我使用列表框以字符串的形式查看数据库中的一些记录,但我有两个问题。
ASP代码。
<form runat="server">
<div class="clearfix">
<asp:ListBox runat="server" ID="g1SeasonsListView" CssClass="adminSeasonsListView" OnSelectedIndexChanged="g1SeasonsListView_SelectedIndexChanged" />
<asp:ListBox runat="server" ID="g2SeasonsListView" CssClass="adminSeasonsListView" />
<asp:ListBox runat="server" ID="g3SeasonsListView" CssClass="adminSeasonsListView" />
</div>
<div class="clearfix">
<asp:Button ID="g1DeleteBtn" Text="Delete" runat="server" OnClick="g1DeleteBtn_Click" CssClass="adminDeleteBtn" />
<asp:Button ID="g2DeleteBtn" Text="Delete" runat="server" OnClick="g2DeleteBtn_Click" CssClass="adminDeleteBtn" />
<asp:Button ID="g3DeleteBtn" Text="Delete" runat="server" OnClick="g3DeleteBtn_Click" CssClass="adminDeleteBtn" />
</div>
</form>
CS代码,我在VS2013中通过观察窗口检查过,里面没有什么特别的地方。
protected void g1DeleteBtn_Click(object sender, EventArgs e)
{
}
protected void g2DeleteBtn_Click(object sender, EventArgs e)
{
}
protected void g3DeleteBtn_Click(object sender, EventArgs e)
{
}
protected void g1SeasonsListView_SelectedIndexChanged(object sender, EventArgs e)
{
}
当我想更新列表框时,我使用这段代码。
private void UpdateListeView()
{
List<string> seasonsListTemp = null;
g1SeasonsListView.Items.Clear();
seasonsListTemp = (from s in database.Gs where s.grade == 1 select s.season).ToList();
for (int i = 0; i < seasonsListTemp.Count; i++)
g1SeasonsListView.Items.Add(seasonsListTemp[i]);
g2SeasonsListView.Items.Clear();
seasonsListTemp = (from s in database.Gs where s.grade == 2 select s.season).ToList();
for (int i = 0; i < seasonsListTemp.Count; i++)
g2SeasonsListView.Items.Add(seasonsListTemp[i]);
g3SeasonsListView.Items.Clear();
seasonsListTemp = (from s in database.Gs where s.grade == 3 select s.season).ToList();
for (int i = 0; i < seasonsListTemp.Count; i++)
g3SeasonsListView.Items.Add(seasonsListTemp[i]);
}
我甚至尝试在按下删除按钮时获取所选索引,但结果都是一样的。
绑定你的代码在一个 !Page.IsPostBack
块。这将确保代码不会在postback上执行。如果你在PostBack上绑定了ListView,你将失去GridView的状态,包括被触发的事件,SelectedIndex等。
获取一个值,该值表示页面是第一次渲染还是响应postback而加载。
if(!Page.IsPostBack)
{
UpdateListeView();
}
通常控件是在Page_Load方法中绑定的,你可能需要在那里检查Page.IsPostBack。