[英]Sending data by JSON
我想使用mvc wepApi將JSON從桌面應用程序發送到服務器。 這是我的桌面應用程序代碼,它將數據轉換為JSON並發送。
private void btnAddUserType_Click(object sender, EventArgs e)
{
UserType userType = new UserType();
userType.UserTypeName = txtUserTypeName.Text;
string json = JsonConvert.SerializeObject(userType);
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://localhost:3852/api/default1");
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = "POST";
var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream());
streamWriter.Write(json);
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
var streamReader = new StreamReader(httpResponse.GetResponseStream());
var responseText = streamReader.ReadToEnd();
}
這是我的網絡API
// POST api/default1
public void Post([FromBody]string value)
{
UserTypeRepository bl = new UserTypeRepository();
DataContractJsonSerializer js = new DataContractJsonSerializer(typeof(UserType));
MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(value));
UserType u = new UserType();
u = (UserType)js.ReadObject(stream);
bl.Add(u);
}
但是當post api調用時, Value is null
。 為什么?
using(var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
streamWriter.Write(json);
您既不刷新也不關閉流,因此基本上數據永遠不會到達api。
我的代碼:
Program.cs-控制台應用
class Program
{
static void Main(string[] args)
{
var user = new UserModel {Id = 4, FirstName = "Michael", LastName = "Angelo"};
var json = JsonConvert.SerializeObject(user);
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://localhost:56506/api/Values/");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
using(var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
streamWriter.Write(json);
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
var streamReader = new StreamReader(httpResponse.GetResponseStream());
var responseText = streamReader.ReadToEnd();
Console.WriteLine(responseText);
Console.ReadKey();
}
}
UserModel.cs-一些數據類
public class UserModel
{
public string FirstName { get; set; }
public string LastName { get; set; }
public int Id { get; set; }
}
ValuesController.cs-模板中的WebApi控制器
public class ValuesController : ApiController
{
// GET api/values
public UserModel[] Get()
{
return UserProvider.Instance.Get(); // returns some test data
}
// GET api/values/5
public UserModel Get(int id)
{
return new UserModel{Id=1,FirstName="John",LastName="Smith"};
}
// POST api/values
public void Post([FromBody]UserModel value)
{
if (value == null) // BREAKPOINT HERE, just to see what's in value
{
var x = value;
}
}
}
WebApiConfig.cs-默認配置,添加了有關Json的內容,但是沒有它,它可以工作-這樣我就可以在瀏覽器等中輕松測試GET;)
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
// Web API configuration and services
// Web API routes
config.MapHttpAttributeRoutes();
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
}
結果:
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.