blocks|key|1452896|text|使用Int32.TryParse.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1452897|+int+integer;
+Int32.TryParse(Textbox.Text,+out+integer)|code-block|syntax|javascript|1452898|它将返回一个布尔值，以便您可以查看它们是否输入了有效的整数。|1452899|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.int32.tryparse.aspx^0|2|F|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Use <a href="http://msdn.microsoft.com/en-us/library/system.int32.tryparse.aspx" rel="noreferrer">Int32.TryParse.</a>

<pre><code> int integer;
 Int32.TryParse(Textbox.Text, out integer)
</code></pre>

It will return a bool so you can see if they entered a valid integer.

blocks|key|1238162|text|将正则表达式验证器附加到文本框并使其表达式如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1238163|%5E\d%2B$|code-block|syntax|javascript|1238164|当然，还要做服务器端的验证。|1238165|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|$]]

Attach a Regular Expression Validator to the text box and make its expression be this:

<pre><code>^\d+$
</code></pre>

And do your server side validation too, of course.

blocks|key|1453005|text|有几种不同的方法可以处理这个问题。您可以添加RequiredFieldValidator和RangeValidator+(如果适用于您的情况)，也可以添加CustomFieldValidator。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1453006|链接到CustomFieldValidator：http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator%2528VS.71%2529.aspx|offset|length|1453007|链接到有关ASP.NET验证的MSDN文章：http://msdn.microsoft.com/en-us/library/aa479045.aspx|1453008|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator%2528VS.71%2529.aspx|1|http://msdn.microsoft.com/en-us/library/aa479045.aspx^0|0|O|2P|0|0|M|1H|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]]]

There are several different ways you can handle this. You could add a RequiredFieldValidator as well as a RangeValidator (if that works for your case) or you could add a CustomFieldValidator.

Link to the CustomFieldValidator:
<a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator%28VS.71%29.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator%28VS.71%29.aspx</a>

Link to MSDN Article on ASP.NET Validation:
<a href="http://msdn.microsoft.com/en-us/library/aa479045.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/aa479045.aspx</a>

blocks|key|1238306|text|如果您只关心字段包含整数(即，不关心范围)，则添加一个CompareValidator，并将其Operator属性设置为DataTypeCheck|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1238307|<asp:CompareValidator+runat="server"+Operator="DataTypeCheck"+Type="Integer"+
+ControlToValidate="ValueTextBox"+ErrorMessage="Value+must+be+a+whole+number"+/>|code-block|syntax|javascript|1238308|如果存在特定范围的有效值(可能存在)，则可以使用RangeValidator，如下所示：|1238309|<asp:RangeValidator+runat="server"+Type="Integer"+
MinimumValue="0"+MaximumValue="400"+ControlToValidate="ValueTextBox"+
ErrorMessage="Value+must+be+a+whole+number+between+0+and+400"+/>|1238310|它们只会验证TextBox中是否有文本，因此您还需要将RequiredFieldValidator保存在那里。|1238311|正如@Mahin所说，确保检查服务器端的Page.IsValid属性，否则验证器只适用于启用了JavaScript的用户。|1238312|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.comparevalidator.aspx|1|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.comparevalidator.operator.aspx|2|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.rangevalidator.aspx|3|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.requiredfieldvalidator.aspx|4|https://stackoverflow.com/questions/1427629/asp-net-validation-to-make-sure-textbox-has-integer-values/1427670#1427670|5|http://msdn.microsoft.com/en-us/library/system.web.ui.page.isvalid.aspx^0|R|G|1B|8|1O|D|R|G|0|1B|8|1|0|0|O|E|O|E|2|0|0|R|M|R|M|3|0|K|C|2|6|4|K|C|5|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]]|D|@$9|1H|A|1I|1|1J]|$9|1K|A|1L|1|1M]]|E|$]]|$1|F|3|G|5|H|7|1N|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@$9|1R|A|1S|1|1T]]|E|$]]|$1|M|3|N|5|H|7|1U|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1V|8|@$9|1W|A|1X|B|C]]|D|@$9|1Y|A|1Z|1|20]]|E|$]]|$1|Q|3|R|5|6|7|21|8|@$9|22|A|23|B|C]]|D|@$9|24|A|25|1|26]|$9|27|A|28|1|29]]|E|$]]|$1|S|3|-4|5|6|7|2A|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]|12|$5|V|W|X|E|$Y|13]]|14|$5|V|W|X|E|$Y|15]]|16|$5|V|W|X|E|$Y|17]]|18|$5|V|W|X|E|$Y|19]]]]

