我用这个。简单、干净、快捷!

txtTCPTxRx.AppendText(newText);

下面是我使用的实际代码

ThreadSafe(() =>
      {
          string newLog = $"{DateTime.Now:HH:mm:ss:ffff->}{dLog}{Environment.NewLine}";
          txtTCPTxRx.AppendText(newLog);
      });

关于皮特关于一个标签上的文本框的评论，我得到的工作方式是添加

textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();

到选项卡的Layout事件。

textBox1.Focus()
textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();

对我不起作用(Windows 8.1，不管是什么原因)。 由于我仍然使用。net 2.0，我不能使用ScrollToEnd。 但这是可行的:

public class Utils
{
    [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
    private static extern int SendMessage(System.IntPtr hWnd, int wMsg, System.IntPtr wParam, System.IntPtr lParam);

    private const int WM_VSCROLL = 0x115;
    private const int SB_BOTTOM = 7;

    /// <summary>
    /// Scrolls the vertical scroll bar of a multi-line text box to the bottom.
    /// </summary>
    /// <param name="tb">The text box to scroll</param>
    public static void ScrollToBottom(System.Windows.Forms.TextBox tb)
    {
        if(System.Environment.OSVersion.Platform != System.PlatformID.Unix)
             SendMessage(tb.Handle, WM_VSCROLL, new System.IntPtr(SB_BOTTOM), System.IntPtr.Zero);
    }


}

VB。NET:

Public Class Utils
    <System.Runtime.InteropServices.DllImport("user32.dll", CharSet := System.Runtime.InteropServices.CharSet.Auto)> _
    Private Shared Function SendMessage(hWnd As System.IntPtr, wMsg As Integer, wParam As System.IntPtr, lParam As System.IntPtr) As Integer
    End Function

    Private Const WM_VSCROLL As Integer = &H115
    Private Const SB_BOTTOM As Integer = 7

    ''' <summary>
    ''' Scrolls the vertical scroll bar of a multi-line text box to the bottom.
    ''' </summary>
    ''' <param name="tb">The text box to scroll</param>
    Public Shared Sub ScrollToBottom(tb As System.Windows.Forms.TextBox)
        If System.Environment.OSVersion.Platform <> System.PlatformID.Unix Then
            SendMessage(tb.Handle, WM_VSCROLL, New System.IntPtr(SB_BOTTOM), System.IntPtr.Zero)
        End If
    End Sub


End Class

我使用了一个函数:

private void Log (string s) {
    TB1.AppendText(Environment.NewLine + s);
    TB1.ScrollToCaret();
}

当文本被更改时，这将滚动到文本框的末尾，但仍然允许用户向上滚动

outbox.SelectionStart = outbox.Text.Length;
outbox.ScrollToEnd();

在Visual Studio Enterprise 2017上测试

您可以使用以下代码片段:

myTextBox.SelectionStart = myTextBox.Text.Length;
myTextBox.ScrollToCaret();

它会自动滚动到最后。