C# WebClient.Dispose方法代码示例

 static void Main()
 {
     WebClient webClient = new WebClient();
     Console.WriteLine("Enter file url: ");
     string downloadSource = Console.ReadLine();
     Console.WriteLine("Enter destination on local hard drive. Specify file name and extension: ");
     string downloadDestination = Console.ReadLine();
     try
     {
         webClient.DownloadFile(downloadSource, downloadDestination);
     }
     catch (System.Net.WebException)
     {
         Console.WriteLine("Error accessing the network.");
     }
     catch (System.NotSupportedException)
     {
         Console.WriteLine("Method not supported or failed attempt to read, seek or write to a stream.");
     }
     catch (ArgumentNullException)
     {
         Console.WriteLine("A null reference cannot be accepted by this method!");
     }
     catch (ArgumentException)
     {
         Console.WriteLine("The path you entered is invalid.");
     }
     finally
     {
         webClient.Dispose();
     }
 }

    static void Main()
    {
        WebClient webClient = new WebClient();
        string linkToFile = @"http://www.devbg.org/img/Logo-BASD.jpg";
        try
        {
            webClient.DownloadFile( linkToFile,"logo.jpg");
        }

        catch (ArgumentNullException)
        {
            Console.WriteLine("You can't use null arguments");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("'{0}' is a wrong path", linkToFile);
        }
        catch (NotSupportedException)
        {
            Console.WriteLine("Use different slashes for this operating system");
        }
        catch (WebException)
        {
            Console.WriteLine("Not file specified to save to");
        }
        finally
        {
            webClient.Dispose();
        }
    }

    static void Main()
    {
        WebClient webClient = new WebClient();

            using (webClient)
            {
                try
                {
                    Console.WriteLine("Downloading file...");
                    webClient.DownloadFile("http://www.devbg.org/img/Logo-BASD.jpg", @"d:\myfile.jpg");
                    Console.WriteLine("Done.");
                }
                catch (ArgumentNullException an)
                {
                    Console.WriteLine("ArgumentNullException: " + an.Message);
                }
                catch (ArgumentException ae)
                {
                    Console.WriteLine("ArgumentException: " + ae.Message);
                }
                catch (WebException we)
                {
                    Console.WriteLine("WebException: " + we.Message);
                }
                catch (NotSupportedException ns)
                {
                    Console.WriteLine("NotSupportedException: " + ns.Message);
                }
                finally
                {
                    webClient.Dispose();
                    GC.Collect();
                }
            }
    }

 static void Main()
 {
     string decorationLine = new string('-', 80);
     Console.Write(decorationLine);
     Console.WriteLine("***Downloading a file from Internet and storing it in the current directory***");
     Console.Write(decorationLine);
     WebClient webClient = new WebClient();
     try
     {
         string remoteUri = "http://www.telerik.com/images/newsletters/academy/assets/";
         string fileName = "ninja-top.gif";
         string fullFilePathOnWeb = remoteUri + fileName;
         webClient.DownloadFile(fullFilePathOnWeb, fileName);
         Console.WriteLine("Downloading '{0}' from {1} is completed!", fileName, remoteUri);
         Console.WriteLine("You can find it in {0}.", Environment.CurrentDirectory);
     }
     catch (ArgumentNullException)
     {
         Console.WriteLine("No file address is given!");
     }
     catch (WebException webException)
     {
         Console.WriteLine(webException.Message);
     }
     catch (NotSupportedException)
     {
         Console.WriteLine("Downloading a file is in process! Cannot download multiple \nfiles simultaneously!");
     }
     finally
     {
         webClient.Dispose();
     }
 }

