FileStream.EndRead(IAsyncResult) Method
Definition
Important
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Waits for the pending asynchronous read operation to complete. (Consider using ReadAsync(Byte[], Int32, Int32, CancellationToken) instead.)
public:
override int EndRead(IAsyncResult ^ asyncResult);public override int EndRead (IAsyncResult asyncResult);override this.EndRead : IAsyncResult -> intPublic Overrides Function EndRead (asyncResult As IAsyncResult) As IntegerParameters
- asyncResult
- IAsyncResult
The reference to the pending asynchronous request to wait for.
Returns
The number of bytes read from the stream, between 0 and the number of bytes you requested. Streams only return 0 at the end of the stream, otherwise, they should block until at least 1 byte is available.
Exceptions
asyncResult is null.
This IAsyncResult object was not created by calling BeginRead(Byte[], Int32, Int32, AsyncCallback, Object) on this class.
EndRead(IAsyncResult) is called multiple times.
The stream is closed or an internal error has occurred.
Examples
This code example is part of a larger example provided for the FileStream(String, FileMode, FileAccess, FileShare, Int32, Boolean) constructor.
static void EndReadCallback( IAsyncResult^ asyncResult )
{
State^ tempState = dynamic_cast<State^>(asyncResult->AsyncState);
int readCount = tempState->FStream->EndRead( asyncResult );
int i = 0;
while ( i < readCount )
{
if ( tempState->ReadArray[ i ] != tempState->WriteArray[ i++ ] )
{
Console::WriteLine( "Error writing data." );
tempState->FStream->Close();
return;
}
}
Console::WriteLine( "The data was written to {0} "
"and verified.", tempState->FStream->Name );
tempState->FStream->Close();
// Signal the main thread that the verification is finished.
tempState->ManualEvent->Set();
}
public:
static void EndReadCallback(IAsyncResult asyncResult)
{
State tempState = (State)asyncResult.AsyncState;
int readCount = tempState.FStream.EndRead(asyncResult);
int i = 0;
while(i < readCount)
{
if(tempState.ReadArray[i] != tempState.WriteArray[i++])
{
Console.WriteLine("Error writing data.");
tempState.FStream.Close();
return;
}
}
Console.WriteLine("The data was written to {0} and verified.",
tempState.FStream.Name);
tempState.FStream.Close();
// Signal the main thread that the verification is finished.
tempState.ManualEvent.Set();
}
let endReadCallback (asyncResult: IAsyncResult) =
let tempState = asyncResult.AsyncState :?> State
let readCount = tempState.FStream.EndRead asyncResult
let mutable i = 0
let mutable errored = false
while i < readCount do
if tempState.ReadArray[i] <> tempState.WriteArray[i] then
printfn "Error writing data."
tempState.FStream.Close()
errored <- true
i <- readCount
i <- i + 1
printfn $"The data was written to {tempState.FStream.Name} and verified."
tempState.FStream.Close()
// Signal the main thread that the verification is finished.
tempState.ManualEvent.Set() |> ignore
Private Shared Sub EndReadCallback(asyncResult As IAsyncResult)
Dim tempState As State = _
DirectCast(asyncResult.AsyncState, State)
Dim readCount As Integer = _
tempState.FStream.EndRead(asyncResult)
Dim i As Integer = 0
While(i < readCount)
If(tempState.ReadArray(i) <> tempState.WriteArray(i))
Console.WriteLine("Error writing data.")
tempState.FStream.Close()
Return
End If
i += 1
End While
Console.WriteLine("The data was written to {0} and " & _
"verified.", tempState.FStream.Name)
tempState.FStream.Close()
' Signal the main thread that the verification is finished.
tempState.ManualEvent.Set()
End Sub
Remarks
In the .NET Framework 4 and earlier versions, you have to use methods such as BeginRead and EndRead to implement asynchronous file operations. These methods are still available in the .NET Framework 4.5 to support legacy code; however, the new async methods, such as ReadAsync, WriteAsync, CopyToAsync, and FlushAsync, help you implement asynchronous file operations more easily.
EndRead must be called exactly for every call to BeginRead. Failing to end a read process before beginning another read can cause undesirable behavior such as deadlock.
This method overrides EndRead.
EndRead can be called on every IAsyncResult from BeginRead. Calling EndRead tells you how many bytes were read from the stream. EndRead will block until the I/O operation has completed.
