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[英]How to convert result of linq query on two datatable into final datatable in c# winforms
[英]How to append query result to a datatable c#
我需要查詢結果追加到datatable
的方法調用不同的參數各一次。 但現在每次都會覆蓋datatable
的內容而不是追加。
是否有可能追加? 請幫我...
Protected void chkrow_CheckedChanged(object sender, EventArgs e)
{
DataTable dtble = new DataTable();
CheckBox chkrow = (CheckBox)sender;
gridViewRow gvrow = chkrow.Parent.Parent;
GridView gvemp = (GridView) grdemp.Rows[gvrow.RowIndex].Cells[2].FindControl("gvemp");
string emp = grdemp.DataKeys[gvrow.RowIndex].Values[2].ToString();
if(gvemp.Checked == true)
{
string sqls = "select * from emptable where empid= ' " + emp.ToString() + "' " ;
OracleCommand cmd = new OracleCommand(sqls, cn) ;
OracleDataAdapter da = new OracleDataAdapter(cmd) ;
da.Fill(dtble);
//here I need to append result to dtble rather than overwriting when each checkbox is checked
}
}
在函數外部定義變量dtble以使其可全局訪問,在頁面加載時填充它,加載網格視圖然后 -
Protected void chkrow_CheckedChanged(object sender, EventArgs e)
{
DataTable dtble_inner=new DataTable() ;
CheckBox chkrow=(CheckBox)sender;
gridViewRow gvrow=chkrow.Parent.Parent;
GridView gvemp=(GridView) grdemp. Rows[gvrow.RowIndex].Cells[2].FindControl("gvemp");
string emp=grdemp. DataKeys[gvrow.RowIndex].Values[2].ToString();
if(gvemp.Checked==true)
{
string sqls="select * from emptable where empid= ' " + emp. ToString() +"' " ;
OracleCommand cmd=new OracleCommand(sqls, cn) ;
OracleDataAdapter da=new OracleDataAdapter(cmd) ;
da. Fill(dtble_inner);
if(dtble_inner.tables.count > 0 && dtble_inner.tables.rows.count >0)
{
//something like below
dtble.rows.add(dtble_inner.tables.rows(0));
}
// rebind your gridview here with dtble
}
}
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