问一个Application的问题
private int getAdsCount(int position) { int count = 0; if (Application["pos_" + position] == null) // 总是提示此行未将对象引用设置到对象。 { SqlParameter[] param = { new SqlParameter("@ChannelID",SqlDbType.Int,4), new SqlParameter("@AreaID",SqlDbType.Int,8), new SqlParameter("@CategoryID",SqlDbType.Int,8), new SqlParameter("@CategoryB",SqlDbType.Int,8), new SqlParameter("@PositionID",SqlDbType.BigInt,8) }; param[0].Value = 4; param[1].Value = AreaID; param[2].Value = CategoryID; param[3].Value = CategoryB; param[4].Value = position; DataSet ds = PubPage.Common.SqlHelper_V1.ExecuteDataset(conn, CommandType.StoredProcedure, "sp_GetAdList", param); count = ds.Tables[0].Rows.Count; Application.Lock(); Application["pos_" + position] = count; Application.UnLock(); } else { count = Convert.ToInt32(Application["pos_" + position].ToString()); } return count; }