如何在请求中显示所有语言?

How to show all languages in a request?

octokit.net

我这样做是为了按语言过滤查询

var request = new SearchRepositoriesRequest("mvc client side framework")
{
   // how about we restrict the language the library is written in?
    Language = Language.JavaScript
}

如何让所有语言重新出现在请求中?
类似于:

Language = Language.All

属性 Language 可以为空,所以也许 Language = null?