金蝶LINQ的GroupBy按照多个字段分组

using JN.BOS.Core;

var groups = F_JNXM_CFMetalsEntry.GroupBy(o => new DataEntityGroupKey(new string[] { "F_JNXM_SubordinateCabinet_M", "F_JNXM_Space_M", "F_JNXM_Materials_M", "F_JNXM_MaterialCategory_M" }, this.View.BusinessInfo).GetKey(o));