c# - "{\"ErrorCode\":402,\"Message\":\"Received invalid JSON input.\"}" When trying to call restsharp to make call to Postmark

Question

i'm trying to make a call to Postmarks email service RestAPI using restsharp in C# and get a "{\"ErrorCode\":402,\"Message\":\"Received invalid JSON input.\"}" error every time i send it even though i have set the data format to json, i have even tried a custom json serialize . im not sure if im setting up the Parameters properly or even it this is the best way to achieve what i'm trying so any help and suggestions would be welcome.

public void SendRest(string emailAddress, string subject, string body, params string[] recipients)
    {
        var recipientString = "";
        foreach (var recipient in recipients)
        {
            recipientString = recipientString + recipient + ',';
        }

        var client = new RestClient();
        client.BaseUrl = new Uri("https://api.postmarkapp.com/email");

        var request = new RestRequest(Method.POST);
        request.RequestFormat = DataFormat.Json;
        request.AddHeader("Content-Type", "application/json");
        request.AddHeader("Accept", "application/json");
        request.AddHeader("X-Postmark-Server-Token", "Valid-Token");

        request.AddParameter("From", "test@testington.co.uk");
        request.AddParameter("To", "robin.windon@hotmail.co.uk");
        request.AddParameter("Subject", "hi");
        request.AddParameter("TextBody", "this is a test");
        request.AddParameter("TrackOpens", true);
        request.AddParameter("TrackLinks", "None");


        IRestResponse response = client.Execute(request);
    }

Answer 1

您将参数作为（序列化）POST 参数（在正文中）或 GET 参数发送，我不确定 restsharp 是如何处理这个问题的。

但是您没有按要求在 POST 正文中发送任何 JSON。

我猜应该是这样的：

var params = JSON.Stringify(
    {
        "From": "robin.windon...",
        "To": "",
        "Subject": "",
        "TextBody": "",
        "TrackOpens": "",
        "TrackLinks": ""
    }
);
request.AddParameter("application/json", params, ParameterType.RequestBody);