 static void Main()
 {
     using (WebClient webCl = new WebClient())
     {
         try
         {
             Console.WriteLine("Write a program that downloads a file from Internet (e.g. http://www.devbg.org/img/Logo-BASD.jpg) and stores it the current directory. Find in Google how to download files in C#. Be sure to catch all exceptions and to free any used resources in the finally block.");
             Console.WriteLine();
             webCl.DownloadFile("http://www.devbg.org/img/Logo-BASD.jpg", "image.jpg");
             Console.WriteLine("Download Complete.");
         }
         catch (System.Net.WebException)
         {
             Console.WriteLine("Error downloading file.");
         }
         catch (System.ArgumentException)
         {
             Console.WriteLine("Wrong path");
         }
         finally
         {
             webCl.Dispose();
         }
     }
 }

 static void Main()
 {
     Console.WriteLine("Enter the URL of the which you want to download:\nExample: \"http://www.d3bg.org/img/upload/tamplier/01.jpg\" ");
     Uri uri = new Uri(Console.ReadLine());
     string fileName = System.IO.Path.GetFileName(uri.LocalPath);
     WebClient webClient = new WebClient();
     try
     {
         // "../../" changes the default location of the downloaded file to two directories above!
         webClient.DownloadFile(uri, "../../" + fileName);
         Console.WriteLine("The file was successfully downloaded!\n!");
     }
     catch (WebException)
     {
         Console.WriteLine("Invalid adress or empty file.");
     }
     catch (NotSupportedException)
     {
         Console.WriteLine("");
     }
     finally
     {
         webClient.Dispose();
     }
 }

    static void Main()
    {
        string remoteUri = "http://telerikacademy.com/Content/Images/";
        string fileName = "news-img01.png";
        string webResource = null;
        WebClient myWebClient = new WebClient();
        webResource = remoteUri + fileName;


        Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n", fileName, webResource);
        try
        {
            myWebClient.DownloadFile(webResource, fileName);
            Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, webResource);
        }
        catch (ArgumentNullException)
        {
            Console.WriteLine("No address given.");
        }
        catch (WebException)
        {
            Console.WriteLine("The file does not exist or the name is empty.");
        }
        catch (NotSupportedException)
        {
            Console.WriteLine("The method has been called simultaneously on multiple threads.");
        }
        finally
        {
            myWebClient.Dispose();
        }
        Console.WriteLine();
    }

 static void Main()
 {
     string fileName="news-img01.png";
     string path = GetSavePath(fileName);
     string address = "http://telerikacademy.com/Content/Images/news-img01.png";
     WebClient client = new WebClient();
     try
     {
         client.DownloadFile(address, path);
         Console.WriteLine("File saved in {0}", path);
     }
     catch (ArgumentNullException)
     {
         Console.WriteLine("The address can not be null");
     }
     catch (WebException)
     {
         Console.WriteLine("Invalid address or file name.");
     }
     catch (NotSupportedException)
     {
         Console.WriteLine("Simultaneous downloads are not supported.");
     }
     finally
     {
         client.Dispose();
     }
 }

 private static void ReadAndDownloadFile()
 {
     WebClient wc = new WebClient();
     try
     {
         string link = @"http://www.devbg.org/img/Logo-BASD.jpg";
         wc.DownloadFile(link, "../../pic.jpg");
     }
     catch (ArgumentNullException ane)
     {
         Console.WriteLine(ane.Message);
     }
     catch (WebException we)
     {
         Console.WriteLine(we.Message);
     }
     catch (NotSupportedException nse)
     {
         Console.WriteLine(nse.Message);
     }
     finally
     {
         wc.Dispose();
     }
 }

    static void Main()
    {
        Console.Write("Please enter the path: ");
        string path = Console.ReadLine();
        string fileName = "ninja.gif";
        WebClient myWebClient = new WebClient();

        try
        {
            myWebClient.DownloadFile(path, fileName);
            Console.WriteLine(@"The file is downloaded in Project\bin\Debug!");
        }
        catch (WebException)
        {
            Console.WriteLine("The adress is invalid.");
        }
        catch (ArgumentNullException)
        {
            Console.WriteLine("The address parameter is null.");
        }
        catch (NotSupportedException)
        {
            Console.WriteLine("The method has been called simultaneously on multiple threads.");
        }
        finally
        {
            myWebClient.Dispose();
        }
    }

    static void Main()
    {
        Console.WriteLine("Task 04 - Download a file from given URI\n\n");

        string uri = "http://www.devbg.org/img/Logo-BASD.jpg";

