c# - 動的セッション変数ストア (テーブルは 3 回目の試行では機能しません)

Question

以前に誰かからコードを入手し、自分の好みに合わせて調整しました。ただし、コードを誤解している可能性がありますが、ボタンを3回クリックすると、テーブルがすべておかしくなります。テーブル付きの動的テキストボックスを作成し、「ここをクリックして事故を追加」をクリックするたびにセッションに保存しています。

2 回目のクリック:

2回目のクリック

3 回目のクリック:

3回目のクリック

私はそれをデバッグしようとしましたが、なぜこれを行うのか意味がありません。私のコードは正しいと思いますが、何が問題なのかわかりません。

public partial class employment_driversapplication_History : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{


}

protected int TotalNumberAdded
{
    get { return (int)(ViewState["TotalNumberAdded"] ?? 0); }
    set { ViewState["TotalNumberAdded"] = value; }


}



protected void AccidentButton_Click(object sender, EventArgs e)
{
    TotalNumberAdded++;
   // AddControls(TotalNumberAdded);
    BuildControls();


}
protected void PrevPage_Click(object sender, EventArgs e)
{

    Response.Redirect("employment_driversapplication_personalinfo.aspx");

}

private IList<TextBox> AddedControls = new List<TextBox>();
private IList<Label> AddedControlsLabel = new List<Label>();
protected override void CreateChildControls()
{
    BuildControls();
    base.CreateChildControls();
}

private void BuildControls()
{






    AccidentPlaceHolder.Controls.Add(new LiteralControl("<table><tr>"));
    AccidentPlaceHolder.Controls.Add(new LiteralControl("<br />"));

    for (var Nl = 0; Nl < TotalNumberAdded; Nl++)
    {
        var idNL = String.Format("NatureLabel{0}", Nl);


        //Check if control was already added 
        //only create controls that are new for this postback
        if (AccidentPlaceHolder.FindControl(idNL) == null)
        {
            var NLabel = new Label() { ID = idNL };
            NLabel.Text = "Nature Of Accident: ";
            AccidentPlaceHolder.Controls.Add(new LiteralControl("<td class='title-text'>"));
            AccidentPlaceHolder.Controls.Add(NLabel);

            AddedControlsLabel.Add(NLabel);

        }
    }




    for (var x = 0; x < TotalNumberAdded; x++)
    {
        var idN = String.Format("NatureTextBox{0}", x);

        //Check if control was already added 
        //only create controls that are new for this postback
        if (AccidentPlaceHolder.FindControl(idN) == null)
        {
            var NtextBox = new TextBox() { ID = idN };

            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td><td class='title-text'width='180px'>"));
            AccidentPlaceHolder.Controls.Add(NtextBox);

            AddedControls.Add(NtextBox);

        }
    }

    for (var DL = 0; DL < TotalNumberAdded; DL++)
    {
        var idDL = String.Format("DateLabel{0}", DL);


        //Check if control was already added 
        //only create controls that are new for this postback
        if (AccidentPlaceHolder.FindControl(idDL) == null)
        {
            var DLabel = new Label() { ID = idDL };
            DLabel.Text = "Date: ";
            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td><td class='title-text'>"));
            AccidentPlaceHolder.Controls.Add(DLabel);

            AddedControlsLabel.Add(DLabel);

        }
    }


    for (var d = 0; d < TotalNumberAdded; d++)
    {
        var idD = String.Format("DateTextBox{0}", d);
        if (AccidentPlaceHolder.FindControl(idD) == null)
        {

            var DtextBox = new TextBox() { ID = idD };

            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td><td class='title-text'width='180px'>"));
            AccidentPlaceHolder.Controls.Add(DtextBox);
            AddedControls.Add(DtextBox);
            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td></tr>"));

        }


    }

    for (var FL = 0; FL < TotalNumberAdded; FL++)
    {
        var idFL = String.Format("FatalLabel{0}", FL);


        //Check if control was already added 
        //only create controls that are new for this postback
        if (AccidentPlaceHolder.FindControl(idFL) == null)
        {
            var FLabel = new Label() { ID = idFL };
            FLabel.Text = "Fatalities: ";
            AccidentPlaceHolder.Controls.Add(new LiteralControl("<tr><td class='title-text'>"));
            AccidentPlaceHolder.Controls.Add(FLabel);

            AddedControlsLabel.Add(FLabel);

