asp.net-mvc 从 MVC POST 操作方法调用 Web API 并接收结果
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Call to Web API from MVC POST action method and receive a result
提问by Paolo B
I am trying to call to a Web API from MVC POST action method and receive a result but not sure how, for example:
我正在尝试从 MVC POST 操作方法调用 Web API 并接收结果但不确定如何，例如：
[HttpPost]
public ActionResult Submit(Model m)
{
// Get the posted form values and add to list using model binding
IList<string> MyList = new List<string> { m.Value1,
m.Value2, m.Value3, m.Value4};
return Redirect???? // Redirct to web APi POST
// Assume this would be a GET?
return Redirect("http://localhost:41174/api/values")
}
I wish to send the above MyList to the Web Api to be processed, then it will send a result (int) back to the original controller:
我希望将上面的MyList发送到Web Api进行处理，然后它将结果（int）发送回原始控制器：
// POST api/values
public int Post([FromBody]List<string> value)
{
// Process MyList
// Return int back to original MVC conroller
}
Have no idea how to proceed, any help appreciated.
不知道如何进行，任何帮助表示赞赏。
回答by CodeCaster
You shouldn't redirect with POST, a redirect almost always uses GET, but you don't want to redirect to an API anyway: what is the browser going to do with the response?
您不应该使用 POST 重定向，重定向几乎总是使用 GET，但无论如何您都不想重定向到 API：浏览器将如何处理响应？
You'll have to perform the POST from your MVC controller and return the data.
您必须从 MVC 控制器执行POST 并返回数据。
Something like this:
像这样的东西：
[HttpPost]
public ActionResult Submit(Model m)
{
// Get the posted form values and add to list using model binding
IList<string> postData = new List<string> { m.Value1, m.Value2, m.Value3, m.Value4 };
using (var client = new HttpClient())
{
// Assuming the API is in the same web application.
string baseUrl = HttpContext.Current
.Request
.Url
.GetComponents(UriComponents.SchemeAndServer, UriFormat.SafeUnescaped);
client.BaseAddress = new Uri(baseUrl);
int result = client.PostAsync("/api/values",
postData,
new JsonMediaTypeFormatter())
.Result
.Content
.ReadAsAsync<int>()
.Result;
// add to viewmodel
var model = new ViewModel
{
intValue = result
};
return View(model);
}
}
回答by mason
Your Web API controller shouldn't be doing much itself. In an application that has proper Separation of Concerns, your processing should be done elsewhere. For example:
您的 Web API 控制器本身不应该做太多事情。在具有适当关注点分离的应用程序中，您的处理应该在其他地方完成。例如：
This might be in your domain model.
这可能在您的域模型中。
public class StringUtilities
{
//Just a representative method of one way of processing the strings
public int CountSomeStrings(IEnumerable<string> strings)
{
return strings.Count();
}
}
Part of your Web API
Web API 的一部分
// POST api/values
public int Post([FromBody]List<string> value)
{
return StringUtilities.CountSomeStrings(value);
}
Then calling in your MVC controller, no need to call the Web API. Just call the method it calls directly.
然后调用您的 MVC 控制器，无需调用 Web API。直接调用它调用的方法即可。
[HttpPost]
public ActionResult Submit(Model m)
{
// Get the posted form values and add to list using model binding
IList<string> MyList = new List<string> { m.Value1,
m.Value2, m.Value3, m.Value4};
int NumStrings = StringUtilities.CountSomeStrings(MyList);
ViewBag["NumStrings"] = NumStrings;
return View();
}
回答by Silpa
Using this in Controller
在控制器中使用它
public async Task<ActionResult> EmployeeRegister(CreateEmployee model)
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri("http://localhost:8082/");
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Accept.Clear();
HttpResponseMessage response = await client.PostAsJsonAsync("api/CreateEmployee/PostEmployee", model);
if (response.IsSuccessStatusCode == true)
{
return View();
}
return View();
}
