如何检索基于 json 的错误而不是标准 .net

Question

我正在访问一个 Web 服务，returns 它的错误是 json。使用 Web 客户端时如何解释这些错误？我希望能够将这些传递给我的用户，这样他们就不会遇到错误。

{ "success": false, "errors": [
{
"propertyName": "Reference",
"reason": "'Reference' must not be empty."
},
{
"propertyName": "Reference",
"reason": "'Reference' should not be empty."
}, { "propertyName": "Key",
"reason": "'Key' must be between 10 and 15 characters. You entered 3 characters."
}, { "propertyName": "Key",
"reason": "Key does not start with zero: 123." } ], "warnings": [], "information": []

这就是我呼叫第三方的方式 api 但是当我点击这条线时，我收到了一个标准的 .net 错误，我的问题是我如何才能获取上面json 后面

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

无法上传的截图

https://snag.gy/Itoy02.jpg

public void TransferToSlate(string json, string url)
{
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Method = "POST";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            streamWriter.Write(json);
        }

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

编辑 2 我尝试了以下方法，它让我更进一步，但没有对错误中的两个列表属性感到失望

public void TransferToSlate(string json, string url)
 {

  try {
         var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "POST";

            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                streamWriter.Write(json);
            }


            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
            }
        }
        catch (WebException ex){

            var resp = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();

            dynamic obj = JsonConvert.DeserializeObject(resp);
            var messageFromServer = obj.error.message;

        }

所以我创建了这个 class 但我不确定如何反序列化它的错误

 public class ErrorMessage
 {
    public string PropertyName { get; set; }

    public string Reason { get; set; }

    public override string ToString()
    {
        return string.IsNullOrWhiteSpace(PropertyName) 
            ? Reason 
            : string.Format("{0} : {1}", PropertyName, Reason);
    }
}

编辑 3

我在这里尝试了以下操作，但当我不应该用我的第一个 post.

中的 json 的错误填充时，它只是返回 null

  catch (WebException ex){

            var resp = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();
            ErrorMessage error = JsonConvert.DeserializeObject<ErrorMessage>(resp);
            var fieldinformation = error.PropertyName.ToString();
            var messageFromServer = error.Reason.ToString();

        }

Answer 1

您可以阅读来自 WebException 的回复：

try
{
    var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
    using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
    {
        var result = streamReader.ReadToEnd();
    }
}
catch(WebException ex)
{
    var httpResponse = ex.Response as HttpWebResponse;
    if (httpResponse != null)
    {
        // process the response
    }
}

如何检索基于 json 的错误而不是标准 .net

How do I retrieve json based errors instead of standard .net

c#

json

webclient