VB.NET中的Razor视图引擎怪癖

我想说Vb.net中需要它的原因是Vb允许xml元素内联,而c不允许。

Dim xmlMarkup = <someElement>Values</span>

因此,vb的自然解析器的行为必须与c不同,因此必须告诉解析器使用 @ . 你可以用 @ 和 @: .

正如前面在注释中提到的,但没有显式显示;在文本标记前面加上@可以解决问题:

@For Each genreName As String In Model.Genres
    @<text>
        <li>@genreName</li>
    </text>
Next

我刚刚在一个VBHTML视图中的ASP.netmvc3rc中尝试了这个方法,它似乎工作得很好:

<ul>
@For Each i As Integer In Enumerable.Range(0, 5)
    @:<li>@i</li>
Next
</ul>

它呈现此标记:

<ul>
    <li>0</li>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
</ul>

这不使用与OP相同的代码,但我将一些C代码从MVC书籍转换为VB.NET,并被绑定在混合内联HTML和VB代码中。这是原来的C#:

@using (Html.BeginForm()) {
    @Html.ValidationSummary()
        <p>Your name: @Html.TextBoxFor(x => x.Name, new { @class = "form-control" }) </p>
        <p>Your email: @Html.TextBoxFor(x => x.Email, new { @class = "form-control" }) </p>
        <p>Your phone: @Html.TextBoxFor(x => x.Phone, new { @class = "form-control" }) </p>
        <p>Will you attend?
        @Html.DropDownListFor(x => x.WillAttend, new[] {
                new SelectListItem() {Text = "Yes, I'll be there",
                    Value = bool.TrueString},
                new SelectListItem() {Text = "No, I can't come",
                    Value = bool.FalseString}
            }, "Choose an option", new { @class = "form-control" })
        </p>
}

这些是用VB表示它的不同方法:

@Using Html.BeginForm()
    @:<p>Your name: @Html.TextBoxFor(Function(x) x.Name)</p>
    @:<p>Your email: @Html.TextBoxFor(Function(x) x.Email)</p>
    @:<p>Your phone: @Html.TextBoxFor(Function(x) x.Phone)</p>
    @:<p>Will you attend?
    @Html.DropDownListFor(Function(x) x.WillAttend, New SelectListItem() {New SelectListItem() With {.Text = "Yes", .Value = Boolean.TrueString}, New SelectListItem() With {.Text = "No", .Value = Boolean.FalseString}})
    @:</p>
End Using

@Using Html.BeginForm()
    @<text>
        <p>Your name: @Html.TextBoxFor(Function(x) x.Name)</p>
        <p>Your email: @Html.TextBoxFor(Function(x) x.Email)</p>
        <p>Your phone: @Html.TextBoxFor(Function(x) x.Phone)</p>
        <p>Will you attend?
        @Html.DropDownListFor(Function(x) x.WillAttend, New SelectListItem() {New SelectListItem() With {.Text = "Yes", .Value = Boolean.TrueString}, New SelectListItem() With {.Text = "No", .Value = Boolean.FalseString}})
        </p>
    </text>
End Using

@code
    Using Html.BeginForm()
        @:<p>Your name: @Html.TextBoxFor(Function(x) x.Name)</p>
        @:<p>Your email: @Html.TextBoxFor(Function(x) x.Email)</p>
        @:<p>Your phone: @Html.TextBoxFor(Function(x) x.Phone)</p>
        @:<p>Will you attend?
        @Html.DropDownListFor(Function(x) x.WillAttend, New SelectListItem() {New SelectListItem() With {.Text = "Yes", .Value = Boolean.TrueString}, New SelectListItem() With {.Text = "No", .Value = Boolean.FalseString}})
        @:</p>
    End Using
End Code

@code    
    Using Html.BeginForm()
        @<text>
            <p>Your name: @Html.TextBoxFor(Function(x) x.Name)</p>
            <p>Your email: @Html.TextBoxFor(Function(x) x.Email)</p>
            <p>Your phone: @Html.TextBoxFor(Function(x) x.Phone)</p>
            <p>Will you attend?
            @Html.DropDownListFor(Function(x) x.WillAttend, New SelectListItem() {New SelectListItem() With {.Text = "Yes", .Value = Boolean.TrueString}, New SelectListItem() With {.Text = "No", .Value = Boolean.FalseString}})
            </p>
        </text>
    End Using
End Code

从这里可以明显看出,当需要在代码块中包含内联HTML时,需要在每一行前面加上 @: 或者用 @<text></text> 封锁。很明显,当您使用 @Code ... End Code 而不是用 @ .

p、 注意 @<text></文本> 标记不会输出到页面,因此不会干扰任何内容

更新:

您可以使用@li@genreName/li而不使用:因为您的HTML标记是自动关闭的,如果不是,那么您将需要使用@:但是您不需要,这在Gabe提供的链接中得到了澄清。也, @<text> 也会有用的!我不想让人们认为他们需要一直使用@:因为他们不需要,如果是这样的话,我会告诉Andrew nurse关于这个核心的:) 结束更新

下面是vb razor的基本语法,

@字符开始内联表达式、单语句块和多语句块:

?
<!-- Single statement blocks  -->

@Code  Dim total = 7  End Code

@Code  Dim myMessage = "Hello World" End Code

 
<!-- Inline expressions -->
<p>The value of your account is: @total </p>

<p>The value of myMessage is: @myMessage</p>

        
     
<!-- Multi-statement block -->

@Code

    Dim greeting = "Welcome to our site!"

    Dim weekDay = DateTime.Now.DayOfWeek

    Dim greetingMessage = greeting & " Today is: " & weekDay.ToString()

End Code

<p>The greeting is: @greetingMessage</p>

所以它应该可以工作,只需在每一行的末尾关闭代码模式,然后用HTML返回,这样就可以避免使用@:-hunt to ellon,我想他是在试图不必使用@: