blocks|key|1550696|text|您可以使用以下代码片段：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1550697|myTextBox.SelectionStart+=+myTextBox.Text.Length;
myTextBox.ScrollToCaret();|code-block|syntax|javascript|1550698|它将自动滚动到末尾。|1550699|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can use the following code snippet:

<pre><code>myTextBox.SelectionStart = myTextBox.Text.Length;
myTextBox.ScrollToCaret();
</code></pre>

which will automatically scroll to the end.

blocks|key|1550798|text|在.NET+4.0中，界面似乎发生了变化。下面的method可以实现上述所有功能。正如Tommy+Engebretsen建议的那样，将其放在TextChanged事件处理程序中会使其自动化。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1550799|textBox1.ScrollToEnd();|code-block|syntax|javascript|1550800|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/.NET_Framework|1|http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=EN-US&k=k%2528SYSTEM.WINDOWS.CONTROLS.PRIMITIVES.TEXTBOXBASE.SCROLLTOEND%2529;k%2528TargetFrameworkMoniker-%2522.NETFRAMEWORK,VERSION=V4.0%2522%2529;k%2528DevLang-CSHARP%2529&rd=true^0|1|4|0|O|6|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

It seems the interface has changed in <a href="http://en.wikipedia.org/wiki/.NET_Framework" rel="noreferrer">.NET</a> 4.0. There is the following <a href="http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&amp;l=EN-US&amp;k=k%28SYSTEM.WINDOWS.CONTROLS.PRIMITIVES.TEXTBOXBASE.SCROLLTOEND%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK,VERSION=V4.0%22%29;k%28DevLang-CSHARP%29&amp;rd=true" rel="noreferrer">method</a> that achieves all of the above. As Tommy Engebretsen suggested, putting it in a TextChanged event handler makes it automatic.

<pre><code>textBox1.ScrollToEnd();
</code></pre>

blocks|key|1550733|text|尝试将建议的代码添加到TextChanged事件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1550734|private+void+textBox1_TextChanged(object+sender,+EventArgs+e)
{
++textBox1.SelectionStart+=+textBox1.Text.Length;
++textBox1.ScrollToCaret();
}|code-block|syntax|javascript|1550735|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try to add the suggested code to the TextChanged event:

<pre><code>private void textBox1_TextChanged(object sender, EventArgs e)
{
 textBox1.SelectionStart = textBox1.Text.Length;
 textBox1.ScrollToCaret();
}
</code></pre>

blocks|key|1550951|text|textBox1.Focus()
textBox1.SelectionStart+=+textBox1.Text.Length;
textBox1.ScrollToCaret();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1550952|不适合我(Windows8.1，不管是什么原因)。|unstyled|1550953|因为我还在使用.NET+2.0，所以我不能使用ScrollToEnd。|1550954|但这是可行的：|1550955|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);
++++}


}|1550956|VB.NET：|1550957|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|1550958|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|Q|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<pre><code>textBox1.Focus()
textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();
</code></pre>

didn't work for me (Windows 8.1, whatever the reason). 
And since I'm still on .NET 2.0, I can't use ScrollToEnd.
 
But this works:

<pre><code>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;

 /// &lt;summary&gt;
 /// Scrolls the vertical scroll bar of a multi-line text box to the bottom.
 /// &lt;/summary&gt;
 /// &lt;param name="tb"&gt;The text box to scroll&lt;/param&gt;
 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);
 }


}
</code></pre>

VB.NET:

<pre><code>Public Class Utils
 &lt;System.Runtime.InteropServices.DllImport("user32.dll", CharSet := System.Runtime.InteropServices.CharSet.Auto)&gt; _
 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 = &amp;H115
 Private Const SB_BOTTOM As Integer = 7

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


End Class
</code></pre>

blocks|key|1550743|text|我需要添加一个刷新：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1550744|textBox1.SelectionStart+=+textBox1.Text.Length;
textBox1.ScrollToCaret();
textBox1.Refresh();|code-block|syntax|javascript|1550745|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I needed to add a refresh:

