OpenWriteCompletedEventArgs Class
.NET Framework 4.5
Provides data for the OpenWriteCompleted event.
System.Object
System.EventArgs
System.ComponentModel.AsyncCompletedEventArgs
System.Net.OpenWriteCompletedEventArgs
System.EventArgs
System.ComponentModel.AsyncCompletedEventArgs
System.Net.OpenWriteCompletedEventArgs
Namespace: System.Net
Assembly: System (in System.dll)
The OpenWriteCompletedEventArgs type exposes the following members.
| Name | Description | |
|---|---|---|
 | Cancelled | Gets a value indicating whether an asynchronous operation has been canceled. (Inherited from AsyncCompletedEventArgs.) |
| Error | Gets a value indicating which error occurred during an asynchronous operation. (Inherited from AsyncCompletedEventArgs.) |
| Result | Gets a writable stream that is used to send data to a server. |
| UserState | Gets the unique identifier for the asynchronous task. (Inherited from AsyncCompletedEventArgs.) |
| Name | Description | |
|---|---|---|
| Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| RaiseExceptionIfNecessary | Raises a user-supplied exception if an asynchronous operation failed. (Inherited from AsyncCompletedEventArgs.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
Instances of this class are passed to OpenWriteCompletedEventHandler methods.
The following code example demonstrates opening a stream to write data to be uploaded.
public static void OpenResourceForPosting (string address)
{
WebClient client = new WebClient ();
Uri uri = new Uri(address);
// Specify that the OpenWriteCallback method gets called
// when the writeable stream is available.
client.OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
client.OpenWriteAsync (uri);
// Applications can perform other tasks
// while waiting for the upload to complete.
}
The following method is called when the stream is available.
private static void OpenWriteCallback2 (Object sender, OpenWriteCompletedEventArgs e)
{
Stream body = null;
StreamWriter s = null;
try
{
body = (Stream)e.Result;
s = new StreamWriter (body);
s.AutoFlush = true;
s.Write ("This is content data to be sent to the server.");
}
finally
{
if (s != null)
{
s.Close ();
}
if (body != null)
{
body.Close ();
}
}
}
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.
