C# 嵌套 if 语句使 Razor 感到困惑
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Nested if statement is confusing Razor
提问by Derek
I'm trying to set up a dropdown menu that pulls from a Datatable. This works just fine for the first level of the menu.
我正在尝试设置一个从数据表中提取的下拉菜单。这适用于菜单的第一级。
Working code:
工作代码：
<ul class="dropdown-menu">
@foreach (System.Data.DataRow dr in menu.Rows)
{
if (Level1 != dr["Level1"].ToString())
{
<li><a href="#">@dr["Level1"].ToString()</a></li>
Level1 = @dr["Level1"].ToString();
}
}
</ul>
The problem occurs when I try to add a nested if statement. If you put this code into Visual Studio you will notice that the closing bracket for the @foreachloop is not recognized by Razor.
当我尝试添加嵌套的 if 语句时会出现问题。如果将此代码放入 Visual Studio，您会注意到@foreachRazor 无法识别循环的右括号。
Code breaks:
代码中断：
<ul class="dropdown-menu">
@foreach (System.Data.DataRow dr in menu.Rows)
{
if (Level1 != dr["Level1"].ToString())
{
<li><a href="#">@dr["Level1"].ToString()</a></li>
Level1 = @dr["Level1"].ToString();
if (Level2 != dr["Level2"].ToString())
{
<li><a href="#">@dr["Level2"].ToString()</a></li>
Level2 = @dr["Level2"].ToString();
}
}
} <!-- the issue is the bracket on this line -->
</ul>
采纳答案by Splendor
You'll need to wrap the offending section in <text>tags. See this answer: https://stackoverflow.com/a/6099659/1451531
您需要将违规部分包装在<text>标签中。看到这个答案：https: //stackoverflow.com/a/6099659/1451531
回答by David Rettenbacher
I don't think you need to write the @in front of @dr[...]in the lines where you assign the value to LevelX
我不认为你需要在你分配值的行@前面写@dr[...]LevelX
<ul class="dropdown-menu">
@foreach (System.Data.DataRow dr in menu.Rows)
{
if (Level1 != dr["Level1"].ToString())
{
<li><a href="#">@dr["Level1"].ToString()</a></li>
Level1 = dr["Level1"].ToString(); // no need here
if (Level2 != dr["Level2"].ToString())
{
<li><a href="#">@dr["Level2"].ToString()</a></li>
Level2 = dr["Level2"].ToString(); // and no need here
}
}
} <!-- the issue is the bracket on this line -->
</ul>
EDIT
编辑
To address the question, why the closing bracket is not recognized.
为了解决这个问题，为什么不能识别右括号。
TL;DR
As you are again in code-region you do not need the @-sign.
TL;DR
当您再次处于代码区域时，您不需要@-sign。
Details
The <li>...</li>section defines a html-region, where text is interpreted as html.
Directly after the closing </li>the outer code-region is active againand text is interpreted as C#-code. Therefore an assignment to Level1is possible. Adding an @-sign to drherehas the same consequences as in an "normal" cs-file:
It's a syntax-error.
详细信息
该<li>...</li>部分定义了html-region，其中文本被解释为html。
后直接封闭</li>的外码-region是再次活性和文本被解释为C＃-code。因此可以赋值给Level1。在此处添加 -@符号与dr在“正常”cs 文件中具有相同的结果：
这是一个语法错误。
回答by Brett Donald
As per this answer, if a line is being interpreted as markup instead of code, put @ in front of it. If a line is being interpreted as code instead of markup, put @: in front of it.
根据这个答案，如果一行被解释为标记而不是代码，请将 @ 放在它前面。如果一行被解释为代码而不是标记，请将 @: 放在它前面。
