blocks|key|2756159|text|你可能想看看这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2756160|http://msdn.microsoft.com/en-us/library/system.web.ui.htmlcontrols.htmltextarea.aspx|offset|length|2756161|首先，不存在"class“属性。这是一个HTML控件；如果您想要服务器端访问，则需要添加runat="server“属性。有一个“残疾人”财产。还有一个“风格”属性。|2756162|您能否确切地解释一下您正在尝试做什么，以及为什么不使用TextBox，而将TextMode属性设置为多行？|2756163|entityMap|0|LINK|mutability|MUTABLE|url|1|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.textmode.aspx^0|0|0|2C|0|0|0|11|8|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|J|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]|Q|$5|M|N|O|A|$P|R]]]]

You might want to look at this:

<a href="http://msdn.microsoft.com/en-us/library/system.web.ui.htmlcontrols.htmltextarea.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.web.ui.htmlcontrols.htmltextarea.aspx</a>

For one, there is no "class" attribute. This is a HTML control; if you want server-side access, you need to add the runat="server" attribute. There is a "Disabled" property. There is also a "Style" property.

Can you explain exactly what it is you are trying to do and why you're not using a TextBox instead with the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.textmode.aspx" rel="nofollow">TextMode</a> property set to multiline?

blocks|key|2396315|text|对于任何可能还在寻找这类的人，我们可以在Application_Start期间在Global.asax中定义这个css类：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2396316|void+Application_Start(object+sender,+EventArgs+e)
{
++++WebControl.DisabledCssClass+=+"customDisabledClassName";
}|code-block|syntax|javascript|2396317|来源：WebControl.DisabledCssClass属性|offset|length|2396318|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webcontrol.disabledcssclass.aspx^0|0|0|3|T|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

For anyone that might still be looking for this, we can define this css class during Application_Start in the Global.asax:

<pre><code>void Application_Start(object sender, EventArgs e)
{
 WebControl.DisabledCssClass = "customDisabledClassName";
}
</code></pre>

Source: <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webcontrol.disabledcssclass.aspx" rel="noreferrer">WebControl.DisabledCssClass Property (MSDN)</a>

blocks|key|2756202|text|小心，在.net+4.5中，生成的html已经更改：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2756203|disabled="disabled"|code-block|syntax|javascript|2756204|不会总是出现，所以使用"aspNetDisabled“或定义的DisabledCssClass作为javascript或css。|2756205|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|$]]

Be careful, in .net 4.5 the generated html has changed :

<pre><code>disabled="disabled"
</code></pre>

Will not always be present, so use "aspNetDisabled" or the defined DisabledCssClass for javascript or css.

blocks|key|1199690|text|这是因为controlRenderingCompatibilityVersion。如果框架版本高于4，则此属性将设置为"pages+controlRenderingCompatibilityVersion=“4.0。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1199691|更改controlRenderingCompatibilityVersion="3.5“，您可以看到class="aspNetDisabled”将从html中删除。|1199692|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

That is because of controlRenderingCompatibilityVersion.
If your framework version is above 4, then this property will be set default to
"pages controlRenderingCompatibilityVersion="4.0" 

Change the controlRenderingCompatibilityVersion="3.5"
and you can see class="aspNetDisabled" will be removed from html.

blocks|key|1199736|text|最后，我执行了以下操作，这有效地删除了对禁用项的额外类的插入。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1199737|void+Application_Start(object+sender,+EventArgs+e)
{
++++//+Code+that+runs+on+application+startup
++++WebControl.DisabledCssClass+=+"";
}|code-block|syntax|javascript|1199738|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 ended up doing the following, which effectively removes the insertion of the extra class for disabled items.

<pre><code>void Application_Start(object sender, EventArgs e)
{
 // Code that runs on application startup
 WebControl.DisabledCssClass = "";
}
</code></pre>

blocks|key|2396390|text|乍一看，这似乎是(糟糕的)设计造成的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2396391|https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webcontrol.supportsdisabledattribute.aspx|offset|length|2396392|如果控件的SupportsDisabledAttribute属性为false，并且该控件被禁用，则ASP.NET将呈现的WebControl.DisabledCssClass元素的class属性设置为WebControl.DisabledCssClass属性值。WebControl.DisabledCssClass属性的默认值是"aspNetDisabled“。若要为禁用控件提供禁用外观，必须为由WebControl.DisabledCssClass属性值表示的类定义CSS规则。如果控件的CssClass属性中有一个值，则为控件呈现的HTML元素的类属性中可能有多个值。有关更多信息，请参见DisabledCssClass属性。|blockquote|2396393|奇怪的是，我在同一个网页中看到了disabled=“禁用”和class="aspNetDisabled“：https://www.dropbox.com/s/sv47x7yoqdzkzh4/Screenshot%25202016-10-24%252018.24.16.png?dl=0，我在那里有一个面板是禁用的，它似乎将disabled=”禁用“添加到其所有呈现的子(包括DropDownList+)中，除了我碰巧显式设置为Enabled="False”的ListBox子类，它似乎得到了class="aspNetDisabled“。当我启用父面板时，这些列表框在呈现时仍然使用class="aspNetDisabled“(而不是DropDownList似乎使用的disabled=”禁用“)，用户可以在其中选择一个项(它们没有禁用)。|2396394|因此，它看起来就像ListBox控件中的一个bug，它可能将"SupportsDisabledAttribute“设置为false，而DropDownList必须将其设置为true。如果是这样的话，这是愚蠢的，因为它们最终都呈现为"select"，默认情况下，ListBox+one只使用"size=4“显示4个项。|2396395|entityMap|0|LINK|mutability|MUTABLE|url|1|https://www.dropbox.com/s/sv47x7yoqdzkzh4/Screenshot%25202016-10-24%252018.24.16.png?dl=0^0|0|0|30|0|0|0|1H|2D|1|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|H|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|C]]|T|$5|P|Q|R|A|$S|U]]]]

at first look it seems that this is by (bad) design

<a href="https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webcontrol.supportsdisabledattribute.aspx" rel="nofollow">https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webcontrol.supportsdisabledattribute.aspx</a>

<blockquote>
 If the SupportsDisabledAttribute property of a control is false and
 the control is disabled, ASP.NET sets the class attribute of the
 rendered HTML element to the value of the WebControl.DisabledCssClass
 property. The default value of the WebControl.DisabledCssClass
 property is "aspNetDisabled". To provide a disabled appearance for
 disabled controls, you must define a CSS rule for the class that is
 represented by the value of the WebControl.DisabledCssClass property.
 The HTML element that is rendered for a control might have more than
 one value in its class attribute if there is a value in its CssClass
 property. For more information, see the DisabledCssClass property.
</blockquote>

it is strange that I see both disabled="disabled" and class="aspNetDisabled" in the same webpage:
<a href="https://www.dropbox.com/s/sv47x7yoqdzkzh4/Screenshot%202016-10-24%2018.24.16.png?dl=0" rel="nofollow">https://www.dropbox.com/s/sv47x7yoqdzkzh4/Screenshot%202016-10-24%2018.24.16.png?dl=0</a>
I have a panel there that is disabled and it seems to add disabled="disabled" to all its rendered children (including DropDownList ones), except for the ListBox ones that I happen to have explicitly set to Enabled="False", which seem to get class="aspNetDisabled". When I enable the parent panel, those listboxes when rendered still use class="aspNetDisabled" (instead of disabled="disabled" as DropDownList seems to use) and user can select an item in them (they're not disabled).

So it does look like a bug at ListBox control, probably it sets "SupportsDisabledAttribute" to false while DropDownList must be setting it to true. If it is so, this is silly, since they both end up rendered as "select", the ListBox one just using "size=4" to show 4 items by default

blocks|key|2396454|text|它可能存在Visual+框架问题。解决方案是您必须选择在其中创建项目的框架。要更改框架，请执行以下步骤。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2396455|1)右击特定项目->属性页。|2396456|📷|atomic|2396457|​|2396458|2)选择构建。|2396459|2396460|3)改变目标框架。|2396461|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/df74f80c6d2b147f402577edcbabe854.jpg|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/160b142b92336cd49118cca67b997663.jpg^0|C|5|0|0|0|1|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|K|3|L|5|6|7|1A|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1B|8|@]|D|@]|E|$]]|$1|O|3|I|5|J|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|P|3|Q|5|6|7|1G|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y|Z|-4]]|10|$5|U|V|W|E|$X|11|Z|-4]]]]

It may have Visual Studio Framework Problem.
Solution is that you have to select your Framework in which you made your project.
For changing framework follow the Step.

