角度4中的雙後期問題

Question

Web API在IIS中運行。我正在使用CLI來運行角度項目。 Http post兩次使用Web API方法。 首次web API參數爲空。第二次使用參數。

API

[System.Web.Http.Route("api/Location/AddNewLocationSection")] 
[HttpPost] 
[AcceptVerbs("OPTIONS")] 
public GenericResult AddNewCustomerLocationSection(GenericParam<CustomerLocationSectionTreeItem> locationSectionParam) 
{ 
    //due to double post i'm doing this check 
    if (locationSectionParam != null && locationSectionParam.Parameter != null) 
    { 
     //logic 
    } 
} 

角服務

addNewLocationSection(locationSectionDetails: CustomerLocationSectionInfo): Observable<any> { 
var headers = new Headers(); 
headers.append('Content-Type', 'application/json'); 
return this.http.post(this._configuration.AddNewLocation JSON.stringify({ parameter: locationSectionDetails }), new RequestOptions({ headers: headers })) 
.map(this.extractData) 
.catch(this.handleError); 
} 

組件

this.locationDetailService.addNewLocationSection(this.locationSectionDetails) 
.subscribe(success => this.reLoadCustomerLocationTree(success, "Add"), 
error => this.errorMessage = <any>error); 

我怎樣才能避免這種雙重職務。提前致謝。

Answer 1

如果你看第一個呼叫，它是一個OPTIONS請求。這是瀏覽器發送的請求，用於檢查端點的有效性。我認爲你不能改變它！

You can find more information here