如何使用.NET C#中的select as:checkbox循环选择asp:label或asp:PlaceHolder标记? [英] How to for loop asp:label or asp:PlaceHolder tag with select asp:checkbox any checkbox in .NET C#?

查看：49 发布时间：2021/5/9 18:44:39 c# html asp.net for-loop

本文介绍了如何使用.NET C#中的select as:checkbox循环选择asp:label或asp:PlaceHolder标记?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

如何通过.NET C#中的任何复选框选择 asp:checkbox 来循环 asp:label 或 asp:PlaceHolder 标签.不能在.NET C#中选择 asp:checkbox 任何复选框来循环 asp:label 或 asp:PlaceHolder 标签.

How to for loop asp:label or asp:PlaceHolder tag with select asp:checkbox any checkbox in .NET C# , because I can't for loop asp:label or asp:PlaceHolder tag with select asp:checkbox any checkbox in .NET C#.

我的完整源代码.

https://github.com/doanga2007/CheckLoopQR

底部的示例代码.

Default.aspx(HTML代码)

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CheckLoopQR.Default" %>

<!DOCTYPE html>

<html>
<head runat="server">
    <title></title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript" src="//code.jquery.com/jquery-1.6.4.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
    <script type="text/javascript">
    $(window).load(function(){

    $("#checkAll").change(function () {
    $("input:checkbox").prop('checked', $(this).prop("checked"));
    });
    });
    </script>

</head>
<body>
    <form id="form1" runat="server">
        <div class="container">
            <h2>QR Code Generator</h2>
            <div class="row">
                <div class="col-md-4">
                    <div class="form-group">
                        <label>Please Input Data</label>
                        <div class="input-group">
                            <asp:TextBox ID="txtQRCode" runat="server" CssClass="form-control"></asp:TextBox>
                            <div class="input-group-prepend">
                                <asp:Button ID="btnGenerate" runat="server" CssClass="btn btn-secondary" Text="Generate" OnClick="btnGenerate_Click" />
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <asp:Button ID="btnSelect" runat="server" CssClass="btn btn-secondary" Text="Display Text" OnClick="btnSelect_Click" /><br /><br />

            <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder><br /><br />

            <p><label><input type="checkbox" id="checkAll"/> Check all</label></p>

            <asp:CheckBoxList 
            ID="CheckBox1"
            runat="server"
            Border="1"
            BorderColor="LightGray"
            Font-Size="Large"></asp:CheckBoxList>  

        </div>
    </form>
</body>
</html>

Default.aspx.cs(C#代码)

using System;
using System.Drawing;
using System.IO;
using ZXing.Common;
using ZXing;
using ZXing.QrCode;
using System.Web.UI.WebControls;

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

        }
        protected void btnSelect_Click(object sender, EventArgs e)
        {
            string code = txtQRCode.Text;
            long num = Convert.ToInt64(code);

            int i;

            for (i = 1; i < 11; i++)
            {
                num += i;
                CheckBox1.Items.Add(new ListItem(" " + num));
            }
        }
        protected void btnGenerate_Click(object sender, EventArgs e)
        {
            if (CheckBox1.SelectedItem == null)
            {
                Response.Redirect("Default.aspx");
            }

            string code = CheckBox1.SelectedItem.Text;

            CheckBox1.Visible = false;

            QrCodeEncodingOptions options = new QrCodeEncodingOptions();

            options = new QrCodeEncodingOptions
            {
                DisableECI = true,
                CharacterSet = "UTF-8",
                Width = 150,
                Height = 150,
                Margin = 0,
            };

            var barcodeWriter = new BarcodeWriter();
            barcodeWriter.Format = BarcodeFormat.QR_CODE;
            barcodeWriter.Options = options;

            System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
            imgBarCode.Height = 150;
            imgBarCode.Width = 150;

            using (Bitmap bitMap = barcodeWriter.Write(code))
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    byte[] byteImage = ms.ToArray();
                    imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
                }
                PlaceHolder1.Controls.Add(imgBarCode);
            }
        }
    }
}

推荐答案

好消息:我已经回答了如何通过选择asp:checkbox来循环asp:label或asp:PlaceHolder标记任意复选框.NET C#中的代码(+无需声明Microsoft SQL Server数据库的奖励).

Good news : I have answer to How to for loop asp:label or asp:PlaceHolder tag with select asp:checkbox any checkbox in .NET C# (+ Bonus without declare Microsoft SQL Server database).

