標題文本變爲零

Question

我使用下面的代碼來獲得DataField="Quantity"在GridView的總和，並顯示在GridView頁腳

的問題HeaderText="Quantity"變爲零

結果

protected void griddelverynote_RowDataBound(object sender, GridViewRowEventArgs e) 
{ 
    int TotalQuantity = 0; 
    if (e.Row.RowType == DataControlRowType.DataRow) 
    TotalQuantity += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Quantity")); 
    else if (e.Row.RowType == DataControlRowType.Footer) 
    e.Row.Cells[1].Text = "Total Quantity"; 
    e.Row.Cells[2].Text = TotalQuantity.ToString(); 
} 

Answer 1

你的代碼中的probelm是RowDataBound當它綁定時觸發每一行的事件。因此，每行TotalQuantity正在重新初始化爲0。聲明外部變量TotalQuantity： -

int TotalQuantity = 0; 
protected void griddelverynote_RowDataBound(object sender, GridViewRowEventArgs e) 
{ 
    if (e.Row.RowType == DataControlRowType.DataRow) 
      TotalQuantity += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Quantity")); 
    else if (e.Row.RowType == DataControlRowType.Footer) 
    { 
      e.Row.Cells[1].Text = "Total Quantity"; 
      e.Row.Cells[2].Text = TotalQuantity.ToString(); 
    } 
}