/// <summary>
/// 修改用户自定义积分字段的值
/// </summary>
/// <param name="uid">用户id</param>
/// <param name="extid">扩展字段序号(1-8)</param>
/// <param name="pos">增加的数值(可以是负数)</param>
/// <returns>执行是否成功</returns>
public static void UpdateUserExtCredits(int uid, int extid, float pos)
{
DatabaseProvider.GetInstance().UpdateUserExtCredits(uid, extid, pos);
if (appDBCache)
IUserService.UpdateUserExtCredits(uid, extid, pos);
}