我的完整源代码.

https://github.com/doanga2007/CheckLoopQR

Default.aspx(HTML代码)

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CheckLoopQR.Default" %>

<!DOCTYPE html>

<html>
<head runat="server">
    <title></title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript" src="//code.jquery.com/jquery-1.6.4.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
    <script type="text/javascript">
    $(window).load(function(){

    $("#checkAll").change(function () {
    $("input:checkbox").prop('checked', $(this).prop("checked"));
    });
    });
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div class="container">
            <h2>QR Code Generator</h2>
            <div class="row">
                <div class="col-md-4">
                    <div class="form-group">
                        <label>Please Input Data</label>
                        <div class="input-group">
                            <asp:TextBox ID="txtQRCode" runat="server" CssClass="form-control"></asp:TextBox>
                            <div class="input-group-prepend">
                                <asp:Button ID="btnGenerate" runat="server" CssClass="btn btn-secondary" Text="Generate" OnClick="btnGenerate_Click" />
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <asp:Button ID="btnSelect" runat="server" CssClass="btn btn-secondary" Text="Display Text" OnClick="btnSelect_Click" /><br /><br />

            <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>

            <asp:CheckBox ID="checkAll" runat="server" Font-Size="Large"/><asp:Label id="checkTextAll" runat="server" Font-Size="Large"></asp:Label><br /><br />

            <asp:CheckBoxList ID="CheckBox1" runat="server" Border="1"
            BorderColor="LightGray" Font-Size="Large"></asp:CheckBoxList>  

        </div>
    </form>
</body>
</html>

Default.aspx.cs(C#代码)

using System;
using System.Drawing;
using System.IO;
using ZXing.Common;
using ZXing;
using ZXing.QrCode;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace CheckLoopQR
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.checkTextAll.Text = " Check All";
        }
        protected void btnSelect_Click(object sender, EventArgs e)
        {
            string code = txtQRCode.Text;
            long num = Convert.ToInt64(code);

            int i;

            for (i = 1; i < 4; i++)
            {
                num += i;
                CheckBox1.Items.Add(new ListItem(" " + num));
            }
        }
        protected void btnGenerate_Click(object sender, EventArgs e)
        {
            if (CheckBox1.SelectedItem == null)
            {
                Response.Redirect("Default.aspx");
            }

            string[] texture = { "Selected Item Text1 : ", "Selected Item Text2 : ", "Selected Item Text3 : " };
            int a = 0;

            foreach (ListItem listItem in CheckBox1.Items)
            {
                if (listItem.Selected)
                {
                    a++;

                    string code = listItem.Text;

                    CheckBox1.Visible = false;
                    checkAll.Visible = false;
                    checkTextAll.Visible = false;

                    QrCodeEncodingOptions options = new QrCodeEncodingOptions();

                    options = new QrCodeEncodingOptions
                    {
                        DisableECI = true,
                        CharacterSet = "UTF-8",
                        Width = 150,
                        Height = 150,
                        Margin = 0,
                    };

                    var barcodeWriter = new BarcodeWriter();
                    barcodeWriter.Format = BarcodeFormat.QR_CODE;
                    barcodeWriter.Options = options;

                    System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
                    imgBarCode.Height = 150;
                    imgBarCode.Width = 150;

                    Label lblvalues = new Label();
                    lblvalues.Text += texture[a-1] + listItem.Text;
                    lblvalues.Font.Size = FontUnit.Large;
                    Label lblvalues2 = new Label();
                    lblvalues2.Text += texture[a-1] + listItem.Text;
                    lblvalues2.Font.Size = FontUnit.Large;
                    Label lblvalues3 = new Label();
                    lblvalues3.Text += texture[a-1] + listItem.Text;
                    lblvalues3.Font.Size = FontUnit.Large;

                    using (Bitmap bitMap = barcodeWriter.Write(code))
                    {
                        using (MemoryStream ms = new MemoryStream())
                        {
                            bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                            byte[] byteImage = ms.ToArray();
                            imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
                        }
                        PlaceHolder1.Controls.Add(imgBarCode);
                        PlaceHolder1.Controls.Add(new HtmlGenericControl("br"));
                        PlaceHolder1.Controls.Add(lblvalues);
                        PlaceHolder1.Controls.Add(new HtmlGenericControl("br"));
                        PlaceHolder1.Controls.Add(lblvalues2);
                        PlaceHolder1.Controls.Add(new HtmlGenericControl("br"));
                        PlaceHolder1.Controls.Add(lblvalues3);
                        PlaceHolder1.Controls.Add(new HtmlGenericControl("br"));
                    }
                }
                else
                {
                    //do something else 
                }
            }
        }
    }
}

这篇关于如何使用.NET C#中的select as:checkbox循环选择asp:label或asp:PlaceHolder标记?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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如何使用.NET C#中的select as:checkbox循环选择asp:label或asp:PlaceHolder标记? [英] How to for loop asp:label or asp:PlaceHolder tag with select asp:checkbox any checkbox in .NET C#?

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如何使用.NET C#中的select as:checkbox循环选择asp:label或asp:PlaceHolder标记? [英] How to for loop asp:label or asp:PlaceHolder tag with select asp:checkbox any checkbox in .NET C#?

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