[英]Xamarin Android send Post data to WebApi
我有一個使用Xamarin在Visual Studio中創建的Android應用,我想將json格式的表單數據發送到用C#創建的Web Api 。 我嘗試了很多來自網絡的方法,但沒有奏效。
有時我會收到500 Internal Server Error(內部服務器錯誤),有時會得到null。
我在WebApi中嘗試的最后一個版本是:
public HttpResponseMessage Post([FromBody]string value)
{
if (value == null || value == "") Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Could not read subject/tutor from body");
var user = JsonConvert.DeserializeObject<UsersModel>(value);
dynamic json = System.Web.Helpers.Json.Decode(value);
string newName = json.Name;
string newSurname = json.Surname;
string newUsername = json.Username;
string newPassword = json.Password;
string insertNewUser = "INSERT INTO USERS(NAME,SURNAME,USERNAME,PASSWORD) VALUES (:name,:surname,:username,:password) ";
using (OracleConnection conn = new OracleConnection(ConfigurationManager.ConnectionStrings["Licenta"].ConnectionString))
{
OracleCommand cmd = new OracleCommand(insertNewUser, conn);
cmd.Parameters.Add("name", newName);
cmd.Parameters.Add("surname", newSurname);
cmd.Parameters.Add("username", newUsername);
cmd.Parameters.Add("password", newPassword);
cmd.ExecuteNonQuery();
}
return Request.CreateResponse(HttpStatusCode.OK);
}
catch(Exception ex)
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
}
}
我要發送到Web api的消息是
{
"name": "Ionescu",
"surname": "Ralu",
"username": "ralucuta",
"password": "1235555",
"usertype":1
}
這是我的Xamarin Android應用代碼:
public async Task<UserAccount> SaveProduct(UserAccount product)
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://blabla:80/test/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
StringContent content = new StringContent(JsonConvert.SerializeObject(product), Encoding.UTF8, "application/json");
// HTTP POST
HttpResponseMessage response = await client.PostAsync("api/Users/", content);
if (response.IsSuccessStatusCode)
{
string data = await response.Content.ReadAsStringAsync();
product = JsonConvert.DeserializeObject<UserAccount>(data);
}
}
return product;
}
public class UserAccount
{
public string name { get; set; }
public string surname { get; set; }
public string username { get; set; }
public string password { get; set; }
public int usertype { get; set; }
}
由於您正在傳遞UserAccount
對象並且期望使用string
因此不會調用您的rest api。 像這樣更改您的Web API簽名
[HttpPost]
[Route("api/Users/save")]
public HttpResponseMessage MyMethod(UserAccount userAccount)
{
//your api code
}
並在您的android代碼中
public async Task<UserAccount> SaveProduct(UserAccount product)
{
try {
using (var client = new HttpClient ()) {
client.BaseAddress = new Uri ("http://blabla:80/test/");
client.DefaultRequestHeaders.Accept.Clear ();
client.DefaultRequestHeaders.Accept.Add (new MediaTypeWithQualityHeaderValue ("application/json"));
var uri = new Uri ("http://blabla:80/test/api/Users/save");
string serializedObject = JsonConvert.SerializeObject (product);
HttpContent contentPost = new StringContent (serializedObject, Encoding.UTF8, "application/json");
HttpResponseMessage response = await client.PostAsync (uri, contentPost);
if (response.IsSuccessStatusCode) {
var data = await response.Content.ReadAsStringAsync ();
UserAccount product = JsonConvert.DeserializeObject<UserAccount>(data);
return product;
}
}
}
catch (Exception) {
return null;
}
}
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