        }
    }
    for (var f = 0; f < TotalNumberAdded; f++)
    {
        var idF = String.Format("FatalTextBox{0}", f);
        if (AccidentPlaceHolder.FindControl(idF) == null)
        {

            var FtextBox = new TextBox() { ID = idF };
            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td><td class='title-text'width='180px'>"));
            AccidentPlaceHolder.Controls.Add(FtextBox);
            AddedControls.Add(FtextBox);


        }


    }

    for (var IL = 0; IL < TotalNumberAdded; IL++)
    {
        var idIL = String.Format("InjuryLabel{0}", IL);


        //Check if control was already added 
        //only create controls that are new for this postback
        if (AccidentPlaceHolder.FindControl(idIL) == null)
        {
            var ILabel = new Label() { ID = idIL };
            ILabel.Text = "Injuries: ";
            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td><td class='title-text'>"));
            AccidentPlaceHolder.Controls.Add(ILabel);

            AddedControlsLabel.Add(ILabel);

        }
    }
    for (var i = 0; i < TotalNumberAdded; i++)
    {
        var idI = String.Format("InjuryTextBox{0}", i);
        if (AccidentPlaceHolder.FindControl(idI) == null)
        {

            var ItextBox = new TextBox() { ID = idI };

            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td><td class='title-text'width='180px'>"));
            AccidentPlaceHolder.Controls.Add(ItextBox);
            AddedControls.Add(ItextBox);
            AccidentPlaceHolder.Controls.Add(new LiteralControl("</td></tr>"));

        }


    }
    AccidentPlaceHolder.Controls.Add(new LiteralControl("</table>"));
}

protected override void OnPreRender(EventArgs e)
{
    foreach (var ctrl in AddedControls)
    {
        var key = ctrl.ID.Replace("TextBox", String.Empty);
        Session[key] = ctrl.Text;
    }

    foreach (string session in Session.Keys)
    {
        System.Diagnostics.Debug.WriteLine(String.Format("{0} = {1}", session, Session[session]));
    }
    base.OnPreRender(e);
}

}

どんな助けでも大歓迎です...私はそれを数時間探してデバッグしてきましたが、何も修正されていません。

score 1 · Accepted Answer

このためにリピーターを実装しようとしましたか？リテラルコントロールを追加すると、すぐに手に負えなくなり、デバッグが難しくなるため、はるかに簡単になります。

リピーターコントロールの用途の 1 つは、データ項目ごとに html の出力を繰り返すことです。あなたの場合、事故ごとにテーブルの出力を繰り返します。

たとえば、これはフロントエンドのコードになります。

<asp:Repeater ID="rptAccidents" runat="server">
    <ItemTemplate>
        <table>
            <tr>
                <td class="title-text">
                    Nature Of Accident
                </td>
                <td class='title-text' width='180px'>
                    <asp:TextBox ID="txtNature" runat="server" />
                </td>
                <td class="title-text">
                    Date
                </td>
                <td class='title-text' width='180px'>
                    <asp:TextBox ID="txtDate" runat="server" />
                </td>
            </tr>
            ....NEXT ROWS
        </table>
    </ItemTemplate>
    <SeparatorTemplate>
        <br />
    </SeparatorTemplate>
</asp:Repeater>

そして、これはコードビハインドにあります。

    //HERE YOU ARE ATTACHING TO THE REPEATER'S ITEMDATABOUND EVENT
    //THIS ALLOWS YOU TO CONTROL THE OUTPUT FOR EACH ACCIDENT
    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
        this.rptAccidents.ItemDataBound += rptAccidents_ItemDataBound;
    }

    //THIS IS THE CODE THAT WILL RUN FOR EACH DATA ITEM IN THE REPEATER'S DATA SOURCE
    void rptAccidents_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        //in this case, you only care about the item templates
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            //cast your dataitem here
            Accident data = (Accident)data;
            //find the appropriate textbox (or any other control that is runat="server", and set the value.
            ((TextBox)e.Item.FindControl("txtNature")).Text = data.Nature;
            ((TextBox)e.Item.FindControl("txtDate")).Text = data.Date;
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.rptAccidents.DataSource = //I AM NOT SURE WHERE YOU ARE STORING THE DATA. BUT HERE IS WHERE YOU WOULD SET THE REPEATERS DATA SOURCE
            this.rptAccidents.DataBind(); //THIS LINE CAUSES THE REPEAT TO BIND ITSELF TO YOUR DATA SOURCE
        }
    }

c# - 動的セッション変数ストア (テーブルは 3 回目の試行では機能しません)

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