[英]Calling MVC4 WebAPI methods from C# Metro UI Client using PostAsync, HttpClient & Json
I've created a method using the new WebAPI features in MVC4 and have it running on Azure. 我已经使用MVC4中的新WebAPI功能创建了一个方法,并让它在Azure上运行。 The method requires that you post a simple LoginModel object that consists of a Username and Password property.
该方法要求您发布一个包含Username和Password属性的简单LoginModel对象。 Yes, I plan on securing this further once I get past this speed bump :-) The method then responds with an object in Json format:
是的,一旦我超过这个减速带,我计划进一步确保这个:-)然后该方法以Json格式响应一个对象:
I can successfully call this method using Fiddler, provided that I include "Content-Type: application/json" in the Request Headers. 我可以使用Fiddler成功调用此方法,前提是我在请求标头中包含“Content-Type:application / json”。 It returns with 200 and I can go into the Fiddler Inspector and view the Json response object just fine:
它返回200,我可以进入Fiddler检查器并查看Json响应对象就好了:
I am however having problems calling this same method from a MetroUI app in Windows8 using C#/XAML. 然而,我在使用C#/ XAML从Windows8中的MetroUI应用程序调用此相同方法时遇到问题。 I began playing around with the HttpClient and the new Async concepts in C# and no matter how I formatted my Post calls (even when explicitly calling out that I want the Content-Type to be "application/json") Fiddler returns with a 500 error and states that the attempt was using Content-Type:"text/html".
我开始在C#中使用HttpClient和新的Async概念,无论我如何格式化我的Post调用(即使明确地调用我希望Content-Type为“application / json”)Fiddler返回500错误并声明该尝试使用的是Content-Type:“text / html”。 I beleive this to be the root of the problem:
我相信这是问题的根源:
I have tried everything conceivable in order to post to this method and get back the Json object, here is my most recent attempt: 为了发布这个方法并获取Json对象,我已经尝试了一切可能的想法,这是我最近的尝试:
HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
HttpContent content = new StringContent(@"{ ""Username"": """ + Username.Text + @", ""Password"": """ + Password.Text + @"""}");
client.PostAsync("http://myapi.com/authentication", content).ContinueWith(result =>
{
var response = result.Result;
response.EnsureSuccessStatusCode();
});
This results in a 500 error with Content-Type set to "text/html" 这导致500错误,Content-Type设置为“text / html”
Here was another attempt which also failed: 这是另一次失败的尝试:
HttpClient httpClient = new HttpClient();
HttpResponseMessage response = await httpClient.PostAsync("http://myapi.com/authentication", new StringContent(@"{ ""Username"": """ + Username.Text + @", ""Password"": """ + Password.Text + @"""}", Encoding.UTF8, "application/json"));
string statusCode = response.StatusCode.ToString();
Can anyone point me in the right direction? 谁能指出我正确的方向?
Just tried the following code thanks to the advice of Nemesv: 根据Nemesv的建议,尝试了以下代码:
HttpClient httpClient = new HttpClient();
HttpContent content = new StringContent(@"{ ""Username"": """ + Username.Text + @", ""Password"": """ + Password.Text + @"""}");
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
HttpResponseMessage response = await httpClient.PostAsync("http://webapi.com/authentication", content);
string statusCode = response.StatusCode.ToString();
response.EnsureSuccessStatusCode();
It now shows "application/json" in my request header, but still shows "text/html" in the Web Session: 它现在在我的请求标题中显示“application / json”,但仍然在Web Session中显示“text / html”:
Try this to set the Headers.ContentType
: 试试这个来设置
Headers.ContentType
:
HttpClient httpClient = new HttpClient();
HttpContent content = new StringContent(@"{ ""Username"": """ + "etc." + @"""}");
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
HttpResponseMessage response =
await httpClient.PostAsync("http://myapi.com/authentication", content);
string statusCode = response.StatusCode.ToString();
There is some missing try this is working. 有一些遗漏尝试这是有效的。
UserLoginModel user = new UserLoginModel { Login = "username", Password = "password" };
string json = Newtonsoft.Json.JsonConvert.SerializeObject(user);
HttpContent content = new StringContent(json);
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
HttpClient client = new HttpClient();
client.BaseAddress = new Uri("http://localhost:1066/api/");
HttpResponseMessage response = client.PostAsync("Authenticate", content).Result;
if (response.IsSuccessStatusCode)
{
var result = response.Content.ReadAsAsync<ResultModel>().Result;
}
else
{
return string.Empty;
}
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