Question

我在这里按照这些说明操作：http://w3schools.com/razor/razor_example.asp 注意：我正在使用Web Matrix

示例说要这样做：

@
{
var imagePath; 
if( Request["Choice"] != null)
{imagePath="images\" + Request["Choice"];} 
} 
<!DOCTYPE html> 
<html> 
<body> 
<h1>Display Images</h1> 
<form method="post" action=""> 
<div>
   I want to see: 
   <select name="Choice"> 
      <option value="Photo1.jpg">Photo 1</option> 
      <option value="Photo2.jpg">Photo 2</option> 
      <option value="Photo3.jpg">Photo 3</option> 
   </select> 
   &nbsp; 
   <input type="submit" value="Submit" /> 
</div> 
<div style="padding:10px;"> 
@if(imagePath != "")
{<img src="@imagePath" alt="Sample" />} 
</div> 
</form> 
</body> 
</html>

所有我得到这个错误：

是否必须设置接受@ {在单独的行上？

    Server Error in '/' Application.
    Parser Error 
    Description: An error occurred during the parsing of a resource
    required to service this request. Please review the following 
    specific parse error details and modify your source file appropriately. 

    Parser Error Message: A space or line break was encountered after
    the "@" character.  Only valid identifiers, keywords, comments, 
    "(" and "{" are valid at the start of a code block and they must 
    occur immediately following "@" with no space in between.


    Source Error: 


    Line 1:  @
    Line 2:  {
    Line 3:  var imagePath; 


    Source File: /Page.cshtml    Line: 1 


    Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

如果我把它们放在同一行，我会收到这个错误：

    Parser Error 
    Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

    Parser Error Message: The code block is missing a closing "}" character.  Make sure you have a matching "}" character for all the "{" characters within this block, and that none of the "}" characters are being interpreted as markup.


    Source Error: 


    Line 1:  @{
    Line 2:  var imagePath; 
    Line 3:  if( Request["Choice"] != null)


    Source File: /Page.cshtml    Line: 1

我不知道什么是错的。

Answer 1

有些人只需将jquery.com中的代码示例复制到剃刀文件中就会偶然发现这个问题。例如，我正在测试一些东西，并从一个长的javascript变量值得到一个正则表达式的错误。

 emailRegex = /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/,

注意@@，我必须添加第二个@来逃避....否则我得到上面的错误，因此谷歌搜索显示我在顶部结果中的这个stackoverflow页面。所以虽然这不能直接回答这个问题，但我确信它可以帮助别人。

Answer 2

以下是修复代码中的几个错误的方法：

@{
    var imagePath = ""; 
    if(Request["Choice"] != null) {
        imagePath = "images/" + Request["Choice"];
    } 
} 
<!DOCTYPE html> 
<html> 
<body> 
<h1>Display Images</h1> 
<form method="post" action=""> 
<div>
   I want to see: 
   <select name="Choice"> 
      <option value="Photo1.jpg">Photo 1</option> 
      <option value="Photo2.jpg">Photo 2</option> 
      <option value="Photo3.jpg">Photo 3</option> 
   </select> 
   &nbsp; 
   <input type="submit" value="Submit" /> 
</div> 
<div style="padding:10px;"> 
    @if(imagePath != "") {
        <img src="@imagePath" alt="Sample" />
    } 
</div> 
</form> 
</body> 
</html>

Answer 3

您需要在@ character.change之后删除换行符，就像这样

    @{
    var imagePath;
////other things..

这是一个很好的语法参考http://haacked.com/archive/2011/01/06/razor-syntax-quick-reference.aspx 你也需要改变这些线，

@{if(imagePath != "")

<img src="@imagePath" alt="Sample" />

}

Answer 4

var imagePath;的代码错误如果不指定值，则无法使用var声明只需将其更改为：
var imagePath = "";
或
string imagePath;

当我按照这个例子时，为什么会出现Parser Error？

4 个答案: