用户单击删除按钮时如何删除动态控件（文本框和按钮）

Posted 2023-03-31

【中文标题】用户单击删除按钮时如何删除动态控件（文本框和按钮）

【英文标题】：how to delete dynamic control(textbox and button) when user click delete button

【发布时间】：2010-12-25 20:07:05

【问题描述】：

这是我的代码，我想知道当用户单击删除按钮时如何添加一些代码来删除动态控件（文本框和按钮）。请帮帮我T_T

使用系统； 使用 System.Collections.Generic； 使用 System.Linq； 使用 System.Web； 使用 System.Web.UI； 使用 System.Web.UI.WebControls； 使用 System.Globalization；

公共部分类_默认：System.Web.UI.Page

protected void Page_Load(object sender, EventArgs e)

    if (IsPostBack)
    
        CreateTextBox();
    
    else
    
        Session["arrayTextBox"] = null;
        Session["arrayButton"] = null;
    


protected void CreateTextBox()

    List<TextBox> arrayTextBox = new List<TextBox>();

    List<Button> arrayButton = new List<Button>();

    if (TextBox1.Text != "")
                
        if (Session["arrayTextBox"] != null)
        
            arrayTextBox = (List<TextBox>)Session["arrayTextBox"];
            arrayButton = (List<Button>)Session["arrayButton"];
        

        TextBox aTextBox = new TextBox();

        aTextBox.ID = "aTextBox" + arrayTextBox.Count.ToString();
        aTextBox.Text = TextBox1.Text;

        Button ButtonDelete = new Button();
        ButtonDelete.ID = "ButtonDelete" + arrayButton.Count.ToString();
        ButtonDelete.Text = "Delete";

        //if (TextBox2.Text != "")
        //
        //    String red = TextBox2.Text.ToString().Substring(0, 2);
        //    String green = TextBox2.Text.ToString().Substring(2, 2);
        //    String blue = TextBox2.Text.ToString().Substring(4, 2);

        //    int r = int.Parse(red, NumberStyles.AllowHexSpecifier);
        //    int g = int.Parse(green, NumberStyles.AllowHexSpecifier);
        //    int b = int.Parse(blue, NumberStyles.AllowHexSpecifier);

        //    aTextBox.BackColor = System.Drawing.Color.FromArgb(r, g, b);
        //

        arrayTextBox.Add(aTextBox);
        arrayButton.Add(ButtonDelete);

        for(int i=0;i<arrayTextBox.Count;i++)
                      
            PlaceHolder1.Controls.Add(arrayTextBox[i]);
            PlaceHolder1.Controls.Add(arrayButton[i]);
            PlaceHolder1.Controls.Add(new LiteralControl(@"<br />"));
        

        //ButtonDelete.Click += new EventHandler(ButtonDelete_Click);


        Session["arrayTextBox"] = arrayTextBox;
        Session["arrayButton"] = arrayButton;

        TextBox1.Text = "";
        //TextBox2.Text = "";
    

【参考方案1】：

foreach arrayTextBox 并获取 TextBox，然后使用 PlaceHolder1.Controls.Remove(Textbox)

【参考方案2】：

您可以使用下面的代码。 注意：我使用按钮的CommandArgument来存储对应文本框的id，然后在btn点击事件中使用Page.Controls.Remove：

protected void Page_Load(object sender, EventArgs e)

    if (IsPostBack)
    
        CreateTextBox();
    
    else
    
        Session["arrayTextBox"] = null;
        Session["arrayButton"] = null;
    


protected void ButtonDelete_Click(object Sender, EventArgs e)

    Button btn = Sender as Button;
    if(btn != null)
    
        String szTextControlID = btn.CommandArgument;
        Control ctl = Page.FindControl(szTextControlID);
        Page.Controls.Remove(ctl);
        Page.Controls.Remove(btn);
    


protected void CreateTextBox()

    List<TextBox> arrayTextBox = new List<TextBox>();

    List<Button> arrayButton = new List<Button>();

    if (TextBox1.Text != "")
                
        if (Session["arrayTextBox"] != null)
        
            arrayTextBox = (List<TextBox>)Session["arrayTextBox"];
            arrayButton = (List<Button>)Session["arrayButton"];
        

        TextBox aTextBox = new TextBox();

        aTextBox.ID = "aTextBox" + arrayTextBox.Count.ToString();
        aTextBox.Text = TextBox1.Text;

        Button ButtonDelete = new Button();
        ButtonDelete.ID = "ButtonDelete" + arrayButton.Count.ToString();
                ButtonDelete.CommandArgument = aTextBox.ID;
        ButtonDelete.Text = "Delete";
                ButtonDelete.Click += new EventHandler(ButtonDelete_Click);

        //if (TextBox2.Text != "")
        //
        //    String red = TextBox2.Text.ToString().Substring(0, 2);
        //    String green = TextBox2.Text.ToString().Substring(2, 2);
        //    String blue = TextBox2.Text.ToString().Substring(4, 2);

        //    int r = int.Parse(red, NumberStyles.AllowHexSpecifier);
        //    int g = int.Parse(green, NumberStyles.AllowHexSpecifier);
        //    int b = int.Parse(blue, NumberStyles.AllowHexSpecifier);

        //    aTextBox.BackColor = System.Drawing.Color.FromArgb(r, g, b);
        //

        arrayTextBox.Add(aTextBox);
        arrayButton.Add(ButtonDelete);

        for(int i=0;i<arrayTextBox.Count;i++)
                      
            PlaceHolder1.Controls.Add(arrayTextBox[i]);
            PlaceHolder1.Controls.Add(arrayButton[i]);
            PlaceHolder1.Controls.Add(new LiteralControl(@"<br />"));
        




        Session["arrayTextBox"] = arrayTextBox;
        Session["arrayButton"] = arrayButton;

        TextBox1.Text = "";
        //TextBox2.Text = "";