how to create an else if statement in Razor?

问题:

I am trying to display some rows in a table. Depending on the UserGroup, the View should show different markup. An administrator can delete rows, but a moderator can only mark them as visible or invisible.

How do i write a proper if else statement in Razor?

The page is displayed correctly, but the page title is Parse Error

This is my code:

@model MvcApplication3.Models.ViewModels.New.Question.MatrixRows

@{
    bool visible = Model.Visible;
}

<tr>
    <td>
    @if(visible) 
        {
        @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1 })
        }
    @if (!visible)
        {
        @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1, disabled = "disabled" })
        }
    </td>
    <td>
    @if(visible) 
        {
            @Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45 })
        }
    @if (!visible)
    {
        @Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45, disabled = "disabled" })
    }
    </td>
    <td>
        @if (HttpContext.Current.User.IsInRole("Administrator"))
        {
            @Html.HiddenFor(x => x.Delete, new { @class = "mark-for-delete" })
            @Html.LinkToRemoveNestedForm("Slet", "tr", "input.mark-for-delete")    
        }
        @if (HttpContext.Current.User.IsInRole("Moderator"))
        {
            @Html.HiddenFor(x => x.Visible, new { @class = "mark-for-visible" })
            @Html.LinkToDisableNestedForm("Deaktiver", "tr", "input.mark-for-visible")    
        }
        @Html.HiddenFor(id => Model.Row_Id)
    </td>
</tr>

回答1:

The title has parse error because you did not set a title:

@{
    ViewBag.Title = "Home Page";
}

now for an else statement, don't use back the @ syntax:

@if(visible) 
{
    Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45 })
}
else
{
    Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45, disabled = "disabled" })
}

You are checking for a boolean, you just need an else. Also for else if, it works the same.

Your code could be simplified even more by just doing:

@Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45, disabled = visible ? "" : "disabled" })

Because you are displaying the same code anyways, just changing the attribute based on a value. To me, this becomes more readable.

回答2:

as the question is for else if in razor, i used this for SEO purpose

in view

@{
    if (ViewBag.Option == "Mobiles")
{
    ViewBag.Title = "Mobiles";
    ViewBag.Description = "Mobiles";
    ViewBag.Keywords = "Mobiles";

}

   else if (ViewBag.Option == "holiday")
{
    ViewBag.Title = "holiday";
    ViewBag.Description = "holiday.";
    ViewBag.Keywords = "holiday";
}


else
    {
        ViewBag.Title = "home";
        ViewBag.Description = "home";
        ViewBag.Keywords = "home";
    }

}

hope helps someone.

回答3:

You just use else without prepending an @. However, I don't think that is the problem with your page title. Perhaps you need to set the ViewBag.Title property? Your layout page may be depending on it being set.

@if(visible) 
    {
    @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1 })
    }
else
    {
    @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1, disabled = "disabled" })
    }

Title issue:

@{
    bool visible = Model.Visible;
    ViewBag.Title = "My Title;
}