1) Right Click on Particular Project -> Property Pages.
<a href="https://i.stack.imgur.com/D99Yh.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/D99Yh.jpg" alt="enter image description here"></a>

2) Select Build.
<a href="https://i.stack.imgur.com/seEdl.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/seEdl.jpg" alt="enter image description here"></a>
3) Change Target Framework.

blocks|key|2756351|text|当您将Enabled="false“用于asp.net中的任何控件时，它会自动将css类"aspNetDisabled”与该控件绑定。如果您不想使用自动提供的类，您可以在.cs文件的第一步使用下面的代码行来实现这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2756352|System.Web.UI.WebControls.TextBox.DisabledCssClass+=+"CLASS_NAME_WHICH_YOU+WANT_TO_APPLY";|code-block|syntax|javascript|2756353|//或者您可以将其变为空白//，在上面的代码行中，我已经为TextBox控件做了此操作。如果您想申请其他控件，您也可以这样做：-|2756354|System.Web.UI.WebControls.CheckBox.DisabledCssClass+=+"CLASS_NAME_WHICH_YOU+WANT_TO_APPLY";|2756355|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|$]]

When you use Enabled="false" for any control in asp.net it automatically binds css class "aspNetDisabled" with that control. If you don't want to use the class provided automatically you can achieve this using below line of code at the very first step of you .cs file.

<pre><code>System.Web.UI.WebControls.TextBox.DisabledCssClass = "CLASS_NAME_WHICH_YOU WANT_TO_APPLY";
</code></pre>

// Or you can make it blank
// In above line of code I have done this for TextBox control. If you want to apply for other controls you can do this as well like:-

<pre><code>System.Web.UI.WebControls.CheckBox.DisabledCssClass = "CLASS_NAME_WHICH_YOU WANT_TO_APPLY";
</code></pre>

When I set the "Disabled" property of an ASP.NET TextBox control to false, the final rendered HTML textarea tag (sent to the browser) includes an 'class="aspNetDisabled"' attribute in addition to the 'disabled="disabled"' attribute. Where is the "aspNetDisabled" class defined?

It seems to me that it's not defined anywhere, and the real killer is that this useless class is interfering with my defined classes, because ASP.NET is rendering this into the control as a duplicate CSS class attribute:

<pre><code>&lt;textarea [...] disabled="disabled" class="aspNetDisabled" class="boxsizingBorder largeinput"&gt;
</code></pre>

Can anyone else confirm this bug?

<hr>

<h2>Additional Info</h2>

IIS Version: 7.0.6000.16386 
AppPool .NET Framework Version: v4.0 
Server control tag in ASPX page:

<pre><code>&lt;asp:TextBox ID="txtInput1" class="boxsizingBorder largeinput" runat="server" TextMode="MultiLine"&gt;&lt;/asp:TextBox&gt;.
</code></pre>

Where is the "aspNetDisabled" class defined and why does ASP.NET render an interfering duplicate CSS "class" attribute for it?

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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当我将ASP.NET TextBox控件的“禁用”属性设置为false时，最终呈现的HTML标记(发送到浏览器)除了“disabled=”禁用“”属性外，还包含一个‘class=“aspNetDisabled’属性。"aspNetDisabled“类在哪里定义？在我看来，它似乎没有在任何地方定义，真正的杀手是，这个无用...

问在哪里定义了"aspNetDisabled“类，为什么ASP.NET为它呈现一个干扰的重复的CSS " class”属性？
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问在哪里定义了"aspNetDisabled“类，为什么ASP.NET为它呈现一个干扰的重复的CSS " class”属性？EN