IResource.WriteToStream Method

Writes the content of the resource to the specified stream.

[Visual Basic]
Function WriteToStream( _
   ByVal output As Stream, _
   ByVal startIndex As Long, _
   ByVal count As Long _
) As WebDAVResponse

[C#]
WebDAVResponse WriteToStream(
   Stream output,
   long startIndex,
   long count
);

Parameters

output: Output stream.
startIndex: The zero-bazed byte offset in resource content at which to begin copying bytes to the output stream.
count: The number of bytes to be written to the output stream.

Return Value

OkResponse - Operation succeeded.

Remarks

By default ASP.NET buffers content on server side before sending output. You must turn off buffering to eliminate keeping entire file content in memory before sending:

HttpContext.Current.Response.BufferOutput = false;

Client application can request only a part of a resource specifying Range header. Download managers may use this header to download single file using several threads at a time.

Example

    public WebDAVResponse WriteToStream(Stream output, long byteStart, long count)
    {
        System.Web.HttpContext.Current.Server.ScriptTimeout = 1200;

        SqlConnection conn = new SqlConnection(connStr);
        SqlCommand cmd;
        SqlDataReader reader = null;
        conn.Open();

        try
        {
            cmd = conn.CreateCommand();
            cmd.CommandText = "SELECT Content FROM Repository WHERE ID = @ID";
            cmd.Parameters.Add("@ID", SqlDbType.Int).Value = ID;
        
            reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess);
            reader.Read();
            
            long bufSize = 1048576; // 1Mb
            byte[] buf = new byte[bufSize];
            long retval;
            long startIndex = byteStart;
            
            while ((retval = reader.GetBytes(reader.GetOrdinal("Content"), 
                startIndex, buf, 0, (int)(count>bufSize ? bufSize : count) )) > 0)
            {
                try
                {
                    output.Write(buf, 0, (int)retval);
                }
                catch (System.Web.HttpException)
                { // The remote host closed the connection
                    return new OkResponse();
                }
                startIndex += retval;
                count-=retval;
            }
        }
        finally
        {
            if(reader != null) reader.Close();
            conn.Close();
        }
        
        return new OkResponse();
    }