C# 远程服务器返回错误：（400）

我试图将json数据发布到API中，但不断收到错误

System.Net.WebException:远程服务器返回错误：（400） 错误的请求

方法如下

public string TestSubmitRequest()
{
    try
    {
        string result = string.Empty;

        //var httpWebRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("https://mytest/v1/Request");
        var httpWebRequest = System.Net.WebRequest.CreateHttp("https://mytest.com/v1/Request");
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = new JavaScriptSerializer().Serialize("{\"Name\":\"chamara\",\"Email\":\"a@e.com\",\"Phone\":\"5345345\"," +
                "\"RequireTeleHealth\":false,\"PreferredTime\":0,\"PreferredContactType\":1,\"FindOtherPsychologists\":false,\"Postcode\"" +
                ":\"3153\",\"Location\":{\"Suburb\":\"Bayswater\",\"Postcode\":\"3153\"},\"Issues\":[{\"Description\":\"Depression\"}]," +
                "\"FundedPrograms\":[],\"ShortListedPsychologists\":[{\"Id\":\"047846\"},{\"Id\":\"156683\"},{\"Id\":\"158291\"},{\"Id\":\"019526\"},{\"Id\":\"031396\"}]}");
            streamWriter.Write(json);
            streamWriter.Flush();
        }

        var httpResponse = (System.Net.HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            result = streamReader.ReadToEnd();
        }

        return result;

    }catch(Exception ex)
    {
        throw ex;
    }
}

但是，相同的请求可以工作，并在Postman上返回预期结果

---

C代码怎么了？

使用这个，它会工作的。它已经是一个json，因此无需进一步序列化它

string json = "{\"Name\":\"chamara\",\"Email\":\"a@e.com\",\"Phone\":\"5345345\"," +
                "\"RequireTeleHealth\":false,\"PreferredTime\":0,\"PreferredContactType\":1,\"FindOtherPsychologists\":false,\"Postcode\"" +
                ":\"3153\",\"Location\":{\"Suburb\":\"Bayswater\",\"Postcode\":\"3153\"},\"Issues\":[{\"Description\":\"Depression\"}]," +
                "\"FundedPrograms\":[],\"ShortListedPsychologists\":[{\"Id\":\"047846\"},{\"Id\":\"156683\"},{\"Id\":\"158291\"},{\"Id\":\"019526\"},{\"Id\":\"031396\"}]}";

---

用这个，它会工作的。它已经是一个json，因此无需进一步序列化它

string json = "{\"Name\":\"chamara\",\"Email\":\"a@e.com\",\"Phone\":\"5345345\"," +
                "\"RequireTeleHealth\":false,\"PreferredTime\":0,\"PreferredContactType\":1,\"FindOtherPsychologists\":false,\"Postcode\"" +
                ":\"3153\",\"Location\":{\"Suburb\":\"Bayswater\",\"Postcode\":\"3153\"},\"Issues\":[{\"Description\":\"Depression\"}]," +
                "\"FundedPrograms\":[],\"ShortListedPsychologists\":[{\"Id\":\"047846\"},{\"Id\":\"156683\"},{\"Id\":\"158291\"},{\"Id\":\"019526\"},{\"Id\":\"031396\"}]}";

---

“mytest”和“mytest.com”是一个问题吗？另外，除非有充分的理由保留它，否则这是相当古老的C#代码。现在你最好使用

HttpClient

，数据的DTO，以及像NewtonSoft这样的JSON序列化器来创建有效负载。“mytest”和“mytest.com”是一个问题吗？另外，除非有充分的理由保留它，否则这是相当古老的C代码。现在最好使用

HttpClient

、数据的DTO和像NewtonSoft这样的JSON序列化程序来创建有效负载。