C# 您正在导入一个以.less结尾的文件，但找不到该文件

我试图在运行时将

.less

文件编译成css。但是

dotless

库找不到

@import file.less

文件

我的所有文件都与主less文件位于同一目录中

这是我的C#代码：

我尝试转换的主less文件：

@import "font-awesome.less";
@fa-font-path: "/fonts";

@sco_green: #63b02e;
@sco_orange: #f18500;

@blue-deep:#00a2d1;

@white: #ffffff;
@active: #ffcb8b;
@gray: #999;
@gray-dark: #525252;
@gray-middle: #b8bcba;
@gray-light: #dbdbdb;
@gray-lighter: #efefef;
@gray-super-light: #f7f7f7;
@gray20:#333;
@gray94:#F0F0F0;

Web配置：

<configSections>
    <section name="dotless" type="dotless.Core.configuration.DotlessConfigurationSectionHandler, dotless.Core" />
</configSections>

<system.web>
    <httpHandlers>
        <add path="*.less" verb="GET" type="dotless.Core.LessCssHttpHandler, dotless.Core" />
    </httpHandlers>
</system.web>
<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
        <add name="dotless" path="*.less" verb="GET" type="dotless.Core.LessCssHttpHandler,dotless.Core" resourceType="File" preCondition="" />
    </handlers>

</system.webServer>
<dotless minifyCss="true" cache="true" web="false" disableParameters="true" />

我怎样才能让它工作呢？
在浏览了谷歌上几乎所有的搜索结果后，我发现

基本上，我需要为
dotless
设置当前工作目录，以便能够找到@import文件：

所以我在C#所要做的就是：

显示真实代码，否则很难猜测。我添加了.less文件内容。我还应该提供什么代码？
<configSections>
    <section name="dotless" type="dotless.Core.configuration.DotlessConfigurationSectionHandler, dotless.Core" />
</configSections>

<system.web>
    <httpHandlers>
        <add path="*.less" verb="GET" type="dotless.Core.LessCssHttpHandler, dotless.Core" />
    </httpHandlers>
</system.web>
<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
        <add name="dotless" path="*.less" verb="GET" type="dotless.Core.LessCssHttpHandler,dotless.Core" resourceType="File" preCondition="" />
    </handlers>

</system.webServer>
<dotless minifyCss="true" cache="true" web="false" disableParameters="true" />

    string filePath = $"{_filePath}\\main.less";
    string less = ReadFile(filePath);
    var dotlessConfig = new dotless.Core.configuration.DotlessConfiguration();
    Directory.SetCurrentDirectory(_filePath);
    string css = Less.Parse(less,dotlessConfig);