c# - 错误 CS0103 : The name ' ' does not exist in the current context

Question

当我的 View 加载时，我需要检查用户正在访问哪个域，并根据结果为页面上显示的 Logo 引用不同的样式表和图像源。

这是我的代码:

@{
    string currentstore=HttpContext.Current.Request.ServerVariables["HTTP_HOST"];

    if (currentstore == "www.mydomain.com")
    {
        <link href="/path/to/my/stylesheets/styles1-print.css" rel="stylesheet" type="text/css" />
        string imgsrc="/content/images/uploaded/store1_logo.jpg";
    }
    else
    {
        <link href="/path/to/my/stylesheets/styles2-print.css" rel="stylesheet" type="text/css" />
        string imgsrc="/content/images/uploaded/store2_logo.gif";
    }
}

然后，再往下一点，我这样调用 imgsrc 变量:

<a href="@Url.RouteUrl("HomePage")" class="logo"><img  alt="" src="@imgsrc"></a>

我收到一条错误消息:

error CS0103: The name 'imgsrc' does not exist in the current context

我想这是因为“imgsrc”变量是在现在关闭的代码块中定义的...？

在页面下方引用此变量的正确方法是什么？

Answer 1

只需将声明移到 if block 之外。

@{
string currentstore=HttpContext.Current.Request.ServerVariables["HTTP_HOST"];
string imgsrc="";
if (currentstore == "www.mydomain.com")
    {
    <link href="/path/to/my/stylesheets/styles1-print.css" rel="stylesheet" type="text/css" />
    imgsrc="/content/images/uploaded/store1_logo.jpg";
    }
else
    {
    <link href="/path/to/my/stylesheets/styles2-print.css" rel="stylesheet" type="text/css" />
    imgsrc="/content/images/uploaded/store2_logo.gif";
    }
}

<a href="@Url.RouteUrl("HomePage")" class="logo"><img  alt="" src="@imgsrc"></a>

你可以让它更干净一些。

@{
string currentstore=HttpContext.Current.Request.ServerVariables["HTTP_HOST"];
string imgsrc="/content/images/uploaded/store2_logo.gif";
if (currentstore == "www.mydomain.com")
    {
    <link href="/path/to/my/stylesheets/styles1-print.css" rel="stylesheet" type="text/css" />
    imgsrc="/content/images/uploaded/store1_logo.jpg";
    }
else
    {
    <link href="/path/to/my/stylesheets/styles2-print.css" rel="stylesheet" type="text/css" />
    }
}