如何动态创建文本框和按钮并从c＃中的每个文本框中获取值？

Question

我正在尝试使用文本框和每个表中的按钮动态地构建表。 表格已成功添加，但是当我按下按钮时，它在页面上发了帖，表格消失了。 因此，我在updatePanel中构建了每个表，但是当两次单击按钮时，又发生了回发。如何防止回滚？ 然后，如何获取文本框中的值？ TNX非常！

private void addTable(List<fileSaving> fs)
{  
    foreach (fileSaving f in fs){
    UpdatePanel up = new UpdatePanel();
    up.ID = "UpdatePanel-"+f.FileName;
    up.UpdateMode = UpdatePanelUpdateMode.Conditional;
    Table T = new Table();
    T.CssClass = "filesTBL";

    TableRow hTR = new TableRow();

    TableCell td1 = new TableCell();
    Image fileImg = new Image();
    fileImg.ImageUrl = "images/"+f.FileExtension+".png";
    td1.Controls.Add(fileImg);
    hTR.Cells.Add(td1);

    TableCell td2 = new TableCell();
    td2.Text = f.ExpName;
    hTR.Cells.Add(td2);

    TableCell td3 = new TableCell();
    Image expImg = new Image();
    expImg.ImageUrl = "images/magnet.png";
    td3.Controls.Add(expImg);
    hTR.Cells.Add(td3);

    T.Rows.Add(hTR);

    TableRow mTR = new TableRow();

    TableCell td4 = new TableCell();
    td4.Text = "";
    mTR.Cells.Add(td4);

    TableCell td5 = new TableCell();
    td5.Text = f.TeamID.ToString();
    mTR.Cells.Add(td5);

    TableCell td6 = new TableCell();
    Image teamImg = new Image();
    teamImg.ImageUrl = "images/team3.png";
    td6.Controls.Add(teamImg);
    mTR.Cells.Add(td6);

    T.Rows.Add(mTR);
    TableRow lTR = new TableRow();

    TableCell td7 = new TableCell();
    HyperLink downloadLink = new HyperLink();
    downloadLink.Attributes.Add("href", "http://proj.ruppin.ac.il/igroup39/test2/tar5/tar5.zip");
    downloadLink.ImageUrl = "images/download2.png";
    downloadLink.ToolTip = "לחץ להורדה";
    td7.Controls.Add(downloadLink);
    lTR.Cells.Add(td7);

    TableCell td8 = new TableCell();
    if (f.ReportGrade != -1)
    {
        td8.Text = f.ReportGrade.ToString();
    }
    else
    {
        TextBox tb = new TextBox();
        tb.ID = f.FileName + "-tb";
        gFN = tb.ID;
        tb.Width = 40;
        td8.Controls.Add(tb);

        Button btn = new Button();
        btn.ID = f.FileName + "-btn";
        btn.Text = "הזן ציון";
        btn.Click += new EventHandler(btn_Click);
        td8.Controls.Add(btn);

    }

    lTR.Cells.Add(td8);

    TableCell td9 = new TableCell();
    Image gradeImg = new Image();
    gradeImg.ImageUrl = "images/grade.png";
    td9.Controls.Add(gradeImg);
    lTR.Cells.Add(td9);

    T.Rows.Add(lTR);
    up.ContentTemplateContainer.Controls.Add(T);
    Page.Form.Controls.Add(up);
    }

}

protected void btn_Click(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        Button mybtn = (Button)sender;
        Response.Write(mybtn.ID);
    }

}

Answer 1

因此，经过长时间的思考，在一位朋友的帮助下，我在page_load编写了此代码，因此当按下按钮并发生回发时，页面将重建我的动态控件，但是只有按下按钮时，这就是角色session 。 我的新代码：

protected void Page_Load(object sender, EventArgs e)
{
    if (IsPostBack)
    {

        if (Session["showFiles"] != null)
        {
            bool flag = (bool)Session["showFiles"];
            if (flag == true)
            {
                fileSaving fs = new fileSaving();
                List<fileSaving> fileslist = fs.filesList(hiddenLBL.Text);
                addTable(fileslist);
            }
        }
    }
    ExpScheduleClass ESCC = new ExpScheduleClass();
    List<string> labCourses = ESCC.getCourseList();
    // dynamically create a dropdown list (aka DDL)
    DDLCourses = new DropDownList();
    DDLCourses.DataSource = labCourses; // set the data source
    DDLCourses.DataBind(); // bind the data to the DDL control
    DDLCourses.AutoPostBack = true;
    DDLCourses.SelectedIndexChanged += DDLCourses_SelectedIndexChanged;
    coursePH.Controls.Add(DDLCourses);

