如何编写自定义消息处理程序？ [英] How to write write a custom message handler?

问题描述

我正在尝试编写一个自定义消息处理程序，以便对我的api进行身份验证。我目前坚持以下错误 - BasicAuthHandler.SendAsync（System.Net.Http.HttpRequestMessage，System.Threading.CancellationToken）'：找不到合适的方法来覆盖 - 错误。

I am trying to write a write a custom message handler, to authencicate my api. I currently stuck on the following error -- BasicAuthHandler.SendAsync(System.Net.Http.HttpRequestMessage, System.Threading.CancellationToken)': no suitable method found to override -- error.

protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)

public class BasicAuthHandler
    {
        private const string BasicAuthResponseHeader = "WWW-Authenticate";
        private const string BasicAuthResponseHeaderValue = "Basic";

        private readonly iUser Repository = new User();

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            AuthenticationHeaderValue authValue = request.Headers.Authorization;


            if (authValue == null || authValue.Scheme != BasicAuthResponseHeaderValue)
            {
                return Unauthorized(request);
            }
            string[] credentials = Encoding.ASCII.GetString(Convert.FromBase64String(authValue.Parameter)).Split(new[] { ':' });
            if (credentials.Length != 2 || string.IsNullOrEmpty(credentials[0]) || string.IsNullOrEmpty(credentials[1]))
            {
                return Unauthorized(request);
            }
            api_login user = Repository.Validate2(credentials[0], credentials[1]);
            if (user == null)
            {
                return Unauthorized(request);
            }
            IPrincipal principal = new GenericPrincipal(new GenericIdentity(user.username, BasicAuthResponseHeaderValue), null);
            Thread.CurrentPrincipal = principal;
            HttpContext.Current.User = principal;

            return base.SendAsync(request, cancellationToken);
        }

任何有关此代码可能出错的指导。非常感谢

Any guidance into where I may be going wrong with this code. Many thanks

推荐答案

我可以帮助解决这个错误。由于' BasicAuthHandler '本身是基类，因此无法覆盖任何方法。如果在方法定义中删除 override 关键字，则将清除错误。您可能忘记为 BasicAuthHandler指定基类 ??

I can help with the error. Since 'BasicAuthHandler' itself is a base class, there can't be any method to override. If you delete 'override' keyword in the method definition, the error will be cleared. Might have you forgetten to specify a base class for BasicAuthHandler??

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