public MustInherit Class BaseObj : Implements IBaseObj 

    ' members backing properties have been omitted. 

    <DataMember()> _ 
    Public Overridable Property insert_by() As String Implements IBaseObj.Insert_by 
    ... 

    <DataMember()> _ 
    Public Overridable Property Insert_date() As Nullable(Of Date) Implements IBaseObj.Insert_date 
    ... 

    <DataMember()> _ 
    Public Overridable Property modified_by() As String Implements IBaseObj.Modified_by 
    ... 

    <DataMember()> _ 
    Public Overridable Property Modified_date() As Nullable(Of Date) Implements IBaseObj.Modified_date 
    ... 

    <DataMember()> _ 
    Public Overridable Property last_modify_user_id() As Nullable(Of Integer) Implements IBaseObj.Last_modify_user_id 
    ... 

End Class 

POST的提琴手輸出：

POST http://localhost/slnSDK/service.svc/create/repositoryitem.json?t= HTTP/1.1 
Host: localhost 
Connection: keep-alive 
Referer: http://localhost/apitest.html 
Content-Length: 265 
Origin: http://localhost 
X-Requested-With: XMLHttpRequest 
Content-Type: application/json 
Accept: application/json, text/javascript, */*; q=0.01 
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) RockMelt/0.8.36.79 Chrome/7.0.517.44 Safari/534.7 
Accept-Encoding: gzip,deflate,sdch 
Accept-Language: en-US,en;q=0.8 
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 
Cookie: ASP.NET_SessionId=ywyooz45mi3c4d55h4ld4bec; x=lHOtsYBHvS/fKE7JQWzFTw==; y=XhfNVfYYQynJrIZ/odWFOg== 

{"obj":{"__type":"RepositoryItem:http:\/\/objects\/","Insert_date":null,"Modified_date":null,"insert_by":null,"last_modify_user_id":null,"modified_by":null, "external_id":"1234","internal_id":54322,"school_id":45,"type_name":0, "vendor_id":57}} 

任何幫助，你可以提供將是偉大的。謝謝！

Answer 1

信息的卷好，但總是一個很難遠程調試，一對夫婦提示：

去除提琴手尖端（因爲我可以看到你正在使用它）

在你的Ajax後：

success: function(result) { 
     $("#input").html(result); 
    }, 

您應該使用result.d得到的消息內容。

success: function(result) { 
     $("#input").html(result.d); 
    }, 

的insert_by字段是在調試消息無效，從它並不像空的片段是可接受的（如字符串？而不是作爲字符串）。