}

private void DDLCourses_SelectedIndexChanged(object sender, EventArgs e)
{
    string[] coursesIDArr = DDLCourses.SelectedValue.Split(' ');
    /* courseLBL.Text = coursesIDArr[0];
     string courseID = coursesIDArr[0];//take the id from the list*/
    courseLBL.Text = coursesIDArr[2];
    classLBL.Text = coursesIDArr[4];
    currnetYearLBL.Text = coursesIDArr[6];
    semesterLBL.Text = coursesIDArr[8];
    courseLBL.ForeColor = System.Drawing.Color.Black;
    currnetYearLBL.ForeColor = System.Drawing.Color.Black;
    semesterLBL.ForeColor = System.Drawing.Color.Black;
    classLBL.ForeColor = System.Drawing.Color.Black;
    ExpScheduleClass SIEGL = new ExpScheduleClass();
    List<String> lessonsList = SIEGL.getLessonList(coursesIDArr[2]);
    DDLLessons.DataSource = lessonsList; // set the data source
    DDLLessons.DataBind();
}

protected void DDLLessons_SelectedIndexChanged(object sender, EventArgs e)
{
    string[] lessonsIdArr = DDLLessons.SelectedValue.Split(' ');
    string lessonID = lessonsIdArr[0];
    lessonLBL.Text = lessonID;
    dateLBL.Text = lessonsIdArr[1];
    lessonLBL.ForeColor = System.Drawing.Color.Black;
    hiddenLBL.Text = lessonID;
    fileSaving fs = new fileSaving();
    List<fileSaving> fileslist = fs.filesList(lessonID);
    addTable(fileslist);
    Session["showFiles"] = true;

}
private void addTable(List<fileSaving> fs)
{
    foreach (fileSaving f in fs)
    {
        UpdatePanel up = new UpdatePanel();
        up.ID = "UpdatePanel-" + f.FileName;
        up.UpdateMode = UpdatePanelUpdateMode.Conditional;
        Table T = new Table();
        T.CssClass = "filesTBL";

        //------------Header Row------------------------------------------------
        TableRow hTR = new TableRow();

        TableCell td1 = new TableCell();
        Image fileImg = new Image();
        fileImg.ImageUrl = "images/" + f.FileExtension + ".png";
        td1.Controls.Add(fileImg);
        hTR.Cells.Add(td1);

        TableCell td2 = new TableCell();
        td2.Text = f.ExpName;
        hTR.Cells.Add(td2);

        TableCell td3 = new TableCell();
        Image expImg = new Image();
        expImg.ImageUrl = "images/magnet.png";
        td3.Controls.Add(expImg);
        hTR.Cells.Add(td3);

        T.Rows.Add(hTR);

        //------------Middle Row------------------------------------------------
        TableRow mTR = new TableRow();

        TableCell td4 = new TableCell();
        td4.Text = "";
        mTR.Cells.Add(td4);

        TableCell td5 = new TableCell();
        td5.Text = f.TeamID.ToString();
        mTR.Cells.Add(td5);

        TableCell td6 = new TableCell();
        Image teamImg = new Image();
        teamImg.ImageUrl = "images/team3.png";
        td6.Controls.Add(teamImg);
        mTR.Cells.Add(td6);

        T.Rows.Add(mTR);
        //------------Last Row------------------------------------------------
        TableRow lTR = new TableRow();

        TableCell td7 = new TableCell();
        HyperLink downloadLink = new HyperLink();
        //downloadLink.Attributes.Add("href", "/igroup39/test2/project/reportFiles/" + f.FileName);
        downloadLink.Attributes.Add("href", "http://proj.ruppin.ac.il/igroup39/test2/tar5/tar5.zip");
        downloadLink.ImageUrl = "images/download2.png";
        downloadLink.ToolTip = "לחץ להורדה";
        td7.Controls.Add(downloadLink);
        lTR.Cells.Add(td7);

        TableCell td8 = new TableCell();
        if (f.ReportGrade != -1)
        {
            td8.Text = f.ReportGrade.ToString();
        }
        else
        {
            TextBox tb = new TextBox();
            tb.ID = f.FileName + "-tb";
            gFN = tb.ID;
            tb.Width = 40;
            td8.Controls.Add(tb);

            Button btn = new Button();
            btn.ID = f.FileName + "-btn";
            btn.Text = "הזן ציון";
            btn.Click += new EventHandler(btn_Click);
            td8.Controls.Add(btn);

        }

        lTR.Cells.Add(td8);

        TableCell td9 = new TableCell();
        Image gradeImg = new Image();
        gradeImg.ImageUrl = "images/grade.png";
        td9.Controls.Add(gradeImg);
        lTR.Cells.Add(td9);

        T.Rows.Add(lTR);
        up.ContentTemplateContainer.Controls.Add(T);
        Page.Form.Controls.Add(up);
        //filesTablesPH.Controls.Add(up);
    }

}

protected void btn_Click(object sender, EventArgs e)
{

    Button mybtn = (Button)sender;
    string btnID = mybtn.ID;
    string[] file_Name = btnID.Split('-');
    string tbID = file_Name[0] + "-tb";
    string grade = ((TextBox)filesTablesPH.FindControl(tbID)).Text;
    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert("+grade+")", true);
}