根据内容来产生一个二维码

实现的功能以及效果如下：

样式代码：

.divtable {
    display: table;
    border-collapse: collapse;
    border-spacing: 0;
    margin-right: auto;
    margin-left: auto;
    width: 100%;
}

.divth, .divtr {
    display: table-row;
    vertical-align: middle;
    height: 20px;
    padding-left: 2px;
    padding-right: 2px;
}

.divth {
    background-color: #efebde;
    text-align: center;
}

.divtd {
    display: table-cell;
    border: 1px solid #c0c0c0;
}

前端ASP.NET 代码：

<div class="divtable" >
                    <div class="divtr">
                        <div class="divtd">
                            内容
                        </div>
                        <div class="divtd" >
                            <asp:TextBox ID="TextBoxQRCode" runat="server" Width="500" TextMode="MultiLine" Rows="20"></asp:TextBox>
                        </div>
                    </div>
                    <div class="divtr"  style="line-height:40px;" >
                        <div class="divtd">
                           尺寸
                        </div>
                        <div class="divtd">
                            宽度：<asp:TextBox ID="TextBoxWidth" runat="server" Text="300"></asp:TextBox>高度：<asp:TextBox ID="TextBoxHeight" runat="server" Text="300"></asp:TextBox>
                        </div>
                    </div>
                    <div class="divtr"  style="line-height:40px;" >
                        <div class="divtd">
                           
                        </div>
                        <div class="divtd">
                            <asp:Button ID="ButtonGenerate" runat="server" Text="生成" OnClick="ButtonGenerate_Click" />
                        </div>
                    </div>
                    <div class="divtr"  style="line-height:120px;" >
                        <div class="divtd">
                           二维码
                        </div>
                        <div class="divtd">
                            <asp:PlaceHolder ID="PlaceHolderBarCode" runat="server" />
                        </div>
                    </div>
                </div>

把QRCoder.dll类库引入Bin目录中去：

然后在ASPX.CS引用命名空间：

using QRCoder;
using System.IO;
using System.Drawing;

 
OnClick事件：

protected void ButtonGenerate_Click(object sender, EventArgs e)
    {
        string code = this.TextBoxQRCode.Text;
        QRCodeGenerator qrGenerator = new QRCodeGenerator();
        QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q);
        System.Web.UI.WebControls.Image imageBarCode = new System.Web.UI.WebControls.Image();
        imageBarCode.Height = string.IsNullOrEmpty(this.TextBoxHeight.Text.Trim()) ? 300 : Convert.ToInt32(this.TextBoxHeight.Text.Trim());
        imageBarCode.Width = string.IsNullOrEmpty(this.TextBoxWidth.Text.Trim()) ? 300 : Convert.ToInt32(this.TextBoxWidth.Text.Trim());

        using (Bitmap bitMap = qrCode.GetGraphic(20))
        {
            using (MemoryStream ms = new MemoryStream())
            {
                bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                byte[] byteImage = ms.ToArray();
                imageBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
            }
            this.PlaceHolderBarCode.Controls.Add(imageBarCode);
        }
    }