textbox只显示指定行数 - Little_L

利用队列
private Queue<string> logQueue = new Queue<string>();
private const int logMax = 100;

public void Log(string logText)
{
    // this should only ever run for 1 loop as you should never go over logMax
    // but if you accidentally manually added to the logQueue - then this would
    // re-adjust you back down to the desired number of log items.
    while (logQueue.Count > logMax - 1)
        logQueue.Dequeue();

    logQueue.Enqueue(logText);
    textBox.Text = string.Join(Environment.NewLine, logQueue.ToArray());
}

来源：https://stackoverflow.com/questions/18988170/making-a-net-textbox-work-fifo-style