怎样构建一个如果一个MVC视图中陈述 [英] How do I construct an if statement within a MVC View

问题描述

希望这个问题是快速，无痛

Hopefully this question is quick and painless

我有，我想这取决于if语句，显示以下两个值中的一个MVC视图。这是我在视图本身：

I have a mvc view where i want to display either one of two values depending on an if statement. This is what I have in the view itself:

 <%if (model.CountryId == model.CountryId) %>
        <%= Html.Encode(model.LocalComment)%> 
        <%= Html.Encode(model.IntComment)%>

如果属实显示model.LocalComment，如有虚假显示model.IntComment。

If true display model.LocalComment, if false display model.IntComment.

我得到这两个值显示这是行不通的。我在做什么错了？

This doesn't work as I get both values showing. What am I doing wrong?

推荐答案

您如果语句总是判断为真。您正在测试是否 model.CountryId 等于 model.CountryId 这始终是正确的：如果（ model.CountryId == model.CountryId）。你也是缺少其他语句。它应该是这样的：

Your if statement always evaluates to true. You are testing whether model.CountryId equals model.CountryId which is always true: if (model.CountryId == model.CountryId). Also you are missing an else statement. It should be like this:

<%if (model.CountryId == 1) { %>
    <%= Html.Encode(model.LocalComment) %> 
<% } else if (model.CountryId == 2) { %>
    <%= Html.Encode(model.IntComment) %>
<% } %>

显然，你需要替换 1 和 2 与正确的价值观。

个人而言，我会写一个HTML帮手这一任务，以避免在视图的标记汤：

Personally I would write an HTML helper for this task to avoid the tag soup in the views:

public static MvcHtmlString Comment(this HtmlHelper<YourModelType> htmlHelper)
{
    var model = htmlHelper.ViewData.Model;
    if (model.CountryId == 1)
    {
        return MvcHtmlString.Create(model.LocalComment);
    } 
    else if (model.CountryId == 2)
    {
        return MvcHtmlString.Create(model.IntComment);
    }
    return MvcHtmlString.Empty;
}

然后在你看来简单：

And then in your view simply:

<%= Html.Comment() %>

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