ASP.NET MVC：利用ASP.NET MVC4的IBundleTransform集成LESS

背景

LESS确实不错，只是每次写完LESS都要手工编译一下有点麻烦（VS插件一直没有安装好），昨天在官方看到了如何用IBundleTransform集成LESS，今天就记录一下。

参考资料：http://www.asp.net/mvc/tutorials/mvc-4/bundling-and-minification。

代码

LessTransform

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using System.Web.Optimization;

namespace LessStudy.Infrastructure
{
    public class LessTransform : IBundleTransform
    {
        public void Process(BundleContext context, BundleResponse response)
        {
            response.Content = dotless.Core.Less.Parse(response.Content);
            response.ContentType = "text/css";
        }
    }
}

BundleConfig中增加如下代码

            var lessBundle = new Bundle("~/Content/less").IncludeDirectory("~/Content/less", "*.less");
            lessBundle.Transforms.Add(new LessTransform());
            lessBundle.Transforms.Add(new CssMinify());
            bundles.Add(lessBundle);

在模板中引用

    @Styles.Render("~/Content/less")

顺便说一下LESS的编码

写注释和统一的格式化

/*栅格的左边距*/
@span_margin: 20px;
/*栅格的的宽度*/
@span_width: 60px;
/*栅格数量*/
@span_length: 12;
/*像素单位*/
@px_unit: 1px;

/*固定栅格系统*/
.row
{
    margin-left: -@span_margin;/*抵消第一个栅格的左边距*/
    *zoom: 1;
}

[class*="span"]
{
    float: left;
    min-height:1px;
    margin-left: @span_margin;
}

.span (@index) when (@index > 0) 
{
    .span@{index}
    {
        width: (@index * @span_width + (@index - 1) * @span_margin) * @px_unit;
    }

    .span(@index - 1);
}

.span (0) {}

.span (@span_length);

.offset (@index) when (@index > 0) 
{
    .offset@{index}
    {
        margin-left: (@index * @span_width + (@index + 1) * @span_margin) * @px_unit;
    }

    .offset(@index - 1);
}

.offset (0) {}

.offset (@span_length);




/*自动栅格系统*/

/*栅格的宽度和左边距之比*/
@span_width_margin_scale: 3;
/*栅格的左边距比例*/
@span_margin_percentage: (1 / (@span_length * (@span_width_margin_scale + 1) - 1));

.row-fluid
{
    width: 100%;
    *zoom: 1;
}

.row-fluid [class*="span"]:first-child
{
    margin-left: 0;
}

.row-fluid [class*="span"]
{
    display: block;
    float: left;
    min-height: 30px;
    margin-left: percentage(@span_margin_percentage);
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.fluid_span (@index) when (@index > 0)
{
    .row-fluid .span@{index}
    {
        width: percentage((@index * (@span_width_margin_scale + 1) - 1) * @span_margin_percentage);
    }

    .fluid_span(@index - 1);
}

.fluid_span (0) {}

.fluid_span (@span_length);

.fluid_offset (@index) when (@index > 0)
{
    .row-fluid .offset@{index}
    {
        margin-left: percentage((@index * (@span_width_margin_scale + 1) + 1) * @span_margin_percentage);
    }

    .fluid_offset(@index - 1);
}

.fluid_offset (0) {}

.fluid_offset (@span_length);

如何利用CSS的智能提示呢？

添加文件的时候选择css，然后修改后缀名为less就行了。

备注

学习HTML+CSS有一周了，今天做个网站试试。