IDataReader.Read()返回bool，如果读取了一行，则为true.

您需要获取该行中第一个字段的值.这是执行此操作的一种方法:

IDataReader.Read() returns a bool which is true if a row was read.

You need to get the value of the first field in that row. Here is one way to do that:

int maxId = dr2.GetInt32( 0 );

尼克

Nick