这是一个按钮触发后的指令。调试的时候发现的问题，本来想生成一个矩阵的。为什么运行到fill那就突然返回了？
还有就是最后四行什么用，是不是对生成的矩阵重新构成一个新的矩阵？最后两行的0和1代表什么意思？
请不吝赐教,谢谢
if (radioButton2.Checked)
                {   Int32 selectedRowCount = checkedListBox1.SelectedItems.Count;
                    string fields = "";
                    if (selectedRowCount > 0)
                    {
                        for (int b = 0; b < checkedListBox1.CheckedItems.Count; b++)
                        {
                            fields += "," + ee[b];
                        }
                        fields = fields.Substring(1);
                    }
                    ArrayList myarraylist = new ArrayList();
                    string conStr = "user id=system;password=manager;data source=oradb";
                    OracleConnection con = new OracleConnection(conStr);
                    con.Open();
                    DataSet myset1 = new DataSet();
                    DataTable mytable1 = new DataTable();
                    string pici1_select = "select " + fields + " from HISTORY." + biao + " where sampleTime>=20 and sampleTime<=60";
                    OracleDataAdapter myadapter1 = new OracleDataAdapter(pici1_select, con);
                    myadapter1.Fill(myset1, "database");//到这就截止了，下面的程序还没执行就自动返回了，这行程序貌似也没执行成功，因为断点运行时箭头直接没指到下一行就返回了。
                    double[,] data1 = new double[myset1.Tables[0].Rows.Count, myset1.Tables[0].Columns.Count];
                    for (int a = 0; a < myset1.Tables[0].Rows.Count; a++)
                        for (int b = 0; b < myset1.Tables[0].Columns.Count; b++)
                        {
                            data1[a, b] = Convert.ToDouble(myset1.Tables[0].Rows[a][b]);

                        }
                    string jjstr1 = tonewstrings(data1);
                    myarraylist.Add(jjstr1);
                    myarraylist.Add(data1.GetLength(0));
                    myarraylist.Add(data1.GetLength(1));

database你数据库表叫这名字？

再附上一个我运行正确的一段相似程序作参考，这段指令可以完全执行，fill填充那没有出现问题
if (selectedRowCount > 0)
                {
                    for (int b = 0; b < checkedListBox1.CheckedItems.Count; b++)
                    {
                        fields += "," + ee[b];
                    }
                    fields = fields.Substring(1);
                    string conStr = "user id=system;password=manager;data source=oradb";
                    OracleConnection con = new OracleConnection(conStr);
                    con.Open();
                    DataSet myset = new DataSet();
                    DataTable mytable = new DataTable();

                    string selectstr = "select " + fields + " from HISTORY." + biao;     
                    OracleDataAdapter myadapter = new OracleDataAdapter(selectstr, con);
                    myadapter.Fill(myset, "database");
                    double[,] data = new double[dataGridView1.SelectedRows.Count, myset.Tables[0].Columns.Count];
                    for (int a = 0; a < dataGridView1.SelectedRows.Count; a++)
                        for (int b = 0; b < myset.Tables[0].Columns.Count; b++)
                        {
                            data[a, b] = Convert.ToDouble(myset.Tables[0].Rows[dataGridView1.SelectedRows[a].Index][b]);
                        }

select " + fields + " from HISTORY." + biao + " where sampleTime>=20 and sampleTime<=60
这句到SQL里执行下看看有没有数据

根据你前后两次的说法判断，好像" where sampleTime>=20 and sampleTime<=60";这里有问题。

我个人建议你使用try...  catch(exception ex)的方法，把exception的提示信息显示出来，这样会帮助你分析哪里出现了问题！！