如何使用c#发布JSON到服务器?

下面是我使用的代码:

// create a request
HttpWebRequest request = (HttpWebRequest)
WebRequest.Create(url); request.KeepAlive = false;
request.ProtocolVersion = HttpVersion.Version10;
request.Method = "POST";


// turn our request string into a byte stream
byte[] postBytes = Encoding.UTF8.GetBytes(json);

// this is important - make sure you specify type this way
request.ContentType = "application/json; charset=UTF-8";
request.Accept = "application/json";
request.ContentLength = postBytes.Length;
request.CookieContainer = Cookies;
request.UserAgent = currentUserAgent;
Stream requestStream = request.GetRequestStream();

// now send it
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();

// grab te response and print it out to the console along with the status code
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
string result;
using (StreamReader rdr = new StreamReader(response.GetResponseStream()))
{
    result = rdr.ReadToEnd();
}

return result;

当我运行这个时，我总是得到500个内部服务器错误。

我做错了什么?

当前回答

我发现这是最友好和最简洁的方式来发布读取JSON数据:

var url = @"http://www.myapi.com/";
var request = new Request { Greeting = "Hello world!" };
var json = JsonSerializer.Serialize<Request>(request);
using (WebClient client = new WebClient())
{
    var jsonResponse = client.UploadString(url, json);
    var response = JsonSerializer.Deserialize<Response>(jsonResponse);
}

我正在使用微软的System.Text.Json来序列化和反序列化JSON。NuGet见。

2020-07-31 10:33:46

其他回答

我就是这么做的

//URL
var url = "http://www.myapi.com/";

//Request
using var request = new HttpRequestMessage(HttpMethod.Post, url);

//Headers
request.Headers.Add("Accept", "application/json");
request.Headers.Add("Cache-Control", "no-cache");

//Payload
var payload = JsonConvert.SerializeObject(
    new
    {
        Text = "Hello world"
    });
request.Content = new StringContent(payload, Encoding.UTF8, "application/json");

//Send
var response = await _httpClient.SendAsync(request);

//Handle response
if (response.IsSuccessStatusCode)
    return;

2021-11-15 16:38:48

注意你正在使用的内容类型:

application/json

来源:

RFC4627

其他职位

2014-03-27 03:07:13

在。net 4.5.1之前，这个选项可以工作:

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("http://localhost:9000/");
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    var foo = new User
    {
        user = "Foo",
        password = "Baz"
    }

    await client.PostAsJsonAsync("users/add", foo);
}

2016-09-26 11:29:26

我最终通过包含.Result在同步模式下调用

HttpResponseMessage response = null;
try
{
    using (var client = new HttpClient())
    {
       response = client.PostAsync(
        "http://localhost:8000/....",
         new StringContent(myJson,Encoding.UTF8,"application/json")).Result;
    if (response.IsSuccessStatusCode)
        {
            MessageBox.Show("OK");              
        }
        else
        {
            MessageBox.Show("NOK");
        }
    }
}
catch (Exception ex)
{
    MessageBox.Show("ERROR");
}

2018-02-27 10:34:45

我最近想出了一个更简单的方法来发布JSON，额外的步骤是从我的应用程序中的模型转换。注意，你必须为你的控制器创建模型[JsonObject]来获取值并进行转换。

要求:

 var model = new MyModel(); 

 using (var client = new HttpClient())
 {
     var uri = new Uri("XXXXXXXXX"); 
     var json = new JavaScriptSerializer().Serialize(model);
     var stringContent = new StringContent(json, Encoding.UTF8, "application/json");
     var response = await client.PutAsync(uri,stringContent).Result;
     // ...
  }

模型:

[JsonObject]
[Serializable]
public class MyModel
{
    public Decimal Value { get; set; }
    public string Project { get; set; }
    public string FilePath { get; set; }
    public string FileName { get; set; }
}

服务器端:

[HttpPut]     
public async Task<HttpResponseMessage> PutApi([FromBody]MyModel model)
{
    // ...
}

2017-01-20 06:46:13

如何使用c#发布JSON到服务器?

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