c# - gridview 中的标题文本更改为零

Question

我正在使用下面的代码在 GridView 中获取 DataField="Quantity" 的总和，并在 GridView 页脚中显示结果

问题是 HeaderText="Quantity" 更改为零

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

您的代码中的问题是 RowDataBound 事件在绑定(bind)时为每一行触发。因此，对于每一行，TotalQuantity 都被重新初始化为 0。在外部声明变量 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();
     }
}