是否可以将凭据添加到。NET中现有的HttpClient对象[重复]

Question

我的应用程序调用了一堆不同的外部API类。为了便于这样做，我为每个要调用的外部API设置了一个类，所有这些类都继承自一个基类，该基类的开头如下所示：

public abstract class ApiBase : 
{
    protected static HttpClient client = new HttpClient();
    protected EntityFrameWorkCredentialObject credential;

    public bool AccountSupported(int accountId)
    {
        using (var context = DBProvider.GetTransientEntityContext())
        {
            credential = context.EntityFrameWorkCredentialObject
                            .Where(x => x.AccountId == accountId.FirstOrDefault();
        }

        return credential != null;
    }
}

using (var handler = new HttpClientHandler { Credentials = ... })
using (var client = new HttpClient(handler))
{
    var result = await client.GetAsync(...);
}

是否没有办法在现有对象上设置凭据，或者没有进行大量重构的其他方法？

Answer 1

credentials所做的就是将所需的身份验证标头添加到httpclient请求中。

您始终可以通过设置默认请求头手动添加身份验证头：

var client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer","Token");
client.DefaultRequestHeaders.Authorization = 
    new AuthenticationHeaderValue("Basic",
    Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(
        string.Format("{0}:{1}", "yourusername", "yourpwd"))));