If all that you are concerned about is that the field contains an integer (i.e., not concerned with a range), then add a <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.comparevalidator.aspx" rel="noreferrer"><code>CompareValidator</code></a> with it's <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.comparevalidator.operator.aspx" rel="noreferrer"><code>Operator</code></a> property set to <code>DataTypeCheck</code>:

<pre><code>&lt;asp:CompareValidator runat="server" Operator="DataTypeCheck" Type="Integer" 
 ControlToValidate="ValueTextBox" ErrorMessage="Value must be a whole number" /&gt;
</code></pre>

If there is a specific range of values that are valid (there probably are), then you can use a <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.rangevalidator.aspx" rel="noreferrer"><code>RangeValidator</code></a>, like so:

<pre><code>&lt;asp:RangeValidator runat="server" Type="Integer" 
MinimumValue="0" MaximumValue="400" ControlToValidate="ValueTextBox" 
ErrorMessage="Value must be a whole number between 0 and 400" /&gt;
</code></pre>

These will only validate if there is text in the TextBox, so you will need to keep the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.requiredfieldvalidator.aspx" rel="noreferrer"><code>RequiredFieldValidator</code></a> there, too.

As <a href="https://stackoverflow.com/questions/1427629/asp-net-validation-to-make-sure-textbox-has-integer-values/1427670#1427670">@Mahin</a> said, make sure you check the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.page.isvalid.aspx" rel="noreferrer"><code>Page.IsValid</code></a> property on the server side, otherwise the validator only works for users with JavaScript enabled.

blocks|key|1453077|text|<script+language="javascript"+type="text/javascript">
++++++++function+fixedlength(textboxID,+keyEvent,+maxlength)+{
++++++++++++//validation+for+digits+upto+'maxlength'+defined+by+caller+function
++++++++++++if+(textboxID.value.length+>+maxlength)+{
++++++++++++++++textboxID.value+=+textboxID.value.substr(0,+maxlength);
++++++++++++}
++++++++++++else+if+(textboxID.value.length+<+maxlength+%7C%7C+textboxID.value.length+==+maxlength)+{
++++++++++++++++textboxID.value+=+textboxID.value.replace(/[%5E\d]%2B/g,+'');
++++++++++++++++return+true;
++++++++++++}
++++++++++++else
++++++++++++++++return+false;
++++++++}
+</script>

<asp:TextBox+ID="txtNextVisit"+runat="server"+MaxLength="2"+onblur="return+fixedlength(this,+event,+2);"+onkeypress="return+fixedlength(this,+event,+2);"+onkeyup="return+fixedlength(this,+event,+2);"></asp:TextBox>+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1453078|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;script language="javascript" type="text/javascript"&gt;
 function fixedlength(textboxID, keyEvent, maxlength) {
 //validation for digits upto 'maxlength' defined by caller function
 if (textboxID.value.length &gt; maxlength) {
 textboxID.value = textboxID.value.substr(0, maxlength);
 }
 else if (textboxID.value.length &lt; maxlength || textboxID.value.length == maxlength) {
 textboxID.value = textboxID.value.replace(/[^\d]+/g, '');
 return true;
 }
 else
 return false;
 }
 &lt;/script&gt;

&lt;asp:TextBox ID="txtNextVisit" runat="server" MaxLength="2" onblur="return fixedlength(this, event, 2);" onkeypress="return fixedlength(this, event, 2);" onkeyup="return fixedlength(this, event, 2);"&gt;&lt;/asp:TextBox&gt; 
</code></pre>

blocks|key|1238366|text|这对我来说很好用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1238367|<asp:RegularExpressionValidator+ID="RegularExpressionValidator1"+runat="server"
+++++ControlToValidate="YourTextBoxID"
+++++ErrorMessage="Only+numeric+allowed."+ForeColor="Red"
+++++ValidationExpression="%5E[0-9]*$"+ValidationGroup="NumericValidate">*
</asp:RegularExpressionValidator>|code-block|syntax|javascript|1238368|我认为你也应该将ValidationGroup="NumericValidate"添加到提交按钮中。|offset|length|style|CODE|1238369|entityMap^0|0|0|8|X|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This works fine to me:

