DataContract Json 项目集合中的序列化程序和缺少括号

Question

当我 de-serialize/serialize 和数据合同为 json 格式时，我的项目集合缺少括号，导致在发布到网络 api 时失败。这是带有 [] 方括号

的正确格式的 json

{
    "basket": {
        "basket_platform_type": "in_store",
        "basket_currency": {
            "currency_id": 2,
            "currency_code": "ZAR"
        },
        "basket_items": [
            {
                "spaaza_product_id": 18605,
                "retailer_product_code": "WBGT0234",
                "retailer_item_code": "line_0",
                "item_quantity": 3,
                "item_price": 250
            }
        ],
        "retailer_basket_code": "70401",
        "basket_total_price": 750
    },
    "entity": {
        "entity_type": "chain",
        "entity_id": 1740,
        "branch_business_owner_code": "501",
        "branch_business_id": 1341
    },
    "user": {
        "member_programme": "spaaza",
        "member_number": "33017307"
    }
}

这就是我得到的，我在 basketitems

缺少 []

{
    "basket": {
        "basket_platform_type": "in_store",
        "basket_currency": {
            "currency_id": 2,
            "currency_code": "ZAR"
        },
        "basket_items": 
            {
                "spaaza_product_id": 18605,
                "retailer_product_code": "WBGT0234",
                "retailer_item_code": "line_0",
                "item_quantity": 3,
                "item_price": 250
            },
        "retailer_basket_code": "70401",
        "basket_total_price": 750
    },
    "entity": {
        "entity_type": "chain",
        "entity_id": 1740,
        "branch_business_owner_code": "501",
        "branch_business_id": 1341
    },
    "user": {
        "member_programme": "spaaza",
        "member_number": "33017307"
    }
}

这是类以及我用于序列化的函数。

Namespace Global.MyPrice

Public Class GetBasketPrice

    Public Class Entity
        Public Property entity_type As String
        Public Property entity_id As Integer
        Public Property branch_business_owner_code As String
        Public Property branch_business_id As Integer
    End Class

    Public Class User
        Public Property member_programme As String
        Public Property member_number As String
    End Class

    Public Class Basket_Currency
        Public Property currency_id As Integer
        Public Property currency_code As String
    End Class

    Public Class Rootobject
        Public Property basket As Basket
        Public Property entity As Entity
        Public Property user As User
    End Class

    Public Class Basket_Items
        Public Property spaaza_product_id As Integer
        Public Property retailer_product_code As String
        Public Property retailer_item_code As String
        Public Property item_quantity As Integer
        Public Property item_price As Single
    End Class

    Public Class Basket
        Public Property basket_platform_type As String
        Public Property basket_currency As Basket_Currency
        Public Property basket_items() As Basket_Items
        Public Property retailer_basket_code As String
        Public Property basket_total_price As Single
    End Class

End Class

结束命名空间

这是序列化函数

Dim jsonstring As String
            Dim stream1 As New MemoryStream()

            Dim ser As New DataContractJsonSerializer(GetType(MyPrice.GetBasketPrice.Rootobject))
            ser.WriteObject(stream1, MyPriceBasket)

            stream1.Position = 0

            Dim sr As New StreamReader(stream1)
            Console.Write("JSON form of Person object: ")
            jsonstring = sr.ReadToEnd()

            Console.WriteLine(jsonstring)

Answer 1

"basket_items" 的值是一个 JSON 数组，它是一个带括号的值列表：[value1, value2, ..., valueN]。根据 documentation，DataContractJsonSerializer 将 "Collections, dictionaries, and arrays" 映射到 JSON 数组。因此，您的 basket_items 属性需要是某种集合，例如 List(Of Basket_Items):

Public Class Basket
    Public Property basket_platform_type As String
    Public Property basket_currency As Basket_Currency
    Public Property basket_items As List(Of Basket_Items)
    Public Property retailer_basket_code As String
    Public Property basket_total_price As Single
End Class

或者，如果您想使用数组而不是列表，则您的 () 位置错误。您在 VB.NET like this:

中定义数组值属性

    Public Property basket_items As Basket_Items()

更多 here.

DataContract Json 项目集合中的序列化程序和缺少括号

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