Export (0) Print
Expand All
This topic has not yet been rated - Rate this topic

OpenReadCompletedEventArgs Class

Provides data for the OpenReadCompleted event.

Namespace:  System.Net
Assembly:  System (in System.dll)
public class OpenReadCompletedEventArgs : AsyncCompletedEventArgs

The OpenReadCompletedEventArgs type exposes the following members.

  NameDescription
Public propertyCancelledGets a value indicating whether an asynchronous operation has been canceled. (Inherited from AsyncCompletedEventArgs.)
Public propertyErrorGets a value indicating which error occurred during an asynchronous operation. (Inherited from AsyncCompletedEventArgs.)
Public propertyResultGets a readable stream that contains data downloaded by a DownloadDataAsync method.
Public propertyUserStateGets the unique identifier for the asynchronous task. (Inherited from AsyncCompletedEventArgs.)
Top
  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodRaiseExceptionIfNecessaryRaises a user-supplied exception if an asynchronous operation failed. (Inherited from AsyncCompletedEventArgs.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Top

Instances of this class are passed to OpenReadCompletedEventHandler methods.

The following code example demonstrates downloading a resource for reading.

    public static void OpenResourceForReading2 (string address)
    {
        WebClient client = new WebClient ();
        Uri uri = new Uri(address);

        client.OpenReadCompleted += new OpenReadCompletedEventHandler(OpenReadCallback2);
        client.OpenReadAsync (uri);
    }

The following method is called when the download completes.

    private static void OpenReadCallback2 (Object sender, OpenReadCompletedEventArgs e)
    {
        Stream reply = null;
        StreamReader s = null;

        try
        {
            reply = (Stream)e.Result;
            s = new StreamReader (reply);
            Console.WriteLine (s.ReadToEnd ());
        }
        finally
        {
            if (s != null)
            {
                s.Close ();
            }

            if (reply != null)
            {
                reply.Close ();
            }
        }
    }

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft. All rights reserved.