<pre><code>&lt;asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
 ControlToValidate="YourTextBoxID"
 ErrorMessage="Only numeric allowed." ForeColor="Red"
 ValidationExpression="^[0-9]*$" ValidationGroup="NumericValidate"&gt;*
&lt;/asp:RegularExpressionValidator&gt;
</code></pre>

I think you should add <code>ValidationGroup="NumericValidate"</code> to your submit button also.

blocks|key|1453176|text|你可以使用java脚本来实现这一点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1453177|<asp:TextBox+ID="textbox1"+runat="server"+Width="150px"+MaxLength="8"+onkeypress="if(event.keyCode<48+%7C%7C+event.keyCode>57)event.returnValue=false;"></asp:TextBox>|code-block|syntax|javascript|1453178|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|$]]

You can use java script for this:-

<pre><code>&lt;asp:TextBox ID="textbox1" runat="server" Width="150px" MaxLength="8" onkeypress="if(event.keyCode&lt;48 || event.keyCode&gt;57)event.returnValue=false;"&gt;&lt;/asp:TextBox&gt;
</code></pre>

blocks|key|1238437|text|双击您的按钮并使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1238438|protected+void+button_click(object+sender,EventArgs+e)
{
+int+parsedValue;
+if(int.TryParse(!txt.Text,out+parsedValue))
+{
+Label.Text+=+"Please+specify+a+number+only+!!";+//Will+put+a+text+in+a+label+so+make+++++
++++//sure++++++++++++++++
++//you+have+a+label
+}
+else
++{
++++//+do+what+you+want+to++
++}|code-block|syntax|javascript|1238439|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|$]]

Double click your button and use the following code :- 

<pre><code>protected void button_click(object sender,EventArgs e)
{
 int parsedValue;
 if(int.TryParse(!txt.Text,out parsedValue))
 {
 Label.Text = "Please specify a number only !!"; //Will put a text in a label so make 
 //sure 
 //you have a label
 }
 else
 {
 // do what you want to 
 }
</code></pre>

blocks|key|1238467|text|简单地添加以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1238468|<asp:FilteredTextBoxExtender+ID="txtAltitudeMin_FilteredTextBoxExtender"+runat="server"+Enabled="True"+TargetControlID="txtAltitudeMin"+FilterType="Numbers"></asp:FilteredTextBoxExtender>|offset|length|style|CODE|1238469|entityMap^0|0|0|57|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

simpally add this code: 

<code>&lt;asp:FilteredTextBoxExtender ID="txtAltitudeMin_FilteredTextBoxExtender" runat="server" Enabled="True" TargetControlID="txtAltitudeMin" FilterType="Numbers"&gt;&lt;/asp:FilteredTextBoxExtender&gt;</code>

blocks|key|1453264|text|在C#+asp.net+WebForms中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1453265|txtBoxNumber.Attributes.Add("onkeypress",+"javascript:if(event.which!=8+&&+event.which!=0+&&+(event.which<43+%7C%7C+event.which>57)){return+false;};");|code-block|syntax|javascript|1453266|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|$]]

In C# asp.net WebForms
<pre><code>txtBoxNumber.Attributes.Add(&quot;onkeypress&quot;, &quot;javascript:if(event.which!=8 &amp;&amp; event.which!=0 &amp;&amp; (event.which&lt;43 || event.which&gt;57)){return false;};&quot;);
</code></pre>

I have a required validation setup on a textbox, but I also have to make sure it is an integer.

How can I do this?

asp.net validation to make sure textbox has integer values

服务器

我在一个文本框上有一个必需的验证设置，但我还必须确保它是一个整数。我该怎么做呢？

问asp.net验证以确保textbox具有整数值
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