问题描述

我正在尝试将流行的 asp.net MVC 2.0 solr.net 示例应用程序代码转换为 Razor 语法.我无法理解最后一行...请帮助

I am trying to convert the popular asp.net MVC 2.0 solr.net sample app code to Razor syntax. I am not able to understand the last line ... Kindly help

 <% Html.Repeat(new[] { 5, 10, 20 }, ps => { %>
            <% if (ps == Model.Search.PageSize) { %>
            <span><%= ps%></span>
            <% } else { %>
            <a href="@Url.SetParameters(new {pagesize = ps, page = 1})">@ps</a>
            <% } %>
  <% }, () => { %> | <% }); %>

[更新]Html.Repeat 扩展的来源

HtmlHelperRepeatExtensions.cs

推荐答案

为此，您必须修改 Html.Repeat 扩展方法以利用 模板化 Razor 代表，如 Phil Haack 所示.然后:

For this to work you will have to modify the Html.Repeat extension method to take advantage of Templated Razor Delegates as illustrated by Phil Haack. And then:

@{Html.Repeat(
    new[] { 5, 10, 20 }, 
    @<text>
        @if (item == Model.Search.PageSize)
        {
            <span>@item</span>
        }
        else
        {
            <a href="@Url.SetParameters(new { pagesize = item, page = 1 })">
                @item
            </a>
        }
    </text>,
    @<text>|</text>
);}

<小时>

更新:

根据您更新的问题，您似乎正在使用自定义 HTML 帮助程序，但正如我在回答中所述，您需要更新此帮助程序以使用 Templated Razor Delegates 语法，如果您希望它工作.例如，它的外观如下:

According to your updated question you seem to be using a custom HTML helper but as I stated in my answer you need to updated this helper to use the Templated Razor Delegates syntax if you want it to work. Here's for example how it might look:

public static class HtmlHelperRepeatExtensions
{
    public static void Repeat<T>(
        this HtmlHelper html,
        IEnumerable<T> items,
        Func<T, HelperResult> render,
        Func<dynamic, HelperResult> separator
    )
    {
        bool first = true;
        foreach (var item in items)
        {
            if (first)
            {
                first = false;
            }
            else
            {
                separator(item).WriteTo(html.ViewContext.Writer);
            }

            render(item).WriteTo(html.ViewContext.Writer);
        }
    }
}

或者如果你想让辅助方法直接返回一个 HelperResult 这样你在调用它时就不需要使用括号:

or if you want to have the helper method directly return a HelperResult so that you don't need to use the brackets when calling it:

public static class HtmlHelperRepeatExtensions
{
    public static HelperResult Repeat<T>(
        this HtmlHelper html,
        IEnumerable<T> items,
        Func<T, HelperResult> render,
        Func<dynamic, HelperResult> separator
    )
    {
        return new HelperResult(writer =>
        {
            bool first = true;
            foreach (var item in items)
            {
                if (first)
                    first = false;
                else
                    separator(item).WriteTo(writer);
                render(item).WriteTo(writer);
            }
        });
    }
}

然后在你的视野中:

@Html.Repeat(
    new[] { 5, 10, 20 }, 
    @<text>
        @if (item == Model.Search.PageSize)
        {
            <span>@item</span>
        }
        else
        {
            <a href="@Url.SetParameters(new { pagesize = item, page = 1 })">
                @item
            </a>
        }
    </text>,
    @<text>|</text>
)

这篇关于从 MVC 2.0 代码转换为 razor 语法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！