Is there a event that added data to the Stream?

mc 4,111

Is there event that when the stream data added it will triggered?

while(true)

{

offset+=m.Read(buffer,offset,1024);

}

can it be true that not use while when there is enough data it will read the stream and when I read the data the stream to be empty?

Zhi Lv - MSFT 32,106 Microsoft Vendor

Hi @mc

can it be true that not use while when there is enough data it will read the stream and when I read the data the stream to be empty?

Do you mean you want to read data only when it's available, and if the data is empty, it will break the while loop? If that is the case, you can try to use the following code:

   using (FileStream stream = new FileStream("example.txt", FileMode.Open))
        {
            byte[] buffer = new byte[1024];
            int bytesRead;

            while ((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) > 0)
            {
                // Process the read data here
                Console.WriteLine($"Read {bytesRead} bytes");
            }
        }

Or you can add an if condition in the while loop.

            using (FileStream stream = new FileStream("example.txt", FileMode.Open))
            {
                byte[] buffer = new byte[1024]; 
                //int bytesRead;
                int offset = 0;
                while (true)
                {
                    int bytesRead = await stream.ReadAsync(buffer, offset, buffer.Length - offset);

                    if (bytesRead == 0)
                    {
                        // Stream is empty, handle accordingly
                        break;
                    }

                    offset += bytesRead;

                    // Process the data as needed
                    Console.WriteLine($"Read {bytesRead} bytes");

                    // Reset the offset if needed
                    offset = 0;
                } 
            }

mc 4,111 Reputation points

2023-11-14T01:53:16.74+00:00

If I write to the stream in another thread the position is the length of the stream.and I will read nothing.
Zhi Lv - MSFT 32,106 Reputation points Microsoft Vendor

2023-11-14T06:47:51.7733333+00:00

Hi @mc

From your description, it seems that you attempt to write and read from the same stream at the same time, right? If that is the case, I'm not suggest you do that. Because, as we all known streams are not inherently thread-safe, if multiple threads try to read and write the stream simultaneously without synchronization, it can result in data corruption, unexpected exceptions or other issues. If you still want to do that, try to lock the stream when read or write the stream.
mc 4,111 Reputation points

2023-11-14T06:55:58.5333333+00:00

ok I know.I have to think another way.

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Is there a event that added data to the Stream?