我已经广泛地研究了我的问题的解决方案，尽管我发现了似乎对其他人有用的答案，但我仍然很难确定这一点。但是我觉得我很亲近。
我正在尝试对名为Zoho Creator的在线应用程序进行Rest API调用。我正在尝试实现“添加记录”调用。他们给出的示例是使用带有提交按钮的HTML表单。但是我需要从VB .NET桌面应用程序添加记录。我已经尝试了WebClient和WebRequest，但是这些尝试都没有成功。但是我已经成功地将这些方法与其他API调用和其他API结合使用，正是这个Add Records给我带来了麻烦。
[必需参数之一是authtoken，出于安全原因，我将其替换为“ xxxxxxxxxx”。这是我创建的html表单，当我使用它时，它通过API成功创建了记录，它只是添加了一条记录，其中“ TicketID”具有单个字段值。
<!DOCTYPE html>
<html>
<body>
<form method="POST" action="https://creator.zoho.com/api/max1stdirectcom/xml/service-orders/form/Ticket_form/record/add">
<input type="hidden" name="authtoken" value="xxxxxxxxxx"/>
<input type="hidden" name="scope" id="scope" value="creatorapi"/>
<input type="text" name="TicketID" value="123"/>
<input type="submit" value="Add Record"/>
</form>
<body>
因此，上面的方法效果很好。现在，这是我的VB .NET代码尝试使用WebRequest复制相同的结果：
Protected Sub PostTo(sTicketID As String)
Dim url As String = "https://creator.zoho.com/api/max1stdirectcom/xml/service-orders/form/Ticket_form/record/add"
Dim request As WebRequest = WebRequest.Create(url)
request.Method = "POST"
' Create POST data and convert it to a byte array.
Dim postData As String = "?authtoken=" & "xxxxxxxxxx" & "?scope=creatorapi" & "?TicketID=" & sTicketID
Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
' Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded"
' Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length
' Get the request stream.
Dim dataStream As Stream = request.GetRequestStream()
' Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length)
' Close the Stream object.
dataStream.Close()
' Get the response.
Dim response As WebResponse = request.GetResponse()
' Display the status.
Debug.WriteLine(CType(response, HttpWebResponse).StatusDescription)
' Get the stream containing content returned by the server.
dataStream = response.GetResponseStream()
' Open the stream using a StreamReader for easy access.
Dim reader As New StreamReader(dataStream)
' Read the content.
Dim responseFromServer As String = reader.ReadToEnd()
' Display the content.
Debug.WriteLine(responseFromServer)
' Clean up the streams.
reader.Close()
dataStream.Close()
response.Close()
End Sub
我使用上述VB .Net代码从呼叫中获得的响应是：
<response>
<errorlist>
<error>
<code>2899</code>
<message><![CDATA[Permission Denied To Add Record(s).]]></message>
</error>
</errorlist>
</response>
因此，它显然在某种程度上与API进行了良好的通信。我使用的是正确的AuthToken，所以不确定为什么它拒绝添加记录。我正在传递与基本表单POST完全相同的“凭据”，但结果有所不同。
有什么建议让我尝试吗？
下面是VB .Net中的工作代码
请检查并在代码中添加缺少的实现。
Private Sub HTTPRestPOST (ByVal JsonInputStr As String, ByVal POSTUri As String)
'Make a request to the POST URI
Dim RestPOSTRequest As HttpWebRequest = HttpWebRequest.Create(POSTUri)
'Convert the JSON Input to Bytes through UTF8 Encoding
Dim JsonEncoding As New UTF8Encoding()
Dim JsonBytes As Byte() = JsonEncoding.GetBytes(JsonInputStr)
'Setting the request parameters
RestPOSTRequest.Method = "POST"
RestPOSTRequest.ContentType = "application/json"
RestPOSTRequest.ContentLength = JsonBytes.Length
'Add any other Headers for the URI
RestPOSTRequest.Headers.Add("username", "kalyan_nakka")
RestPOSTRequest.Headers.Add("password", "********")
RestPOSTRequest.Headers.Add("urikey", "MAIJHDAS54ADAJQA35IJHA784R98AJN")
'Create the Input Stream for the URI
Using RestPOSTRequestStream As Stream = RestPOSTRequest.GetRequestStream()
'Write the Input JSON data into the Stream
RestPOSTRequestStream.Write(JsonBytes, 0, JsonBytes.Length)
'Response from the URI
Dim RestPOSTResponse = RestPOSTRequest.GetResponse()
'Create Stream for the response
Using RestPOSTResponseStream As Stream = RestPOSTResponse .GetResponseStream()
'Create a Reader for the Response Stream
Using RestPOSTResponseStreamReader As New StreamReader(RestPOSTResponseStream)
Dim ResponseData = RestPOSTResponseStreamReader.ReadToEnd()
'Later utilize "ResponseData" variable as per your requirement
'Close the Reader
RestPOSTResponseStreamReader.Close()
End Using
RestPOSTResponseStream.Close()
End Using
RestPOSTRequestStream.Close()
End Using
End Sub