blocks|key|1165393|text|我怀疑ASPX页面的头与主体是分开处理的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1165394|这个问题很容易解决--您所需要做的就是使用代码隐藏中的类字段--将访问级别设置为受保护。|1165395|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|$]]

I suspect the head of the ASPX page gets processed separately from the body.

This problem is easily solved - all you need to do is use a class field in the code-behind with the access level set to protected.

blocks|key|2064381|text|在Web+.aspx文件中声明变量时，实际上是在自动生成的呈现方法中声明一个局部变量。ASP.NET为标记为runat="server"的所有标记生成单独的呈现方法，因此实际上为head元素提供了一个单独的方法。现在，您声明的变量只能存在于这些方法中的一种--因此出现了“怪异”行为。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2064382|您可以看到这是如何工作的，如果您的pre-compile+your+application+using+aspnet_compiler.exe.，您将得到编译的DLL文件，为您的每个网页；只要打开其中一个在反射器，以查看生成的代码。我用head标记外声明的变量编写了与您的代码相当的最小值，下面是我得到的顶级呈现方法：|2064383|private+void+__Render__control1(HtmlTextWriter+__w,+Control+parameterContainer)
{
++++string+str+=+"scripts/";
++++__w.Write("\r\n<!DOCTYPE+html+PUBLIC+\"-//W3C//DTD+XHTML+1.0+Transitional//EN\"+\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\r\n\r\n<html+xmlns=\"http://www.w3.org/1999/xhtml\">\r\n");
++++parameterContainer.Controls[0].RenderControl(__w);
++++__w.Write("\r\n<body>\r\n++++");
++++parameterContainer.Controls[1].RenderControl(__w);
++++__w.Write("\r\n++++<script+type=\"text/javascript\"+src=\"");
++++__w.Write(str);
++++__w.Write("jquery-1.4.1.min.js\"></script>\r\n</body>\r\n</html>\r\n");
}|code-block|syntax|javascript|2064384|您可以看到，我声明的变量(在这里名为str)的作用域是该方法，它正在调用其他方法来呈现head+(以及标记为runat="server"的表单元素)。|2064385|一个快速而肮脏的解决方案可能是从head标记中删除runat="server"；但是，我建议您在代码隐藏类中声明一个受保护的变量。将这样的行添加到代码隐藏文件中将有效：|2064386|protected+string+scriptPath,+gkoConfig;|2064387|然后，您可以在Web窗体代码中的任何地方使用这些变量。|2064388|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms227976%2528v=vs.85%2529.aspx^0|1I|E|0|H|1J|0|0|0|I|3|1I|E|0|P|E|0|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|@$9|16|A|17|1|18]]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|J|7|1I|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|1J|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

When you declare a variable in a Web Forms .aspx file, you’re actually declaring a local variable inside an auto-generated rendering method. ASP.NET generates separate rendering methods for all tags marked <code>runat="server"</code>, so you actually get a separate method for your head element. Now, the variable you declare can only exist in one of these methods - hence the 'weird' behavior.

You can see how this works if you <a href="http://msdn.microsoft.com/en-us/library/ms227976%28v=vs.85%29.aspx">pre-compile your application using aspnet_compiler.exe.</a> You will get compiled DLL files for each of your web forms pages; just open one of those up in Reflector to see the generated code. I wrote a minimal equivalent of your code with the variable declared outside the head tag, and here’s the top-level render method that I got:

<pre><code>private void __Render__control1(HtmlTextWriter __w, Control parameterContainer)
{
 string str = "scripts/";
 __w.Write("\r\n&lt;!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"&gt;\r\n\r\n&lt;html xmlns=\"http://www.w3.org/1999/xhtml\"&gt;\r\n");
 parameterContainer.Controls[0].RenderControl(__w);
 __w.Write("\r\n&lt;body&gt;\r\n ");
 parameterContainer.Controls[1].RenderControl(__w);
 __w.Write("\r\n &lt;script type=\"text/javascript\" src=\"");
 __w.Write(str);
 __w.Write("jquery-1.4.1.min.js\"&gt;&lt;/script&gt;\r\n&lt;/body&gt;\r\n&lt;/html&gt;\r\n");
}
</code></pre>

You see that the variable that I declared (here named <code>str</code>) is scoped to this method, and it's calling other methods to render the head (and a form element marked <code>runat="server"</code>.)

A quick and dirty solution might be to simply remove the <code>runat="server"</code> from your head tag; however, I’d recommend that you declare a protected variable in your code-behind class for this. Adding a line like this to your code-behind file would work:

<pre><code>protected string scriptPath, gkoConfig;
</code></pre>

You can then use these variables anywhere in your Web Forms code.

blocks|key|1165449|text|您还可以像这样声明常量：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1165450|<script+runat="server">
++++private+const+string+scriptPath+=+"assets/scripts/";
++++private+const+string+gkoConfig+=+"GkoConfig.js";
</script>|code-block|syntax|javascript|1165451|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 could also declare your constants like this:

<pre><code>&lt;script runat="server"&gt;
 private const string scriptPath = "assets/scripts/";
 private const string gkoConfig = "GkoConfig.js";
&lt;/script&gt;
</code></pre>

Why is that the <code>scriptPath</code> variable is out of scope in the bottom of the code?

Shouldn't it be in scope throughout this page? In MVC, if I mark this on top of the page like

<pre><code>@{
 string scriptPath = "assets/scripts/",
 gkoConfig = "GkoConfig.js";
}
</code></pre>

it is available throughout the current View. What am I missing now that I'm back to WebForms for a while?

<img src="https://i.stack.imgur.com/LbaKN.png" alt="enter image description here">

If I change the code position, It get's weirder as inside the <code>&lt;head&gt;</code> I no longer have access to teh variable, but I do have, inside the <code>&lt;body&gt;</code> now... :-/

<img src="https://i.stack.imgur.com/7fl0Z.png" alt="enter image description here">

Variable scope in aspx page

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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为什么scriptPath变量是在代码底部的超出作用域的？它不应该在整个页面的范围内吗？在MVC中，如果我在页面顶部标记如下@{    string scriptPath = "assets/scripts/",           gkoConfig = "GkoConfig.js";}它可在整个当前视图中使用。现在...

问aspx页面中的可变范围
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