        Console.WriteLine();

        Console.Write("Please enter full URI to download (or press enter for default): ");
        string file = Console.ReadLine();
        if (file.Length == 0) file = uri;
        WebClient client = null;
        try
        {
            string filename = Path.GetFullPath(".") + @"\" + Path.GetFileName(file);
            Console.WriteLine("\nDownloading {0}\n\nDestination: {1}\n\n", file, filename);
            client = new WebClient();
            client.DownloadFile(file, filename);
        }
        catch (SystemException se)
        {
            Console.WriteLine("Exception: " + se.Message);
        }
        finally
        {
            if (client != null) client.Dispose();
        }

        Console.WriteLine("\n\nPress Enter to finish");
        Console.ReadLine();
    }

 static void Main()
 {
     WebClient client = new WebClient();
     try
     {
         client.DownloadFile("http://telerikacademy.com/Content/Images/news-img01.png", "ninja.png");
     }
     catch (UriFormatException e)
     {
         Console.WriteLine(e.Message);
     }
     catch (HttpListenerException e)
     {
         Console.WriteLine(e.Message);
     }
     catch (WebException e)
     {
         Console.WriteLine(e.Message);
     }
     catch (UnauthorizedAccessException e)
     {
         Console.WriteLine(e.Message);
     }
     catch (NotSupportedException e)
     {
         Console.WriteLine(e.Message);
     }
     finally
     {
         client.Dispose();
     }
 }

 static void Main(string[] args)
 {
     WebClient downloader = new WebClient();
     string uri = "http://www.devbg.org/img/Logo-BASD.jpg";
     string destination = Directory.GetCurrentDirectory() + @"\Logo-BASD.jpg";
     try
     {
         downloader.DownloadFile(uri, destination);
     }
     catch (WebException we)
     {
         Console.WriteLine(we.Message);
     }
     catch (NotSupportedException nse)
     {
         Console.WriteLine(nse.Message); ;
     }
     catch (ArgumentException ae)
     {
         Console.WriteLine(ae.Message);
     }
     finally
     {
         downloader.Dispose();
     }
 }

    private DateTime GetTimeFromDDG()
    {
        //https://duckduckgo.com/?q=what+time+is+it
        WebClient wc = new WebClient();
        try
        {
            char[] separators = new char[] { '<', '>', '\\', '/', '|' };

            string timeisPage = wc.DownloadString("https://duckduckgo.com/html/?q=what%20time%20is%20it");
            timeisPage = timeisPage.Remove(0, timeisPage.IndexOf("\n\n\t\n\n\n\n            ") + 19);
            string[] timeisSplit = timeisPage.Split(separators, StringSplitOptions.RemoveEmptyEntries);
            string Time = timeisSplit[0].Remove(timeisSplit[0].Length - 5);
            DateTime result;
            if (DateTime.TryParse(Time, out result))
            {
                return result;//.ToString("t");
            }
            throw new Exception();
        }
        catch
        {
            return DateTime.Now;//.ToString("t");
        }
        finally
        {
            wc.Dispose();
            GC.Collect();
        }
    }

    static void Main()
    {
        WebClient client = new WebClient();

        try
        {
            string adressAsString = "http://www.devbg.org/img/Logo-BASD.jpg";

            string location = "Image.jpg";

            client.DownloadFile(adressAsString, location);

            Console.WriteLine("The download is complete. You can find your file in bin/Debug");
        }
        catch (ArgumentNullException)
        {
            Console.WriteLine("The adress parameter is with null value");
        }
        catch (WebException)
        {
            Console.WriteLine("Invalid adress, the file name is empty or null, or the file does not exist");
        }
        catch (NotSupportedException)
        {
            Console.WriteLine("The method has been called simultaneously on multiple targets");
        }
        finally
        {
            client.Dispose();
        }
    }