Appliquer foreach dans les lignes gridview ne semble pas fonctionner

Question

J'ai un gridview et je convertis des lignes de gridview en datatable ... Mais je ne peux pas obtenir la valeur d'un champ caché dans la cellule [0] dans le gridview. ...

DataTable dt = new DataTable(); 
    dt.Columns.Add(new DataColumn("EmpId", typeof(Int64))); 
    dt.Columns.Add(new DataColumn("FromDate", typeof(DateTime))); 
    dt.Columns.Add(new DataColumn("ToDate", typeof(DateTime))); 
    dt.Columns.Add(new DataColumn("DaysPresent", typeof(decimal))); 
    dt.Columns.Add(new DataColumn("OpeningAdvance", typeof(double))); 
    dt.Columns.Add(new DataColumn("AdvanceDeducted", typeof(double))); 
    dt.Columns.Add(new DataColumn("RemainingAdvance", typeof(double))); 
    dt.Columns.Add(new DataColumn("SalaryGiven", typeof(double))); 
    dt.Columns.Add(new DataColumn("CreatedDate", typeof(DateTime))); 

    foreach (GridViewRow row in gridEmployee.Rows) 
    { 
     DataRow dr = dt.NewRow(); 
     dr["EmpId"] = Convert.ToInt64(row.Cells[0].Text); 
     dr["FromDate"] = Convert.ToDateTime(GetMonthNumberFromAbbreviation(fromdate[1].ToString()) + '/' + fromdate[0].ToString() + '/' + fromdate[2].ToString()); 
     dr["ToDate"] = Convert.ToDateTime(GetMonthNumberFromAbbreviation(todate[1].ToString()) + '/' + todate[0].ToString() + '/' + todate[2].ToString()); 
     dr["DaysPresent"] = Convert.ToDecimal(row.Cells[4].Text); 
     dr["OpeningAdvance"] = Convert.ToDouble(row.Cells[5].Text); 
     dr["AdvanceDeducted"] = Convert.ToDouble(row.Cells[6].Text); 
     dr["RemainingAdvance"] = Convert.ToDouble(row.Cells[7].Text); 
     dr["SalaryGiven"] = Convert.ToDouble(row.Cells[8].Text); 
     dr["CreatedDate"] = Convert.ToDateTime(System.DateTime.Now.ToString()); 
     dt.Rows.Add(dr); 
    } 

Je suis l'erreur dans la ligne,

dr["EmpId"] = Convert.ToInt64(row.Cells[0].Text);

Input String was not in a correct format

note:

Cells[0] est un HiddenField qui contient EMPID ....

<asp:TemplateField > 
    <HeaderStyle Width="1%" /> 
    <HeaderTemplate> 
    </HeaderTemplate> 
    <ItemTemplate> 
    <asp:HiddenField ID="HiddenId" runat="server" value='<%#Eval("Emp_Id") %>' /> 
    <asp:Label ID="LblHiddenId" runat="server" Text='<%#Eval("Emp_Id") %>'></asp:Label> 
    </ItemTemplate> 
    <ItemStyle Width="1%" CssClass="GridCs" HorizontalAlign="Left" /> 
    </asp:TemplateField> 

Mon gridview, alt text http://img109.imageshack.us/img109/6804/gridnewcopy.jpg

Answer 1

Vous devez ajouter une condition pour vous assurer que vous n'êtes pas l'en-tête et l'analyse syntaxique du pied de page:

EDIT: Résultat de travail (en laissant l'autre parce qu'il peut également appliquer à des situations similaires

foreach (GridViewRow row in gridEmployee.Rows) 
{ 
    DataRow dr = dt.NewRow(); 
    dr["EmpId"] = Convert.ToInt64(((Label)cells[0].FindControl("LblHiddenId")).Text); 
    dr["FromDate"] = Convert.ToDateTime(GetMonthNumberFromAbbreviation(fromdate[1].ToString()) + '/' + fromdate[0].ToString() + '/' + fromdate[2].ToString()); 
    dr["ToDate"] = Convert.ToDateTime(GetMonthNumberFromAbbreviation(todate[1].ToString()) + '/' + todate[0].ToString() + '/' + todate[2].ToString()); 
    dr["DaysPresent"] = Convert.ToDecimal(row.Cells[4].Text); 
    dr["OpeningAdvance"] = Convert.ToDouble(row.Cells[5].Text); 
    dr["AdvanceDeducted"] = Convert.ToDouble(row.Cells[6].Text); 
    dr["RemainingAdvance"] = Convert.ToDouble(row.Cells[7].Text); 
    dr["SalaryGiven"] = Convert.ToDouble(row.Cells[8].Text); 
    dr["CreatedDate"] = Convert.ToDateTime(System.DateTime.Now.ToString()); 
    dt.Rows.Add(dr); 
} 

EDIT:. Depuis que je ne suis pas en studio sur ce à me corriger

foreach (GridViewRow row in gridEmployee.Rows) 
{ 
    if(row.RowType == DataControlRowType.DataRow) 
    { 
     DataRow dr = dt.NewRow(); 
     dr["EmpId"] = Convert.ToInt64(row.Cells[0].Text); 
     dr["FromDate"] = Convert.ToDateTime(GetMonthNumberFromAbbreviation(fromdate[1].ToString()) + '/' + fromdate[0].ToString() + '/' + fromdate[2].ToString()); 
     dr["ToDate"] = Convert.ToDateTime(GetMonthNumberFromAbbreviation(todate[1].ToString()) + '/' + todate[0].ToString() + '/' + todate[2].ToString()); 
     dr["DaysPresent"] = Convert.ToDecimal(row.Cells[4].Text); 
     dr["OpeningAdvance"] = Convert.ToDouble(row.Cells[5].Text); 
     dr["AdvanceDeducted"] = Convert.ToDouble(row.Cells[6].Text); 
     dr["RemainingAdvance"] = Convert.ToDouble(row.Cells[7].Text); 
     dr["SalaryGiven"] = Convert.ToDouble(row.Cells[8].Text); 
     dr["CreatedDate"] = Convert.ToDateTime(System.DateTime.Now.ToString()); 
     dt.Rows.Add(dr); 
    } 
} 

Answer 2

Cette erreur signifie que cells[0].Text ne contient pas de numéro.

Vérifiez la valeur de row.Cells[0].Text dans le débogueur.