Web窗体错误消息：＆QUOT;这不是scriptlet而。会为纯文本＆QUOT输出; [英] Web Forms error message: "This is not scriptlet. Will be output as plain text"
问题描述
在我的ASP .NET Web窗体我有以下声明code：
In my ASP .NET Web Forms I have the following declarative code:
<asp:TextBox runat="server" ID="txtbox" CssClass='<%=TEXTBOX_CSS_CLASS%>' />
恒TEXTBOX_CSS_CLASS是一个基类，页面的code-behind类继承自定义的：
The constant TEXTBOX_CSS_CLASS is defined in a base class that the page's code-behind class inherits from:
public class MyPageBase : Page
{
protected internal const string TEXTBOX_CSS_CLASS = "myClass";
}
编辑 - 编译时间不过警告我说，这不是scriptlet而[原文]。将输出为纯文本。
言而有信，CSS类呈现为字面意思是＆LT;％= TEXTBOX_CSS_CLASS％>
The edit-time compiler however warns me that "This is not scriptlet [sic]. Will output as plain text". True to its word, the css class is rendered as literally "<%=TEXTBOX_CSS_CLASS%>".
这是什么错误讯息，并有一种解决方法，所以我仍然可以使用一个不变的基类？
What does this error message mean and is there a workaround so I can still use a constant in a base class?
推荐答案
您不能使用＆LT;％= ......％＆GT; 来设置服务器端的性能控制。
内联前pressions ＆LT;％％GT; 只能在使用
ASPX页面或用户控件的顶级文档级，但不能中镶嵌
服务器控件的标记属性（如＆LT; ASP：按钮...文本= LT;％％GT; ..＆GT; ）。
You cannot use <%= ... %> to set properties of server-side controls.
Inline expressions <% %> can only be used at
aspx page or user control's top document level, but can not be embeded in
server control's tag attribute (such as <asp:Button... Text =<% %> ..>).
如果您的文本框里面是一个数据绑定控件如GridView，ListView控件..你可以使用：＆LT;％＃％＆GT; 语法。或者你可以显式调用的DataBind（）从控制code-背后或内联服务器脚本。
If your TextBox is inside a DataBound controls such as GridView, ListView .. you can use: <%# %> syntax. OR you can call explicitly DataBind() on the control from code-behind or inline server script.
<asp:TextBox runat="server" ID="txtbox" class='<%# TEXTBOX_CSS_CLASS %>' />
// code Behind文件
// code Behind file
protected void Page_Load(object sender, EventArgs e)
{
txtbox.DataBind();
}
ASP.NET包括一些内置的前pression建设者，让您从的web.config 文件中提取自定义应用程序设置和连接字符串信息。例如：
ASP.NET includes few built-in expression builders that allows you to extract custom application settings and connection string information from the web.config file. Example:
- 资源
- 的ConnectionStrings
- 的AppSettings
所以，如果你想取得一个名为应用程序设置的className 从＆LT;的appSettings＆GT;的部分的web.config 文件，可以使用下面的前pression：
So, if you want to retrieve an application setting named className from the <appSettings> portion of the web.config file, you can use the following expression:
<asp:TextBox runat="server" Text="<%$ AppSettings:className %>" />
然而，上述片段是不是从阅读的appSettings类名的标准。
However, above snippet isn't a standard for reading classnames from Appsettings.
您可以创建并使用自己的自定义防爆pressionBuilders 或身后，用code：
You can build and use either your own Custom ExpressionBuilders or Use code behind as:
txtbox.CssClass = TEXTBOX_CSS_CLASS;
检查此链接 在构建自定义前pression建设者。
一旦你建立你的自定义前pression可以显示像值：
Check this link on building Custom Expression builders. Once you build your custom Expression you can display value like:
<asp:TextBox Text="<%$ SetValue:SomeParamName %>"
ID="setting"
runat="server" />
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