将值从 Angular 服务应用程序发送到 C# 后端控制器

Question

我对此感到非常疯狂，我几乎尝试了所有方法，但找不到将字符串值从服务传递到后端以根据该字符串返回 Json 结果的方法。

这就是问题所在，我有一个使用元信息来处理所有 JSON 的后端 前端提供，然后将它们返回到前端进行显示，在这种情况下，我必须获取一个基于过滤器的 JSON，该过滤器由插入前端的字符串制成，但找不到将字符串传递给后端的方法，我不想通过 URL 传递它。

这是我的代码：

angular typescript 服务：我想通过"whr"

getAdvancedFilterResult(concept: string, whr: string): Promise<any> {

  const headers: Headers = new Headers({
    'Content-Type': 'application/json'
  });
  this.authService.getAuthorizationHeader(headers);
  headers.append('IdLng', this.config.idLanguage);

  const options: RequestOptions = new RequestOptions();
  options.headers = headers;

  return this.http.get(this.config.apiDomain + this.config.apiEndpointEntities + '/' + concept + '/' + "filtered",
      options
    )
    .toPromise()
    .then(
      response => response.json() as any[]
    )
    .catch((error) => this.customHandleError(error, this.toastrService));
}

后端控制器：

[Route("api/Entities/{entity}/filtered/")]
public HttpResponseMessage GetFilter(string entity) {

  HttpResponseMessage response = new HttpResponseMessage();
  string action = "READ";

  //Check Authorization
  AuthorizationResponse authResponse = AuthProvider.CheckAuthorization(new AuthorizationRequest() {
    SCode = UserUtils.GetUserSCode(User),
      ConceptString = entity,
      ActionString = action,
      UserId = UserUtils.GetUserID(User),
      ExtraParameters = new AuthorizationRequest.ExtraParamaters() {
        IdsOnly = false, Where = "!!!!!WHR HERE!!!!"
      }
  });
  if (authResponse.IsAuthorized) {
    //code
    response = Request.CreateResponse(HttpStatusCode.OK, json);
  } else {
    response = Request.CreateResponse(HttpStatusCode.Unauthorized);
  }
  return response;
}

我应该通过header 和headers.append('whr', whr); 将它传递到http.get 上的options 还是通过options.body = whr; 进入body？

另外，我怎样才能让它在后端使用？

Answer 1

您应该像这样传递标头：

getAdvancedFilterResult(concept: string, whr: string): Promise<any> { 
  this.authService.getAuthorizationHeader(headers);
  let headers: HttpHeaders = new HttpHeaders();
  headers = headers.append('Content-Type', 'application/json');
  headers = headers.append('x-corralation-id', '12345');
  headers = headers.append('IdLng', this.config.idLanguage);
  headers = headers.append('whr', whr);

  const options: RequestOptions = new RequestOptions();
  options.headers = headers;

  return this.http.get(this.config.apiDomain + this.config.apiEndpointEntities + '/' + concept + '/' + "filtered",
      options
    )
    .toPromise()
    .then(
      response => response.json() as any[]
    )
    .catch((error) => this.customHandleError(error, this.toastrService));
}

要获取服务器端的标头，请尝试以下操作：

[Route("api/Entities/{entity}/filtered/")]
public HttpResponseMessage GetFilter(string entity) {

  var request = Request;
  var headers = response.Headers;
  HttpResponseMessage response = new HttpResponseMessage();
  string action = "READ";
  var whrHeader = headers.Contains("whr") ? request.Headers.GetValues("whr").First() : ""

  AuthorizationResponse authResponse = AuthProvider.CheckAuthorization(new AuthorizationRequest() {
    SCode = UserUtils.GetUserSCode(User),
      ConceptString = entity,
      ActionString = action,
      UserId = UserUtils.GetUserID(User),
      ExtraParameters = new AuthorizationRequest.ExtraParamaters() {
        IdsOnly = false,
        Where = whrHeader
      }
  });
  if (authResponse.IsAuthorized) {
    //code
    response = Request.CreateResponse(HttpStatusCode.OK, json);
  } else {
    response = Request.CreateResponse(HttpStatusCode.Unauthorized);
  }
  return response;
}

Answer 2

感谢 SiddAjmera，我得到了解决方案！

在前端服务：

getAdvancedFilterResult(concept: string, whr: string): Promise<any> {
  let headers: Headers = new Headers();
  this.authService.getAuthorizationHeader(headers);
  headers.append('Content-Type', 'application/json');
  headers.append('IdLng', this.config.idLanguage);
  headers.append('whr', whr);

  const options: RequestOptions = new RequestOptions();
  options.headers = headers;
  return this.http.get(
      this.config.apiDomain + this.config.apiEndpointEntities + '/' + concept + '/' + "filtered",
      options
    )
    .toPromise()
    .then(
      response => response.json() as any[]
    )
    .catch((error) => this.customHandleError(error, this.toastrService));
}

然后在后端，只需使用已经创建的 UserUtils 来获取具有值 'whr' 的标头并将其传递给函数。

UserUtilis.cs：

public static string Where(HttpRequestMessage re) {
  string whereCLause = "";

  var headers = re.Headers;
  if (headers.Contains("whr")) {
    whereCLause = headers.GetValues("whr").First();
  } else {
    whereCLause = " ";
  }
  return whereCLause;
}

还有Controller.cs

...
var re = Request;

HttpResponseMessage response = new HttpResponseMessage();
string action = "READ";

//Check Authorization
AuthorizationResponse authResponse = AuthProvider.CheckAuthorization(new AuthorizationRequest() {
  SCode = UserUtils.GetUserSCode(User),
    ConceptString = entity,
    ActionString = action,
    UserId = UserUtils.GetUserID(User),
    ExtraParameters = new AuthorizationRequest.ExtraParamaters() {
      IdsOnly = false, Where = UserUtils.Where(re)
    }
});
...