使用HttpClient GET

Question

因此，因爲HttpClient是「更好」，我需要將WebClient轉換爲HttpClient，但它不能按預期工作。以下功能使用WebClient並且像魅力一樣工作。

private static void Authenticate() 
{ 
    Console.WriteLine("Authenticating . . ."); 
    var clientId = ConfigurationManager.AppSettings["AuthNClientId"]; 
    var uri = ConfigurationManager.AppSettings["AuthNUri"]; 
    var userName = ConfigurationManager.AppSettings["AuthNUserName"]; 
    var password = ConfigurationManager.AppSettings["AuthNPassword"]; 

    var client = new WebClient(); 
    string formData = $"client_id={clientId}&grant_type=password&username={userName}&password={password}"; 
    client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded"; 
    var response = client.UploadString($"{uri}", formData); 
    dynamic authResult = JsonConvert.DeserializeObject(response); 
    _accessToken = authResult.access_token; 
    if (_accessToken == null) 
    { 
     throw new ApplicationException("Unable to authenticate. Check your configuration file <appSettings>."); 
    } 
    Console.WriteLine("Authenticated."); 
} 

此代碼另一方面返回一個BadRequest響應代碼。

static async Task<string> GetAuthenticationToken() 
{ 
    string token = string.Empty; 

    var clientId = ConfigurationManager.AppSettings["AuthNClientId"]; 
    var uri = ConfigurationManager.AppSettings["AuthNUri"]; 
    var userName = ConfigurationManager.AppSettings["AuthNUserName"]; 
    var password = ConfigurationManager.AppSettings["AuthNPassword"]; 

    client.BaseAddress = new Uri("https://myurl.com/oauth2/token"); 
    client.DefaultRequestHeaders.Accept.Clear(); 
    client.DefaultRequestHeaders.Add("ContentType", "application/x-www-form-urlencoded"); 

    var path = $"client_id={clientId}&grant_type=password&username={userName}&password={password}"; 
    HttpResponseMessage response = await client.GetAsync($"https://myurl.com/oauth2/token?{path}"); 
    if (response.IsSuccessStatusCode) 
    { 
     Console.WriteLine("success"); 
     token = await response.Content.ReadAsStringAsync(); 
    } 
    else { Console.WriteLine($"failure: {response.StatusCode}"); } 
    return token; 
} 

你可以看到，我已經試過了幾種方法，包括設置客戶端BaseAddress以及剛剛嘗試的URL傳遞到GetAsync方法。

有人看到我在這裏做錯了嗎？

Answer 1

UploadString是第一個例子中的POST方法。在第二個例子中，一個GET方法正在完成。

static async Task<string> GetAuthenticationTokenAsync() { 
    string token = string.Empty; 

    var clientId = ConfigurationManager.AppSettings["AuthNClientId"]; 
    var uri = ConfigurationManager.AppSettings["AuthNUri"]; 
    var userName = ConfigurationManager.AppSettings["AuthNUserName"]; 
    var password = ConfigurationManager.AppSettings["AuthNPassword"]; 

    var client = new HttpClient(); 
    client.BaseAddress = new Uri(uri); 
    client.DefaultRequestHeaders.Accept.Clear(); 

    var nameValueCollection = new Distionary<string, string>() { 
     { "client_id", clientId }, 
     { "grant_type", "password" }, 
     { "username", userName }, 
     { "password", password }, 
    }; 
    var content = new FormUrlEncodedContent(nameValueCollection); 
    var response = await client.PostAsync("", content); 
    if (response.IsSuccessStatusCode) { 
     Console.WriteLine("success"); 
     var json = await response.Content.ReadAsStringAsync(); 
     dynamic authResult = JsonConvert.DeserializeObject(json); 
     token = authResult.access_token; 
    } 
    else { Console.WriteLine($"failure: {response.StatusCode}"); } 
    return token; 
}