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。

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

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);
      });

对于登陆这里希望看到webforms实现的其他人，您应该使用Page Request Manager的endRequest事件处理程序(https://stackoverflow.com/a/1388170/1830512)。以下是我在母版页的内容页中为我的文本框所做的，请忽略我没有为控件使用变量的事实:

var prm = Sys.WebForms.PageRequestManager.getInstance();

function EndRequestHandler() {
    if ($get('<%= ((TextBox)StatusWindow.FindControl("StatusTxtBox")).ClientID %>') != null) {
        $get('<%= ((TextBox)StatusWindow.FindControl("StatusTxtBox")).ClientID %>').scrollTop = 
        $get('<%= ((TextBox)StatusWindow.FindControl("StatusTxtBox")).ClientID %>').scrollHeight;
    }
}

prm.add_endRequest(EndRequestHandler);

我需要添加一个刷新:

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