C#学习教程：Unabletoapplytheindexwiththeexpressionoftype"System.Collections.Generic.ICollection"inthemvccontrollerCollections.Generic.ICollection"publicActionResultaddstandardpackage1(ICollectionSingleStay,ICollectionDOUBLESTAY,ICollectionTRIBLESTAY,ICollectionFAMILYSTAY,ICollectionEXTRABED){vars=SingleStay;for(inti=0;i
