如果列值之一为空，则在 Gridview 中获取 Label 的默认值答案

【问题标题】：Getting the default value of Label in the Gridview if the one of the column value is null如果列值之一为空，则在 Gridview 中获取 Label 的默认值
【发布时间】：2019-03-15 01:56:42
【问题描述】：

下面是我的网格视图

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" EnableModelValidation="True" onrowdatabound="GridView1_RowDataBound" onrowcommand="GridView1_RowCommand" onrowdeleting="GridView1_RowDeleting"> 
  <asp:TemplateField HeaderText="Amount" HeaderStyle-ForeColor="DimGray" >
<ItemTemplate>
<asp:Label ID="lblamount" runat="server" Text='Label' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Price" HeaderStyle-ForeColor="DimGray" >
<ItemTemplate>
<asp:Label ID="lblprice" runat="server" Text='Label' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>

在 RowData_BoundEvent 中

  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
     if (e.Row.RowType == DataControlRowType.DataRow)
        {
     Label lbl2 = (Label)e.Row.FindControl("lblamount");
      if(amount>0) {lbl2.Text = amount;} else lbl2.Text = string.Empty;

      Label lbl3 = (Label)e.Row.FindControl("lblprice");
            if(price>0) {lbl3.Text = price;} else lbl3.Text = string.Empty;

如果在 Amount 或 Price 中没有输入值，如果金额不大于零，我会尽量不在 gridview 中显示值。但是，如果条件不满足，网格仍将金额显示为标签，价格显示为标签。

【问题讨论】：

标签： asp.net

【解决方案1】：

您应该使用GridViewRow's DataItem 来获取这些值。

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
      // Retrieve the underlying data item. In this example
      // the underlying data item is a DataRowView object. 
      DataRowView rowView = (DataRowView)e.Row.DataItem;

      Double amount = (Double)(rowView["amount"]);
      Double price =  (Double)(rowView["price"]);

      Label lblamount= (Label)e.Row.FindControl("lblamount");
      Label lblprice = (Label)e.Row.FindControl("lblprice");

      lblamount.Text = amount > 0 ? amount.ToString() : String.Empty;
      lblprice.Text  = price  > 0 ? price.ToString()  : String.Empty;
    }
}

【讨论】：