IContentReadAsync Method

Task ReadAsync(
	Stream output,
	long startIndex,
	long count
)

Function ReadAsync ( 
	output As Stream,
	startIndex As Long,
	count As Long
) As Task

Task^ ReadAsync(
	Stream^ output, 
	long long startIndex, 
	long long count
)

abstract ReadAsync : 
        output : Stream * 
        startIndex : int64 * 
        count : int64 -> Task 

HttpContext.Current.Response.BufferOutput = false;

public virtual async Task ReadAsync(Stream output, long startIndex, long count)
{
    //Set timeout to maximum value to be able to download large files.
    HttpContext.Current.Server.ScriptTimeout = int.MaxValue;
    if (ContainsDownloadParam(context.Request.RawUrl))
    {
        AddContentDisposition(Name);
    }

    byte[] buffer = new byte[bufSize];
    using (FileStream fileStream = fileInfo.Open(FileMode.Open, FileAccess.Read, FileShare.Read))
    {
        fileStream.Seek(startIndex, SeekOrigin.Begin);
        int bytesRead;
        int toRead = (int)Math.Min(count, bufSize);
        if (toRead <= 0)
        {
            return;
        }

        try
        {
            bytesRead = await fileStream.ReadAsync(buffer, 0, toRead);
            while (bytesRead  > 0 && count > 0)
            {
                await output.WriteAsync(buffer, 0, bytesRead);
                count -= bytesRead;
                bytesRead = await fileStream.ReadAsync(buffer, 0, toRead);
            }
        }
        catch (HttpException)
        {
            // The remote host closed the connection (for example Cancel or Pause pressed).
        }
    }
}

Public Overridable Async Function ReadAsync(output As Stream, startIndex As Long, count As Long) As Task Implements IContent.ReadAsync
    'Set timeout to maximum value to be able to download large files.
    HttpContext.Current.Server.ScriptTimeout = Integer.MaxValue
    If ContainsDownloadParam(context.Request.RawUrl) Then
        AddContentDisposition(Name)
    End If

    Dim buffer As Byte() = New Byte(1048575) {}
    Using fileStream As FileStream = fileInfo.Open(FileMode.Open, FileAccess.Read, FileShare.Read)
        fileStream.Seek(startIndex, SeekOrigin.Begin)
        Dim bytesRead As Integer
        Dim toRead As Integer = CInt(Math.Min(count, bufSize))
        If toRead <= 0 Then
            Return
        End If

        Try
            bytesRead = Await fileStream.ReadAsync(buffer, 0, toRead)
            While bytesRead > 0 AndAlso count > 0
                Await output.WriteAsync(buffer, 0, bytesRead)
                count -= bytesRead
                bytesRead = Await fileStream.ReadAsync(buffer, 0, toRead)
            End While
        Catch __unusedHttpException1__ As HttpException
            ' The remote host closed the connection (for example Cancel or Pause pressed).
             End Try
    End Using
End Function

No code example is currently available or this language may not be supported.

No code example is currently available or this language may not be supported.

public virtual async Task ReadAsync(Stream output, long startIndex, long count)
{
    if (ContainsDownloadParam(context.Request.RawUrl))
    {
        AddContentDisposition(Name);
    }

    byte[] buffer = new byte[bufSize];
    await using (FileStream fileStream = fileInfo.Open(FileMode.Open, FileAccess.Read, FileShare.Read))
    {
        fileStream.Seek(startIndex, SeekOrigin.Begin);
        int bytesRead;
        int toRead = (int)Math.Min(count, bufSize);
        if (toRead <= 0)
        {
            return;
        }

        try
        {
            bytesRead = await fileStream.ReadAsync(buffer, 0, toRead);
            while (bytesRead  > 0 && count > 0)
            {
                await output.WriteAsync(buffer, 0, bytesRead);
                count -= bytesRead;
                bytesRead = await fileStream.ReadAsync(buffer, 0, toRead);
            }
        }
        catch (IOException)
        {
            // The remote host closed the connection (for example Cancel or Pause pressed).
        }
    }
}