• 后台添加控件时,必须每次重画控件,才能从前台获取控件数据。


    本文实例讲述了C#后台创建控件并获取值的方法。分享给大家供大家参考。具体实现方法如下:

    前台代码:

    复制代码代码如下:
    <form id="form1" runat="server">
        <div>
            <div class="item">
                Please input a number:
                <asp:TextBox runat="server" CssClass="item" ID="txtTextCount"></asp:TextBox>
               
                <asp:Button runat="server" ID="btnCreate" Text="Create TextBox List" ValidationGroup="CreateTextBox"
                    OnClick="btnCreate_Click" />  
                <asp:Button runat="server" ID="btnOK" Text="获取控件值" ValidationGroup="ShowListContent"
                    OnClick="btnOK_Click" />
            </div>
            <div runat="server" id="divControls" class="item">
            </div>
            <div runat="server" id="divMessage">
            </div>
        </div>
    </form>

    后台代码:

    复制代码代码如下:
    protected void Page_Load(object sender, EventArgs e)
        {
            if (this.IsPostBack)
            {
                int txtCount = int.Parse(txtTextCount.Text);

     

                // 注意:每次PostBack时,都需要重新动态创建TextBox 
                CreateTextBoxList(txtCount);
            }
        }
        ///<summary> 

        /// Create textbox list 
        ///</summary> 
        ///<param name="num">textbox list count</param> 
        private void CreateTextBoxList(int num)
        {
            HtmlGenericControl div;
            HtmlGenericControl span;
            TextBox txt;
            //RegularExpressionValidator rev;

            for (int i = 0; i < num; i++)
            {
                //创建div 
                div = new HtmlGenericControl();
                div.TagName = "div";
                div.ID = "divTextBox" + i.ToString();
                div.Attributes["class"] = "item2";

                //创建span 
                span = new HtmlGenericControl();
                span.ID = "spanTextBox" + i.ToString();
                span.InnerHtml = "Url Address" + (i + 1).ToString() + ":";

                //创建TextBox 
                txt = new TextBox();
                txt.ID = "txt" + i.ToString();
                txt.CssClass = "input";

                //创建格式验证控件,并且将其关联到对应的TextBox 
                //rev = new RegularExpressionValidator();
                //rev.ID = "rev" + i.ToString();
                //rev.ControlToValidate = txt.ID;
                //rev.Display = ValidatorDisplay.Dynamic;
                //rev.ValidationGroup = "ShowListContent";
                //rev.ValidationExpression = @"(http(s)?://)?([w-]+.)+[w-]+(/[w- ./?%&=]*)?";
                //rev.ErrorMessage = "Invalid url Address!";

                //添加控件到容器 
                div.Controls.Add(span);
                div.Controls.Add(txt);
                //div.Controls.Add(rev);
                divControls.Controls.Add(div);
            }
        }

        protected void btnCreate_Click(object sender, EventArgs e)
        {
            txtTextCount.Enabled = false;
            btnCreate.Enabled = false;
        }

        protected void btnOK_Click(object sender, EventArgs e)
        {
            TextBox txt;
            HtmlGenericControl span;
            StringBuilder sbResult = new StringBuilder();
            int txtCount = int.Parse(txtTextCount.Text);

            //遍历获取动态创建的TextBox们中的Text值 
            for (int i = 0; i < txtCount; i++)
            {
                //注意:这里必须通过上层容器来获取动态创建的TextBox,才能获取取ViewState内容 
                txt = divControls.FindControl("txt" + i.ToString()) as TextBox;

                if (txt != null && txt.Text.Trim().Length > 0)
                {
                    sbResult.AppendFormat("Url Address{0}: {1}.<br />", i + 1, txt.Text.Trim());
                }
            }
            //遍历获取动态创建的TextBox们中的Text值 
            for (int i = 0; i < txtCount; i++)
            {
                //注意:这里必须通过上层容器来获取动态创建的TextBox,才能获取取ViewState内容 
                span = divControls.FindControl("spanTextBox" + i.ToString()) as  HtmlGenericControl ;

                if (span != null && span.InnerText.Trim().Length > 0)
                {
                    sbResult.AppendFormat("Url Address{0}: {1}.<br />", i + 1, span.InnerText.Trim());
                }
            }
            divMessage.InnerHtml = sbResult.ToString();
    }

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  • 原文地址:https://www.cnblogs.com/guanshan/p/guan2015-9-22.html
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