c# - 当 BoundField 为零时禁用 ButtonField

Question

我有这个 GridView，它填充了 Page_Load:

protected void Page_Load(object sender, EventArgs e) {
  if (!Page.IsPostBack) {
    GridView1.DataSource = actBO.BuscarActividades();
    GridView1.DataBind();
  }
}

---

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" >
        <Columns>
            <asp:BoundField DataField="Id" HeaderText="ID" Visible="False" />
            <asp:BoundField DataField="Class" HeaderText="Class" /> 
            <asp:BoundField DataField="Day" HeaderText="Day" />
            <asp:BoundField DataField="Time" HeaderText="Time" />
            <asp:BoundField DataField="Vacants" HeaderText="Vacants" />          

            <asp:ButtonField ButtonType="Button" HeaderText="Book" Text="Book"/>

        </Columns>
 </asp:GridView>

其中“Vacants”列显示一个 int(它表示一个类(class)中的空置预订空间数量)。

每一行都有一个用于预订特定类(class)的按钮。我需要为“空缺”字段何时为零设置条件，以便禁用“预订”按钮。

到目前为止，它是这样的:image .

如您所见，我需要在没有更多空缺时禁用该按钮。它应该无法被点击。

Answer 1

为此，您必须注册 OnRowDataBound 事件。更多解释可以在here中找到.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
        <Columns>
            <asp:BoundField DataField="Id" HeaderText="ID" Visible="False" />
            <asp:BoundField DataField="Class" HeaderText="Class" /> 
            <asp:BoundField DataField="Day" HeaderText="Day" />
            <asp:BoundField DataField="Time" HeaderText="Time" />
            <asp:BoundField DataField="Vacants" HeaderText="Vacants" />          
            <asp:ButtonField ButtonType="Button" HeaderText="Book" Text="Book"/>
        </Columns>
 </asp:GridView>


protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // get your button via the column index; ideally you could use template field and put your own button inside
        var button = e.Row.Cell[5].Controls[0] as Button;
        int vacant = 0;
        var vacantVal = int.TryParse(e.Row.Cell[4].Text, out vacant);
        if (button != null)
        {
            button.Enabled = vacant > 0;
        }
    }
}

希望对您有所帮助。