webclient

问题 I know there are tones of questions on this subject already. After reading all the threads, I decided to get a redirected URL in a confirmation HTML page and then use it as a direct link to download. As you know, the original URL format of the direct download link is like this. https://drive.google.com/uc?export=download&id=XXXXX.. But if the size of the target file is big, then it is like this. https://drive.google.com/uc?export=download&confirm=RRRR&id=XXXXX.. I can get RRRR from the first

问题 I'm downloading a web site using WebClient public void download() { client = new WebClient(); client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted); client.Encoding = Encoding.UTF8; client.DownloadStringAsync(new Uri(eUrl.Text)); } void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) { SaveFileDialog sd = new SaveFileDialog(); if (sd.ShowDialog() == DialogResult.OK) { StreamWriter writer = new StreamWriter

问题 I have a program I'm writing that downloads to files. The second file is not neccassary and is only some times included. When the second file is not included it will return an HTTP 404 error. Now, the problem is that when this error is returned it ends the whole program. What I want is to continue the program and ignore the HTTP error. So, my question is how do I catch an HTTP 404 error from a WebClient.DownloadFile request? This is the code currently used:: WebClient downloader = new

问题 I have a zip file creator that takes in a String[] of Urls, and returns a zip file with all of the files in the String[] I figured there would be a number of example of this, but I cannot seem to find an answer to "How to download many files asynchronously and return when done" How do I download {n} files at once, and return the Dictionary only when all downloads are complete? private static Dictionary<string, byte[]> ReturnedFileData(IEnumerable<string> urlList) { var returnList = new

问题 I'm trying to download a pdf file from https website, but it doesn't work. I'm new to C#, so did some research and found a simple code. Worse, the exception I get is quite generic. Help please. static void Main(string[] args) { string file_ = "https://www.nseindia.com/content/circulars/CMPT34469.pdf"; string path_ = @"E:\RSR\Office\EEP\FileDownloader\output\Hello_World.pdf"; WebClient wc_ = new WebClient(); wc_.DownloadFile(file_, path_); } The exception: An unhandled exception of type

问题 I'm going to make a DLL Library that'll alow developers to search and access IMDB movie pages. How should I handle the freezing in the GUI, should I use async methods, or should I allow a dev to manually create a thread for using our DLL? 回答1: This is entirely up to you. That being said, I think providing an asynchronous and a synchronous API will make your library act more like the framework libraries, which will give your users the best chance of using it correctly. For example, WebClient

问题 I've build simple method that downloads single file. When I call that method first time everything works fine, but when called second time file isn't downloaded. Below is my code: public void DownloadFile(string fileUrl, string path) { using (var webClient = new WebClient()) { webClient.DownloadFileCompleted += (sender, e) => { if (e.Error == null & !e.Cancelled) { Debug.WriteLine(@"Download completed!"); } }; var url = new Uri(fileUrl); try { webClient.OpenRead(url); string

问题 I have 5000+ pages I want to download using WebClient . Since I want that done as fast as possible I am trying to use multithreading (using BlockingCollection in my case), but the program always seems to be crashing after a while with error - "System.Net.WebException". If I add some Thread.Sleep(3000) delay it slows down my download process and it returns the error after a little more time. It usually takes about 2-3 seconds to download one page. Normally, I would guess that there is a

问题 So I'm following this tutorial: http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-net-client and I wonder how I can see whether the website where I connect to is offline. This is the code I've got HttpClient client = new HttpClient(); client.BaseAddress = new Uri("http://localhost:54932/"); client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json")); HttpResponseMessage response = client.GetAsync("api

问题 Have code for download page: System.Net.WebClient client = new System.Net.WebClient(); client.Headers.Add("user-agent", "Mozilla/20.0.1"); byte[] feedBytes; string url; url = @"http://www.marathonbet.co.uk/en/betting/Football"; string fullPage = string.Empty; try { feedBytes = client.DownloadData(url); } catch (System.Net.WebException) { return; } string fullPage = Encoding.UTF8.GetString(feedBytes); As result 'fullpage' contains only part of page. In the browser loading of the page happens