Renci SSH NET: Reflect width/height when resizing terminal

After days of investigation I ended up in implementing a new method into ShellStream.cs:

    /// <summary>
    /// Sends a "window-change" request.
    /// </summary>
    /// <param name="columns">The terminal width in columns.</param>
    /// <param name="rows">The terminal width in rows.</param>
    /// <param name="width">The terminal height in pixels.</param>
    /// <param name="height">The terminal height in pixels.</param>
    public void SendWindowChangeRequest(uint columns, uint rows, uint width, uint height)
    {
        if (_channel == null)
        {
            throw new ObjectDisposedException("ShellStream");
        }
        _channel.SendWindowChangeRequest(columns, rows, width, height);
    }

That solved the problem. Now I can call "SendWindowChangeRequest(...)" and the server-side shell window is up to date :-)

Not sure, why this feature is missing in Renci's implementation. Maybe there is still another way...

To solve the problem, I created an extension method that via reflection succeeds in calling the SendWindowChangeRequest method of the internal ChannelSession class (ShellStream have a private property called _channel).

using System.Reflection;
using Renci.SshNet;

namespace YourFavNamespace;

public static class ShellStreamExtension
{
    public static void SendWindowChangeRequest(this ShellStream stream, uint cols, uint rows, uint width, uint height)
    {
        // The shell stream is a private class, so we need
        // to use reflection to access its private fields and methods
        // The strategy is to get the _channel field from the ShellStream, and then
        // get the SendWindowChangeRequest method from the _channel field
        // for submitting low level requests to the shell stream to change its window size at runtime
        
        // get _channel from ShellStream by reflection
        var _channel = 
            stream.GetType().GetField("_channel", 
                BindingFlags.NonPublic | BindingFlags.Instance)?.GetValue(stream);
        
        // get SendWindowChangeRequest method from _channel by reflection
        var method = 
            _channel?.GetType().GetMethod("SendWindowChangeRequest", 
                BindingFlags.Public | BindingFlags.Instance);
        
        // invoke SendWindowChangeRequest method for change cols, rows, width and height of the shell stream
        method?.Invoke(_channel, new object[] { cols, rows, width, height });
    }
}