我正在ASP.net（c＃）中创建一个测验应用程序，我目前有一个问题，一次显示使用数据采集器。然而，当我从问题1移到问题2然后回到问题1时，无线电按钮选择消失了。
编辑 - 我现在让单选按钮保持选择，每当我从下一个移动到前一个，但是，如果我选择radiobutton1然后继续问题2，它已经选择了radiobutton1，即使我还没有回答题。因此，出于某种原因，我在问题1上做出的任何选择都与其他问题重复。
Question1 example Question2 example
<body>
<form id="form1" runat="server">
<div>
<asp:ListView ID="lvCustomers" runat="server" GroupPlaceholderID="groupPlaceHolder1"
ItemPlaceholderID="itemPlaceHolder1" OnPagePropertiesChanging="OnPagePropertiesChanging" OnPreRender="ListPager_PreRender">
<LayoutTemplate>
<div id="itemPlaceHolder1" runat="server">
</div>
<asp:DataPager ID="DataPager1" runat="server" PagedControlID="lvCustomers" PageSize="1">
<Fields>
<asp:NextPreviousPagerField runat="server" ButtonType="Link"
ShowFirstPageButton="false"
ShowPreviousPageButton="true"
ShowNextPageButton="false" />
<asp:NumericPagerField ButtonType="Link" />
<asp:NextPreviousPagerField ButtonType="Link"
ShowNextPageButton="true"
ShowLastPageButton="false"
ShowPreviousPageButton="false" />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#Eval("QuestionID")%>'></asp:Label><br />
<asp:Label ID="Label1" runat="server" Text='<%#Eval("QuestionText")%>'></asp:Label><br />
<li>
<asp:RadioButton ID="Radio1" Text='<%#Eval("Answer1") %>' GroupName="radiobtns" EnableViewState="true" runat="server" />
</li>
<li>
<asp:RadioButton ID="Radio2" runat="server" GroupName="radiobtns" EnableViewState="true" Text='<%#Eval("Answer2") %>' />
</li>
<li>
<asp:RadioButton ID="Radio3" runat="server" GroupName="radiobtns" EnableViewState="true" Text='<%#Eval("Answer3") %>' />
</li>
<li>
<asp:RadioButton ID="Radio4" runat="server" GroupName="radiobtns" EnableViewState="true" Text='<%#Eval("Answer4") %>' />
</li>
<br />
</ItemTemplate>
</asp:ListView>
</div>
<p>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</p>
</form>
</body>
</html>
namespace WebApplication2.WebForms
{
public partial class _1QuestionQuiz : System.Web.UI.Page
{
string userAns;
int QuestionID;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindListView();
if (Session["QuizID"] != null)
{
int QuizID = Convert.ToInt32(Session["QuizID"]);
}
}
}
protected void ListPager_PreRender(object sender, EventArgs e)
{
if (Session["DTSource"] != null)
{
lvCustomers.DataSource = Session["DTSource"];
lvCustomers.DataBind();
}
GetSelections();
}
private void BindListView()
{
SqlConnection conn = new SqlConnection();
string connString = ConfigurationManager.ConnectionStrings["test1ConnectionString"].ConnectionString;
SqlCommand Cmd = new SqlCommand();
conn.ConnectionString = connString;
conn.Open();
if (lvCustomers != null)
{
foreach (ListViewItem item in lvCustomers.Items)
{
Label lbl = (Label)item.FindControl("Label2");
if (lbl != null)
{
QuestionID = Convert.ToInt32(lbl.Text);
ViewState["qstion"] = QuestionID;
}
RadioButton rd1 = (RadioButton)item.FindControl("Radio1");
RadioButton rd2 = (RadioButton)item.FindControl("Radio2");
RadioButton rd3 = (RadioButton)item.FindControl("Radio3");
RadioButton rd4 = (RadioButton)item.FindControl("Radio4");
if (rd1.Checked)
{
userAns = rd1.Text;
ViewState["Radio1"] = rd1.Text;
}
else if (rd2.Checked)
{
userAns = rd2.Text;
ViewState["Radio2"] = rd2.Text;
}
else if (rd3.Checked)
{
userAns = rd3.Text;
ViewState["Radio3"] = rd3.Text;
}
else if (rd4.Checked)
{
userAns = rd4.Text;
ViewState["Radio4"] = rd4.Text;
}
SqlCommand comm = new SqlCommand("InsertSelections", conn);
comm.CommandType = CommandType.StoredProcedure;
SqlDataAdapter adapter = new SqlDataAdapter(comm);
SqlParameter p1 = new SqlParameter("Answer", userAns);
SqlParameter p2 = new SqlParameter("QuestionID", QuestionID);
SqlParameter p3 = new SqlParameter("QuizID", (Session["QuizID"]));
comm.Parameters.Add(p1);
comm.Parameters.Add(p2);
comm.Parameters.Add(p3);
comm.ExecuteNonQuery();
}
}
}
private void GetSelections()
{
foreach (ListViewItem item in lvCustomers.Items)
{
Label lbl = (Label)item.FindControl("Label2");
if (lbl != null)
{
QuestionID = Convert.ToInt32(lbl.Text);
}
RadioButton rd1 = (RadioButton)item.FindControl("Radio1");
RadioButton rd2 = (RadioButton)item.FindControl("Radio2");
RadioButton rd3 = (RadioButton)item.FindControl("Radio3");
RadioButton rd4 = (RadioButton)item.FindControl("Radio4");
//Try radiobutton 1 as a tester
if (rd1 != null)
{
if (lbl != null && ViewState["Radio1"] != null)
{
rd1.Checked = true;
}
}
if (rd2 != null)
{
if (lbl != null && ViewState["Radio2"] != null)
{
rd2.Checked = true;
}
}
if (rd3 != null)
{
if (lbl != null && ViewState["Radio3"] != null)
{
rd3.Checked = true;
}
}
if (rd4 != null)
{
if (lbl != null && ViewState["Radio4"] != null)
{
rd4.Checked = true;
break;
}
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("Score.aspx", false);
}
protected void OnPagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
{
(lvCustomers.FindControl("DataPager1") as DataPager).SetPageProperties(e.StartRowIndex, e.MaximumRows, false);
BindListView();
}
}
}
答案 0 :(得分：0)
尝试重写LoadViewState和SaveViewState以维护单选按钮的状态。例如，尝试类似下面的操作，并在需要的地方将值拉回ViewState：
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
if (ViewState["Radio1"] != null)
Radio1.Text = (int)ViewState["Radio1"];
...
}
protected override object SaveViewState()
{
ViewState["Radio1"] = Radio1.Text;
...
return base.SaveViewState();
}