<pre><code>textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();
textBox1.Refresh();
</code></pre>

blocks|key|1551176|text|我用这个。简单，干净，快速！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1551177|txtTCPTxRx.AppendText(newText);|code-block|syntax|javascript|1551178|下面是我实际使用的代码|1551179|ThreadSafe(()+=>
++++++{
++++++++++string+newLog+=+$"{DateTime.Now:HH:mm:ss:ffff->}{dLog}{Environment.NewLine}";
++++++++++txtTCPTxRx.AppendText(newLog);
++++++});|1551180|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I use this. Simple, clean and fast!
<pre><code>txtTCPTxRx.AppendText(newText);
</code></pre>
Below is the actual code I use
<pre><code>ThreadSafe(() =&gt;
 {
 string newLog = $&quot;{DateTime.Now:HH:mm:ss:ffff-&gt;}{dLog}{Environment.NewLine}&quot;;
 txtTCPTxRx.AppendText(newLog);
 });
</code></pre>

blocks|key|1335511|text|当文本更改时，这将滚动到文本框的末尾，但仍允许用户向上滚动|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335512|outbox.SelectionStart+=+outbox.Text.Length;
outbox.ScrollToEnd();|code-block|syntax|javascript|1335513|在Visual+Studio+Enterprise+2017上测试|1335514|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This will scroll to the end of the textbox when the text is changed, but still allows the user to scroll up

<pre><code>outbox.SelectionStart = outbox.Text.Length;
outbox.ScrollToEnd();
</code></pre>

tested on Visual Studio Enterprise 2017

blocks|key|1551093|text|对于在这里登录并希望看到webforms实现的其他任何人，您都希望使用Page+Request+Manager的endRequest事件处理程序(https://stackoverflow.com/a/1388170/1830512)。下面是我在来自母版页的内容页中对我的TextBox所做的事情，请忽略我没有为控件使用变量的事实：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1551094|var+prm+=+Sys.WebForms.PageRequestManager.getInstance();

function+EndRequestHandler()+{
++++if+($get('<%25=+((TextBox)StatusWindow.FindControl("StatusTxtBox")).ClientID+%25>')+!=+null)+{
++++++++$get('<%25=+((TextBox)StatusWindow.FindControl("StatusTxtBox")).ClientID+%25>').scrollTop+=+
++++++++$get('<%25=+((TextBox)StatusWindow.FindControl("StatusTxtBox")).ClientID+%25>').scrollHeight;
++++}
}

prm.add_endRequest(EndRequestHandler);|code-block|syntax|javascript|1551095|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/1388170/1830512^0|21|17|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

For anyone else landing here expecting to see a webforms implementation, you want to use the Page Request Manager's endRequest event handler (<a href="https://stackoverflow.com/a/1388170/1830512">https://stackoverflow.com/a/1388170/1830512</a>). Here's what I did for my TextBox in a Content Page from a Master Page, please ignore the fact that I didn't use a variable for the control:

<pre><code>var prm = Sys.WebForms.PageRequestManager.getInstance();

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

prm.add_endRequest(EndRequestHandler);
</code></pre>

blocks|key|1551139|text|关于Pete关于选项卡上的TextBox的评论，我的工作方式是添加|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1551140|textBox1.SelectionStart+=+textBox1.Text.Length;
textBox1.ScrollToCaret();|code-block|syntax|javascript|1551141|添加到选项卡的布局事件。|1551142|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

With regards to the comment by Pete about a TextBox on a tab, the way I got that to work was adding
<pre><code>textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();
</code></pre>
to the tab's Layout event.

blocks|key|1335339|text|这只对我有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335340|txtSerialLogging->Text+=+""；|1335341|txtSerialLogging->AppendText(s)；|1335342|我尝试了上面所有的情况，但问题是在我的情况下，文本s可以减少，增加，也可以长时间保持不变。静态表示，静态长度(行)但内容不同。|1335343|所以，当长度(线)在一段时间内保持不变时，我面临着一种跳线的情况。|1335344|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

This only worked for me... 

txtSerialLogging->Text = "";

txtSerialLogging->AppendText(s);

I tried all the cases above, but the problem is in my case text s can decrease, increase and can also remain static for a long time.
static means , static length(lines) but content is different.

So, I was facing one line jumping situation at the end when the length(lines) remains same for some times...

blocks|key|1550872|text|为此，我使用了一个函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1550873|private+void+Log+(string+s)+{
++++TB1.AppendText(Environment.NewLine+%2B+s);
++++TB1.ScrollToCaret();
}|code-block|syntax|javascript|1550874|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I use a function for this :

<pre><code>private void Log (string s) {
 TB1.AppendText(Environment.NewLine + s);
 TB1.ScrollToCaret();
}
</code></pre>

I have a textbox with the .Multiline property set to true. At regular intervals, I am adding new lines of text to it. I would like the textbox to automatically scroll to the bottom-most entry (the newest one) whenever a new line is added. How do I accomplish this?

How do I automatically scroll to the bottom of a multiline text box?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个.Multiline属性设置为true的textbox。每隔一段时间，我就会向其中添加新的文本行。我希望每当添加新行时，文本框都能自动滚动到最底部的条目(最新的条目)。我该如何做到这一点？

问如何自动滚动到多行文本框的底部？
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问如何自动滚动到多行文本框的底部？
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