你可以写代码查询：

from m in Application.Methods
where m.IsExtensionMethod
select m

对于扩展组方法sby类型扩展的代码查询，请参阅：
获取类型列表受cqlinq中的扩展方法影响

For a code query that group extension method sby types extended see: Getting list of types that are effected by an extension method in cqlinq