我使用列表框以字符串形式查看数据库的某些记录,但是有两个问题:
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>
我通过VS2013的监视窗口检查的CS代码;没有什么特别的:
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)
{
}
并且当我想更新列表框时,我使用此代码:
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]);
}
当我按下删除按钮时,我甚至试图获取选定的索引,但是结果是相同的。
将代码绑定在!Page.IsPostBack
块中。这样可以确保代码不会在回发时执行。如果在PostBack上绑定ListView,则将松开GridView的状态,其中包括正在触发的事件,SelectedIndex等。
!Page.IsPostBack
获取一个值,该值指示是否正在为该页面呈现页面。 第一次或正在加载以响应回发。
Page.IsPostBack Property
通常,控件绑定在Page_Load方法中,您可能需要在此处检查Page.IsPostBack。