.Net通過JSON綁定數據集的模型

Question

我對此有一段時間了。我肯定錯過了什麼。

我通過Angular/JSON發佈一個複雜的模型到.NET控制器。將它發回服務器時，DefaultModelBinder只能部分綁定到模型（簡單的值如int（ID）和string（title））。 「ListItems」數據集似乎被忽略，以及作爲ProjectDetails模型一部分的「ProductsList」數據表。從我正在閱讀的內容來看，對於複雜的對象，DefaultModelBinder會遞歸地在JSON中進行第二次傳遞，然後映射它可以找到的對象。我嘗試了很多通過搜索StackOverflow找到的解決方案，但無濟於事。我認爲我現在剛剛失去了我的觀點。這是我的。任何幫助將不勝感激。

模型

Public Class ProjectDetails 

    Private _ListItems As DataSet 
    <JsonProperty("ListItems")> _ 
    Public Property ListItems() As DataSet 
     Get 
      Return _ListItems 
     End Get 
     Set(ByVal value As DataSet) 
      _ListItems = value 
     End Set 
    End Property 

    Private _ProductsList As DataTable 
    Public Property ProductsList As DataTable 
     Get 
      Return _ProductsList 
     End Get 
     Set(value As DataTable) 
      _ProductsList = value 
     End Set 
    End Property 

    Private _imageID As Int32 = 0 
    Public Property imageID() As Int32 
     Get 
      Return _imageID 
     End Get 
     Set(ByVal value As Int32) 
      _imageID = value 
     End Set 
    End Property 

    Private _Title As String = String.Empty 
    Public Property Title() As String 
     Get 
      Return _Title 
     End Get 
     Set(ByVal value As String) 
      _Title = value 
     End Set 
    End Property 
    End Class 

動作控制器

<Authorize()> _ 
    <AcceptVerbs(HttpVerbs.Post)> _ 
    <ValidateInput(False)> _ 
    Async Function ProjectUpdate(ByVal d As ProjectDetails) As Task(Of JsonResult) 
    'send results to database here 
    Save(d) 
    return json(true) 
    End Function 

部首

POST http://localhost:51110/projectUpdate HTTP/1.1 
    Host: localhost:51110 
    Connection: keep-alive 
    Content-Length: 10119 
    Accept: application/json, text/plain, */* 
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36 
    Content-Type: application/json;charset=UTF-8 
    Accept-Encoding: gzip, deflate 
    Accept-Language: en-US,en;q=0.8 

個JSON數據發佈

{"ListItems": 

    {"ProjectStatusCodes":[{"id":1,"ProjectStatusTx":"Stage1 - Under Construction"},{"id":3,"ProjectStatusTx":"Stage3 - Project Released"},{"id":4,"ProjectStatusTx":"Project Closed"}], 

    "ProductsList":[ 
    {"id":2336,"Name":"Product1","Description":"This is a description","$$hashKey":"00K"}, 
    {"id":2337,"Name":"Product2","Description":"This is a second description","$$hashKey":"00M"}], 

    "imageID":345, 
    "Title":"books", } 
    } 

AngularJS代碼

$scope.update = function (formData) { 
    $http({ 
     method: 'POST', 
     url: '/projectbuilder/projectUpdate', 
     contentType: 'application/json; charset=utf-8', 
     data: JSON.stringify($scope.formData) 
    }).success(function (data, status, headers, config) { 
     $scope.codeStatus = status; 
    }).error(function (data, status, headers, config) { 
     $scope.codeStatus = status || "Request failed"; 

    }); 

與HTML表單模板值

<div ng-repeat="ProductsList in formData.ListItems.ProductsList"> 
     <div> 
      <div> 
      <div> 
       <input value="{{ProductsList.Title}}" name="ProductsList.Title" ID="ProductsList.Title" ng-model="ProductsList.Title" > 
       <br /> 
       <input value="{{ProductsList.ImageID}}" name="ProductsList.ImageID" ID="ProductsList.ImageID" ng-model="ProductsList.ImageID" > 
      </div> 
     </div> 
    </div> 

行爲 的JSON崗位工作網絡ne連接到控制器，並綁定ImageID和Title。 ListItems數據集不包含任何表，並且ListItems數據集中的ProductsList數據表不存在。

注意：JSON中的ProjectStatusCodes數據未映射回模型，因爲它僅用於表單上的顯示目的。

Answer 1

好的。我想到了。看起來好像JSON.NET在發送時序列化對象方面做得很好，確保它完全符合JSON。壞消息是，它將大部分將數據發送回.NET應用程序時可反序列化的東西都刪除了。

我最終做的是在回發中捕獲JSON字符串，並使用JSON.NET片段序列化來分別訪問序列化的數據表數據，您可以在這裏找到它。 http://www.newtonsoft.com/json/help/html/SerializingJSONFragments.htm我按照原樣離開了對象的其餘部分，並從JSON字符串中獲取數據表，並使用此技術手動進行反序列化。文章中的例子非常豐富。

代碼來讀取JSON字符串

Dim req As Stream = Request.InputStream 
    req.Seek(0, System.IO.SeekOrigin.Begin) 
    Dim jsonstring As String = New StreamReader(req).ReadToEnd() 

代碼來解析IT OUT和反序列化

Dim ProductsList As JObject = JObject.Parse(jsonstring) 
    Dim results As IList(Of JToken) = ProductsList("ListItems")("ProductsList").Children().ToList() 

    Console.Write(results) 

不是非常優雅，但它的工作原理。

Answer 2

如果它試圖從你的JSON序列化「listItems中的」成一個列表對象，則可能會導致問題，因爲你沒有括號中的JSON，即使是在列表中只有一個對象：

{"ListItems":[ 
     { 
      "ProjectStatusCodes":[{"id":1,"ProjectStatusTx":"Stage1 - Under Construction"},{"id":3,"ProjectStatusTx":"Stage3 - Project Released"},{"id":4,"ProjectStatusTx":"Project Closed"}], 
      "ProductsList":[{"id":2336,"Name":"Product1","Description":"This is a description","$$hashKey":"00K"},{"id":2337,"Name":"Product2","Description":"This is a second description","$$hashKey":"00M"}], 
      "imageID":345, 
      "Title":"books" 
     } 
    ]} 

確定。