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FileWebRequest.EndGetResponse Method

Ends an asynchronous request for a file system resource.

Namespace:  System.Net
Assembly:  System (in System.dll)

public override WebResponse EndGetResponse(
	IAsyncResult asyncResult
)

Parameters

asyncResult
Type: System.IAsyncResult

An IAsyncResult that references the pending request for a response.

Return Value

Type: System.Net.WebResponse
A WebResponse that contains the response from the file system resource.

ExceptionCondition
ArgumentNullException

asyncResult is null.

The EndGetResponse method completes an asynchronous request for a file system resource that was started with the BeginGetResponse method.

The following code example uses the EndGetResponse method to end an asynchronous request for a file system resource.


	public class RequestDeclare
	{
   	public FileWebRequest myFileWebRequest;	

 		public RequestDeclare()
		{
			myFileWebRequest = null;
		}
	}
	
	
	class FileWebRequest_resbeginend
	{

		public static ManualResetEvent allDone = new ManualResetEvent(false);

		static void Main(string[] args)
		{
			
		    if (args.Length < 1)
		    {
		       Console.WriteLine("\nPlease enter the file name as command line parameter:");
 		       Console.WriteLine("Usage:FileWebRequest_resbeginend <systemname>/<sharedfoldername>/<filename>\nExample:FileWebRequest_resbeginend shafeeque/shaf/hello.txt");
		    }  
		    else
		    {
		      try
            {


			      // Place a 'Webrequest'.
			      WebRequest myWebRequest= WebRequest.Create("file://"+args[0]);
			      // Create an instance of the 'RequestDeclare' and associating the 'myWebRequest' to it.		
			      RequestDeclare myRequestDeclare = new RequestDeclare();
			      myRequestDeclare.myFileWebRequest = (FileWebRequest)myWebRequest;
			  

			      // Begin the Asynchronous request for getting file content using 'BeginGetResponse()' method.	
			      IAsyncResult asyncResult =(IAsyncResult) myRequestDeclare.myFileWebRequest.BeginGetResponse(new AsyncCallback(RespCallback),myRequestDeclare);			
			      allDone.WaitOne();

	        
			   }
            catch(ArgumentNullException e)
			   {
			      Console.WriteLine("ArgumentNullException is :"+e.Message);
			   }
			   catch(UriFormatException e)
		      {
			      Console.WriteLine("UriFormatException is :"+e.Message);
		      }
		   }
		}

	  private static void RespCallback(IAsyncResult ar)
	  {	


			   // State of request is asynchronous.
				RequestDeclare requestDeclare=(RequestDeclare) ar.AsyncState;
					
				FileWebRequest  myFileWebRequest=requestDeclare.myFileWebRequest;
			
			   // End the Asynchronus request by calling the 'EndGetResponse()' method.
				
				FileWebResponse myFileWebResponse = (FileWebResponse) myFileWebRequest.EndGetResponse(ar);


			    // Reade the response into Stream.
				StreamReader streamReader= new StreamReader(myFileWebResponse.GetResponseStream());


				Char[] readBuffer = new Char[256];
					
				int count = streamReader.Read( readBuffer, 0, 256 );

				Console.WriteLine("The contents of the file are :\n");
		
				while (count > 0) 
				{
					String str = new String(readBuffer, 0, count);
					Console.WriteLine(str);
					count = streamReader.Read(readBuffer, 0, 256);
				}
				
				streamReader.Close();
				// Release the response object resources.
				myFileWebResponse.Close();
				allDone.Set();
				Console.WriteLine("File reading is over.");	
		}

	}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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