Httpclienthandler Webproxy值未更改

问题描述

有人可以帮我吗。将boolean属性设置为true会有一点问题。

在这里，我为代理创建了一个类，以便可以从Winform设置并调用它到我的httpclient类。

class MyProxy
{
    public static bool UseProxy { get; set; }
    public static string ProxyHost { get; set; } = string.Empty; 
    public static string ProxyPort { get; set; } = string.Empty;
}

如果我不想使用代理，这是可选的

private static httpclienthandler handler = new httpclienthandler
{
    UseDefaultCredentials = false,PreAuthenticate = true,Proxy = new WebProxy($"http://{MyProxy.ProxyHost}:{MyProxy.ProxyPort}",false),UseProxy = MyProxy.UseProxy,// i want to change this if I want to use the proxy or not
};

所以在我的主要表单中，我有一个复选框（无论是否使用代理）

private void test()
{
  bool isCheck = cbUseProxy.Checked;
  
  //so here I'll check first if isCheck is true
  MyProxy.UseProxy = isCheck;
  
  //here I call my httpclient class
}

问题是，如果我首先设置或首先选中复选框（即useProxy），则Webproxy将获取该值。并且我取消选中（不使用代理）webproxy仍然获得第一个值（这是真的）。

我想将UseProxy（来自WebProxy）的值从true更改为false，将false更改为true。

更新后的最终解决方案：（感谢@Milney的建议。我认为这是解决方案）

private static httpclienthandler handler = new httpclienthandler
        {
            PreAuthenticate = true,UseDefaultCredentials = false,Proxy = null,UseProxy = false,};
        private static httpclienthandler handlerWithProxy = new httpclienthandler
        {
            PreAuthenticate = true,UseProxy = true,};

        private static readonly HttpClient client = new HttpClient(handler);
        private static readonly HttpClient clientWithProxy = new HttpClient(handlerWithProxy);

然后在我的ResponseMessage上

     private static async Task<JsonDocument> ResponseMessage(HttpRequestMessage request,CancellationToken token)
        {
            HttpCompletionoption option = HttpCompletionoption.ResponseHeadersRead;
            bool useProxy = MyProxy.UseProxy;

            using (var response = useProxy ? await clientWithProxy.SendAsync(request,option,token).ConfigureAwait(false) 
                                           : await client.SendAsync(request,token).ConfigureAwait(false))
            {
                token.ThrowIfCancellationRequested();

                using (var contentStream = await response.Content.ReadAsstreamAsync().ConfigureAwait(false))
                {
                    var json = await ParseJsonFromStream(contentStream);

                    if (!response.IsSuccessstatusCode)
                    {
                        if (json != null)
                        {
                            throw new InvalidDataException($"Error occured: {ParseError(uri,json)}");
                        }
                    }
                    return json;
                }
            }
        }

解决方法

在创建HttpClientHandler时，MyProxy.UseProxy具有其默认值。如果稍后更改它，它将不会自动“流动”到客户端处理程序属性。您需要重新创建HttpClientHandler，或者在实际获得要使用的值后至少重置其属性...

private void TEST()
{
  bool isCheck = cbUseProxy.Checked;
  
  // You have to set the property on the handler
  // It won't automatically refresh from your other class
  handler.UseProxy = isCheck;   

  //here I call my httpclient class
}

.net-framework-version c#c#winforms