dataset里面的问题
弱弱的问下

C# code

                string mysql = "select * from carinfo";                m_dataadapter = new SqlDataAdapter(mysql, m_connection);                m_dataadapter.FillSchema(m_ds, SchemaType.Source, "carinfo");                m_dataadapter.Fill(m_ds, "carinfo");                mysql = "select * from cardinfo";                m_dataadapter2 = new SqlDataAdapter(mysql, m_connection);                m_dataadapter2.FillSchema(m_ds, SchemaType.Source, "cardinfo");                m_dataadapter2.Fill(m_ds, "cardinfo");                mysql = "select * from userinfo";                m_dataadapter3 = new SqlDataAdapter(mysql, m_connection);                m_dataadapter3.FillSchema(m_ds, SchemaType.Source, "userinfo");                m_dataadapter3.Fill(m_ds, "userinfo");

userinfo.userID 与 cardinfo.userID ,cardinfo.ID与 carinfo.ID 可以关联
因为需要现在想把已经在dataset中的3个表再组合下成为一张表 放在dataset里行不行

[解决办法]

C# code

string mysql="select * from cardinfo inner join carinfo on cardinfo.ID=carinfo.ID inner join userinfo on cardinfo.userID=userinfo.userID";m_dataadapter = new SqlDataAdapter(mysql, m_connection);m_dataadapter.FillSchema(m_ds, SchemaType.Source, "carinfo");m_dataadapter.Fill(m_ds, "carinfo");
[解决办法]
建议用 DataSetHelper ，里面支持对DataTable的 join,group ..
[解决办法]
自己在DataSet中新增加一张表，然后通过Ado.net表达式实现，这样不需要管理数据同步，应该是比较好的一种解决方式，
http://www.microsoft.com/china/MSDN/library/data/dataAccess/ADONETEXP.mspx