带有int数组参数的EF ExecuteSqlCommand

尝试使用类型数组int传递参数时遇到问题.到目前为止我做了什么,但两种方法都失败了.

方法1(失败):

int[] CategoryArray;
CategoryArray = new int[userItem.ListItemId.Count()];
int i=0;

foreach (int catID in userItem.ListItemId)
{
    CategoryArray[i] = catID;
    i++;
}

db.Database.ExecuteSqlCommand("delete from SupportRegion where UserId={0} and CategoryID not in ({1})", userItem.UserId, CategoryArray);

方法2(也失败):

db.Database.ExecuteSqlCommand("delete from SupportRegion where UserId={0} and CategoryID not in ({1})", userItem.UserId, String.Join(",", userItem.ListItemId)); 

如何将参数定义为整数数组？

非常感谢