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View Details用DataReader读取数据怎样判断当前记录的某列是否为空 ： //调用： if (ReaderExists(dr, "Log_ID")) model.Log_DoctorID = GetInt(dr["Log_ID"]); /// <summary> /// 判断 DataReader 里面是否包含指定的列 /// </summary> /// <param name="dr"></param> /// <param name="columnName"></param> /// <returns></returns> public static bool ReaderExists(DbDataReader dr, string columnName) { int count = dr.FieldCount; for (int i = 0; i < count; i++) { if (dr.GetName(i).Equals(columnName)) { return true; } } return false; } /// <summary> /// 判断 DataReader 里面是否包含指定的列 /// </summary> /// <param name="dr"></param> /// <param name="columnName"></param> /// <returns></returns> public static bool ReaderExists2(DbDataReader dr, string columnName) { dr.GetSchemaTable().DefaultView.RowFilter = "ColumnName= '" + columnName + "'"; return […]
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TF又叫Micro SD卡, 比SD卡小很多, 加一个适配器就可以当SD卡用了. SD卡不可以当TF卡用的。 from:<a href="http://zhidao.baidu.com/link?url=M2xjLHXy8_uS3SkzDSWIJ-1cCEjWO72JtWSU4WrgEN3fU7SAluf0_DMf2nnilGTjbYvEhcCSFfflYRYAddLuoq">http://zhidao.baidu.com/link?url=M2xjLHXy8_uS3SkzDSWIJ-1cCEjWO72JtWSU4WrgEN3fU7SAluf0_DMf2nnilGTjbYvEhcCSFfflYRYAddLuoq</a> |