文字列のリストをグローバル変数として保存し、ボタンをクリックしてそのリストに不明な回数追加し、そのリストをセッションに保存し、別のページでそのセッションデータに適切にアクセスする方法を理解できません. 私は近づいてきましたが、奇妙なことが起こっており、デバッグの努力はさらに異常なことをしています.
Button1_Click() が Button1 の OnClick にバインドされた最初のページ スクリプトを次に示します。
<%@ Page Language="C#" Debug="true" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Web.UI" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>
<%@ Import Namespace="System.Drawing" %>
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta charset="utf-8"/>
<title></title>
<script type="text/javascript">
function validateNums(ele, evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode;
if (charCode > 31 && (charCode < 48 || charCode > 57)) {
if (ele.id == 'TextBox1') {
var i = document.getElementById('TextBox1').value;
document.getElementById('TextBox1').value = i.slice(0, -1);
}
else
{
var b = document.getElementById('TextBox2').value;
document.getElementById('TextBox2').value = b.slice(0, -1);
}
}
}
</script>
<script runat="server">
private static int counter = 0;
List<string> reg = new List<string>();
protected void Page_Load(object sender, EventArgs e)
{
string[] states = { "AK","AL","AR","AS","AZ","CA","CO","CT","DC","DE","FL","GA","GU","HI","IA","ID",
"IL","IN","KS","KY","LA","MA","MD","ME","MH","MI","MN","MO","MS","MT","NC","ND","NE","NH","NJ","NM","NV","NY",
"OH","OK","OR","PA","PR","PW","RI","SC","SD","TN","TX","UT","VA","VI","VT","WA","WI","WV","WY" };
int b = 0;
foreach (string i in states)
{
this.DropDownList1.Items.Add(states[b]);
b++;
}
if (Session["counter"] != null)
{
Session.Clear();
}
else { counter = 0; }
}
protected void Page_Unload(object sender, EventArgs e)
{
Session["counter"] = counter;
}
protected void Button1_Click(object sender, EventArgs e)
{
if (TextBox1.Text.Length == 0) Alert_First();
if (TextBox2.Text.Length == 0) Alert_Second();
if (DropDownList1.SelectedValue == "") Alert_State();
if (TextBox4.Text.Length == 0) Alert_Password();
if (TextBox1.Text.Length != 0 && TextBox2.Text.Length != 0 && DropDownList1.SelectedValue != "")
{
if (Password_Validate()) Save_Registery();
else Alert_Password();
}
}
private bool Password_Validate()
{
foreach (char i in TextBox4.Text)
{
if (char.IsNumber(i))
return true;
}
return false;
}
private void Alert_First()
{
TextBox1.BackColor = Color.Red;
TextBox1.Text = "A value is required";
}
private void Alert_Second()
{
TextBox2.BackColor = Color.Red;
TextBox2.Text = "A value is required";
}
private void Alert_State()
{
DropDownList1.BackColor = Color.Red;
}
private void Alert_Password()
{
TextBox4.BackColor = Color.Red;
TextBox4.Text = "A value is required with at least one numeric value";
}
private void Save_Registery()
{
if (Session["regList"] != null)
{
reg.AddRange((List<string>)Session["regList"]);
}
reg.Add(TextBox1.Text);
reg.Add(TextBox2.Text);
reg.Add(DropDownList1.Text);
reg.Add(TextBox4.Text);
Session["regList"] = reg;
TextBox3.Text = counter.ToString();
counter++;
}
protected void Button2_Click(object sender, EventArgs e)
{
int count = 0;
foreach(string i in reg)
{
TextBox3.Text = TextBox3.Text + reg[0].ToString();
count++;
}
}
</script>
</head>
<body style="margin:auto; max-width:300px;">
<form id="form1" runat="server">
<div style="float:left; max-width:200px;" >
<asp:Label ID="Label1" runat="server" Text="First Name: "></asp:Label><br />
<asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
<br />
<asp:Label ID="Label2" runat="server" Text="Last Name: "></asp:Label>
<br />
<asp:TextBox ID="TextBox2" runat="server" ></asp:TextBox>
<asp:Label ID="Label3" runat="server" Text="State"></asp:Label>
<br />
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem Value="" Text=""></asp:ListItem>
</asp:DropDownList>
<br />
<asp:Label ID="Label4" runat="server" Text="Password: "></asp:Label>
<br />
<asp:TextBox ID="TextBox4" runat="server" ></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
<asp:Label ID="Label5" runat="server" Text="All Fields are Required" Visible="false"></asp:Label>
<asp:TextBox ID="TextBox3" runat="server" TextMode="MultiLine"></asp:TextBox>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
<asp:HiddenField ID="HiddenField1" runat="server" />
</div>
<a href="Results.aspx" style="">
<div>
<p>
Results
</p>
</div>
</a>
</form>
</body>
</html>
そして、これが2番目のページです：
<%@ Page Language="C#" Debug="true" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
int counter = Convert.ToInt16(Session["counter"]);
Repeater1.DataSource = (List<string>)Session["regList"];
Repeater1.DataBind();
}
</script>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<%= Session["counter"] %>
</div>
<asp:Repeater ID="Repeater1" runat="server">
<HeaderTemplate>
<table>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td>
<%# Container.DataItem %>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</form>
</body>
</html>
これにより、前のページで入力した最後のデータ セットのみが出力されます。デバッグを支援するために追加したカウントは、「regList」のセッション変数に 3 つの値しかないことを示しています。私の質問は、Button1_Click() が起動されるたびにデータが上書きされるのはなぜですか?