webclient

问题 I am using a web client class in my source code for downloading a string using http. This was working fine. However, the clients in the company are all connected now to a proxy server. And the problem started from this. When I have tested my application I don't think it can pass through the proxy server, as the exception that keeps getting thrown is "no response from xxx.xxx.xxx.xxx which is the proxy server IP address. However, I can still navigate to the web site URL and it displays the

问题 I know it is pretty simple to add a certificate to a HttpWebRequest. However, I have not found a way to do the equivalent using WebClient. Basicly, I want to send out a POST with a specific certificate using WebClient. How would you accomplish this exact code using WebClient: var request = (HttpWebRequest) WebRequest.Create("my-url"); request.Method = "POST"; request.ClientCertificates.Add(new X509Certificate()); //add cert 回答1: You must subclass and override one or more functions. class

问题 What difference is there between the WebClient and the HttpWebRequest classes in .NET? They both do very similar things. In fact, why weren't they merged into one class (too many methods/variables etc may be one reason but there are other classes in .NET which breaks that rule). Thanks. 回答1: WebClient is a higher-level abstraction built on top of HttpWebRequest to simplify the most common tasks. For instance, if you want to get the content out of an HttpWebResponse, you have to read from the

问题 When I try to POST to a URL it results in the following exception: The remote server returned an error: (417) Expectation Failed. Here's a sample code: var client = new WebClient(); var postData = new NameValueCollection(); postData.Add("postParamName", "postParamValue"); byte[] responseBytes = client.UploadValues("http://...", postData); string response = Encoding.UTF8.GetString(responseBytes); // (417) Expectation Failed. Using an HttpWebRequest/HttpWebResponse pair or an HttpClient doesn't

问题 I am trying to access a webpage on a same domain / same asp.net application, that is password protected. Credentials are the same both for webpage firing this call and webpage being accessed. Here is the code, and I don't know why I always end up with a login form html code? using (WebClient client = new WebClient()) { client.QueryString.Add("ID", "1040"); //add parameters //client.Credentials = CredentialCache.DefaultCredentials; //I tried to add credentials like this client.Credentials =

问题 I am trying to access a webpage on a same domain / same asp.net application, that is password protected. Credentials are the same both for webpage firing this call and webpage being accessed. Here is the code, and I don't know why I always end up with a login form html code? using (WebClient client = new WebClient()) { client.QueryString.Add("ID", "1040"); //add parameters //client.Credentials = CredentialCache.DefaultCredentials; //I tried to add credentials like this client.Credentials =

问题 Good day. I'm using the WebClient class in my C# application in order to download the same file every minute, and then the application performs a simple check to see if the file has been changed, and if it does do something with it. Well since this file is downloaded every minute the WebClient caching system is caching the file, and not downloading the file again, just simply getting it from the cache, and that gets in the way of checking if the file downloaded is new. So i would like to know

问题 I'm relatively new to using C#, and have an application that reads parts of the source code on a website. That all works; but the problem is that the page in question requires the user to be logged in to access this source code. What my program needs a way to initially log the user into the website- after that is done, I'll be able to access and read the source code. The website that needs to be logged into is: mmoinn.com/index.do?PageModule=UsersLogin I've searched for the entire day about

问题 It is now 8 hours and I am still trying to figure out. Code examples will be in VB.NET but I think they are also readable for C# users. Oh, and I accept C# solutions too. This takes maximum 50ms: Dim Data as String = wc.DownloadString("x.com") While this takes 600ms average: Dim client As New Net.Sockets.TcpClient client.NoDelay = True client.Client.NoDelay = True client.Connect(IP, 80) Dim ns As Net.Sockets.NetworkStream = client.GetStream Dim gbytes(70000) As Byte ns.Write(rbytes, 0, rbytes

问题 I want to download webpages html code, but have problems with several links. For example: http://www.business-top.info/, http://azerizv.az/ I recieve no html at all using this: 1. WebClient: using (var client = new WebClient()) { client.Encoding = System.Text.Encoding.UTF8; string result = client.DownloadString(resultUrl); Console.WriteLine(result); Console.ReadLine(); } 2. Http request/response var request = (HttpWebRequest)WebRequest.Create(resultUrl); request.Method = "POST"; using (var