VB .Net：Json 未使用 ASHX 返回

Question

我的代码没有返回 Json 响应时遇到问题。我以前从未使用 ASHX 构建过 API。我检查了正在创建的 Json 字符串，它看起来不错。

返回的序列化 json 如下所示：

"{""Error"":""Error: Import: Unknown SKU Received!""}"

这是应该返回的正确消息。相反，我收到 Bad Request 作为响应。不会在我的代码端产生任何错误。

代码片段：

Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
    Dim oImporter As Importer
    Dim oResponse As Domain.Structures.Structures.ReturnResponse
    Dim Input_sr As StreamReader
    Dim sData As String
    Dim bolError As Boolean = False
    Dim obj As New Domain.Models.Order.Order
    Dim sError As New order_response_error
    Dim sResponse As New order_response_success

    Try
        Input_sr = New StreamReader(context.Request.InputStream)
        sData = Input_sr.ReadToEnd
        Input_sr.Close()

        If context.Request.ContentType.StartsWith("application/json") Then
            obj = JsonConvert.DeserializeObject(Of Domain.Models.Order.Order)(sData)
            If obj.api_key = ConfigurationManager.AppSettings("api_key") Then
                oImporter = New Importer(sData)
                oResponse = oImporter.ImportOrder
                context.Response.StatusCode = HttpStatusCode.OK

                If oResponse.ReturnCode = "Error" Then
                    bolError = True
                    context.Response.StatusCode = HttpStatusCode.BadRequest
                    sError.Error = oResponse.ReturnCode + ": " + oResponse.Message
                    'sError.Error = String.Format(oResponse.ReturnCode, oResponse.Message)
                Else
                    context.Response.StatusCode = HttpStatusCode.OK
                    sResponse.vendor_order_id = oResponse.Message
                End If
            Else
                bolError = True
                context.Response.StatusCode = HttpStatusCode.Unauthorized
                sError.Error = "Error: Access Denied"
                'sError.Error = String.Format("Error", "Access Denied")
            End If
        Else
            bolError = True
            context.Response.StatusCode = HttpStatusCode.BadRequest
            sError.Error = "Error: Invalid content type"
            'sError.Error = String.Format("Error", "Invalid content type")
        End If
    Catch ex As Exception
        bolError = True
        context.Response.StatusCode = HttpStatusCode.BadRequest
        Utils.ErrorEmail("Order Error!", ex, AttachmentName:="Order.xml", AttachmentData:=sData)
        sError.Error = String.Format("Error", ex.Message)
    End Try

    context.Response.ContentType = "application/json"

    If bolError Then
        context.Response.Write(JsonConvert.SerializeObject(sError))
    Else
        context.Response.Write(JsonConvert.SerializeObject(sResponse))
    End If
End Sub

来自客户端的错误响应：

错误： Cache-Control:
私人的 Content-Type: application/json;字符集=utf-8 服务器：Microsoft-IIS/10.0 X-AspNet-Version：4.0.30319 X-SourceFiles: =?UTF-8?B?XFxhd2FyZGdyYXBoaWNzLmNvbVxkYXRhXFVzZXJzXG1ob2xtZXNcRGVza3RvcFxDb2xsYWdlXENvbGxhZ2VcQ29sbGFnZS5XZWIuUG9ydGFsXGFwaVx0ZkXN0xL? X-Powered-By: ASP.NET Access-Control-Allow-Origin: * Access-Control-Allow-Methods:
获取，POST，选项 Access-Control-Allow-Headers: X-Requested-With,Content-Type 日期：
2019 年 10 月 14 日星期一 14:47:57 GMT Content-Length: 48 字节完成请求 HEADERS 漂亮的 Sec-Fetch-Mode: 科尔斯来源：chrome-extension://aejoelaoggembcahagimdiliamlcdmfm User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36 Content-Type: application/json 接受：/ Sec-Fetch-Site: cross-site Accept-Encoding: gzip, deflate, br Accept-Language: en-US,en;q=0.9 Cookie：AspxAutoDetectCookieSupport=1

Answer 1

您的代码中只有一个地方您 return 来自服务器的自定义消息，并带有 'BadRequest'，在这些行中：

context.Response.StatusCode = HttpStatusCode.BadRequest
sError.Error = oResponse.ReturnCode + ": " + oResponse.Message

这意味着您的业务逻辑正在 returning 这个（我不能说是否恰当）。您需要跟踪业务逻辑以找到呈现错误 SKU 消息的逻辑。从这个角度来看，ASHX 看起来工作正常。

VB .Net：Json 未使用 ASHX 返回

VB .Net: Json not returning using ASHX

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