Asp.net 从代码隐藏文件调用时未经授权访问web api

我正在使用GuestController控制器类。我将从ajax和代码隐藏文件中访问这个getGuestBookingIDByRomidAPI方法。此方法在ajax调用时返回正确的结果，但在代码隐藏中出现“StatusCode:401，ReasonPhrase:‘Unauthorized’”错误

Api控制器：

[Authorize]
public class GuestController : ApiController
{

    public int GetGuestBookingIdByRoomId(int roomId)
    {
        return GuestManager.GetGuestBookingIdByRoomId(roomId);
    } // GetGuestBookingIdByRoomId
}

Ajax调用：

function getGuestBookingIdByRoomId(roomId) {
    $.ajax({
        url: _pageURL + "/api/Guest/GetGuestBookingIdByRoomId",
        type: "GET",
        data: { roomId: roomId },
        dataType: "json",
        success: function (bookingId) {
            if (bookingId != undefined && bookingId != null && bookingId > 0) {  
                _receiverBookingId = bookingId;
            } else {
                // Do Nothing                             
            }
        },
    });
} 

来自代码隐藏的api调用：

private int GetReceiverBookingId(int roomId)
{
    int receiverBookingId = 0;
    // Create object of http client 
    HttpClient client = new HttpClient();
    // assign Base address
    client.BaseAddress = new Uri("http://" + Request.Url.Authority);
    // Set request header
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    // build web api url
    var url = "/api/Guest/GetGuestBookingIdByRoomId?roomId=" + roomId;
    // Call web api method
    HttpResponseMessage response = client.GetAsync(url).Result;
    if (response.IsSuccessStatusCode) // If web api call is successfull  
    {
        receiverBookingId = response.Content.ReadAsAsync<int>().Result;
    }
    else
    {

    }       
     return receiverBookingId;
} 

private int GetReceiveBookingId（int roomId）
{
int receiverBookingId=0；
//http客户端的创建对象
HttpClient=新的HttpClient（）；
//分配基址
client.BaseAddress=新Uri（“http://”+Request.Url.Authority）；
//设置请求头
client.DefaultRequestHeaders.Accept.Add（新的MediaTypeWithQualityHeaderValue（“应用程序/json”）；
//构建web api url
var url=“/api/Guest/getguestbookingdyromid？roomId=“+roomId；
//调用web api方法
HttpResponseMessageResponse=client.GetAsync（url）.Result；
if（response.issucessStatusCode）//如果web api调用成功
{
receiverBookingId=response.Content.ReadAsAsync（）.Result；
}
其他的
{
}       
返回接收方BookingId；
} 

您正在使用的身份验证类型是什么？我正在使用“表单”身份验证尝试更改您的

HttpClientHandler

如下

HttpClientHandler hndlr=new HttpClientHandler（）；hndlr.UseDefaultCredentials=true；HttpClient=新的HttpClient（hndlr）为什么从代码背后调用API？要做到这一点，您需要从客户端捕获身份验证cookie并将其传递给API，当然前提是您在WebForms和Web API之间共享身份验证。谢谢gabriel。您能否用示例代码详细说明如何将身份验证cookie传递给web api方法？