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The parameters dictionary contains a null entry for parameter 'groupid' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult GroupDetail(Int32, Int32, Int32)' in 'CFPA.ShanXingZhe.WebClient.Controllers.GroupController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. 参数名: parameters