我在我的webform中有一个列表框,我试图从中选择多个值,但我只得到最后选择的值。我尝试了两种方式。首先,我明确添加了列表项:
<asp:ListBox ID="ListBox2" runat="server"
SelectionMode="Multiple" AutoPostBack="True">
<asp:ListItem>teama</asp:ListItem>
<asp:ListItem>teamb</asp:ListItem>
</asp:ListBox>
第二,我试图绑定到数据库中的表:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ListBox2.SelectionMode = ListSelectionMode.Multiple;
string scon = ConfigurationManager.ConnectionStrings["Test_AthiraConnectionString"].ConnectionString;
SqlConnection con=new SqlConnection(scon);
con.Open();
SqlCommand cmd = new SqlCommand("select department from department", con);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
ListBox2.DataSource = ds;
ListBox2.DataValueField = "department";
ListBox2.DataTextField = "department";
ListBox2.DataBind();
con.Close();
}
}
然后我尝试了这些不同的方法来选择多个项目
buttonclick event
第一:
string k =null ,k1 = null;
foreach (int i in ListBox2.GetSelectedIndices())
{
k1 = ListBox2.Items[i].Text + "/";
k += k1;
Response.Write(k);
}
第二:
foreach (ListItem li in ListBox2.Items)
{
if (li.Selected == true)
{
k += li.Text + "/";
Response.Write(k);
}
}
第三:
k = String.Join("/", ListBox2.Items
.Cast<ListItem>()
.Where(i => i.Selected)
.Select(i=>i.Value)
.ToArray());
Response.Write(k);
第四:
for (int i = ListBox2.Items.Count - 1; i >= 0; i--)
{
if (ListBox2.Items[i].Selected == true)
{
k1 = ListBox2.Items[i].Text + "/";
k += k1;
Response.Write(k);
}
}
但它们似乎都不起作用。我只得到最后一个选定的值。