这是我的 Datagridview Paging 代码，为什么我Child list for field Questions cannot be created.在这行代码中没有处理这个 ArgumentException this.dataGridView1.DataSource = GetCurrentRecords(1, con);。我哪里错了
public partial class ShowEngClgList : Form
{
OleDbConnection con = null;
private OleDbCommand cmd1;
private OleDbCommand cmd2;
private OleDbDataAdapter adp1 = null;
DataSet ds;
private int PageSize = 10;
private int CurrentPageIndex = 1;
private int TotalPage = 0;
public ShowEngClgList()
{
InitializeComponent();
try
{
con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db1.mdb");
con.Open();
}
catch (Exception err)
{
}
cmd1 = new OleDbCommand("Select * from Questions order by QID", con);
ds = new DataSet();
adp1 = new OleDbDataAdapter(cmd1);
adp1.Fill(ds, "Questions");
dataGridView1.DataSource = ds;
dataGridView1.DataMember = "Questions";
// WORK IN PAGING FOR DATAGRIDVIEW
// Get total count of the pages;
this.CalculateTotalPages();
this.dataGridView1.ReadOnly = true;
// Load the first page of data;
this.dataGridView1.DataSource = GetCurrentRecords(1, con);//Getting exception at this line
}
private void ShowEngClgList_Load(object sender, EventArgs e)
{
}
private void CalculateTotalPages()
{
int rowCount = ds.Tables["Questions"].Rows.Count;
this.TotalPage = rowCount / PageSize;
if (rowCount % PageSize > 0) // if remainder is more than zero
{
this.TotalPage += 1;
}
}
private DataTable GetCurrentRecords(int page, OleDbConnection con)
{
DataTable dt = new DataTable();
if (page == 1)
{
cmd2 = new OleDbCommand("Select TOP " + PageSize + " * from Questions ORDER BY QID", con);
}
else
{
int PreviouspageLimit = (page - 1) * PageSize;
cmd2 = new OleDbCommand("Select TOP " + PageSize +
" * from Questions " +
"WHERE QID NOT IN " +
"(Select TOP " + PreviouspageLimit + " QID from Questions ORDER BY QID) ", con); // +
//"order by customerid", con);
}
try
{
// con.Open();
this.adp1.SelectCommand = cmd2;
this.adp1.Fill(dt);
}
finally
{
con.Close();
}
return dt;
}
}
提前感谢您的帮助。