Barcode Professional SDK for .NET使用教程（五）：在Web应用程序中使用Barcode Professional-控件新闻-慧都网

Barcode Professional SDK for .NET使用教程（五）：在Web应用程序中使用Barcode Professional

原创|使用教程|编辑：龚雪|2016-03-21 15:05:14.000|阅读 461 次

概述：本次教程将向您介绍如何在ASP.NET Web应用程序中轻松使用Barcode Professional SDK for .NET。

在教程开始前您需要完成以下几项工作：

使用Visual Studio 2008 或者 VWD 2008 Express Edition 创建一个ASP.NET网页
创建一个简单的ASP.NET WebForm (ASPX)来动态地生成条形码
通过Barcode Professional SDK for .NET为条形码生成创建一个ASP.NET HTTP Handler (ASHX)

操作步骤：

确定您已经安装了Barcode Professional SDK for .NET
启动Visual Studio 2008或者VWD 2008并创建一个ASP.NET网页
添加一个到Barcode Professional SDK for .NET集合的调用
打开Default.ASPX文件并在源代码视窗中粘贴以下内容：

<html xmlns="//www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Barcode Professional SDK in ASP.NET</title>
    <style type="text/css">
        .newStyle1 {
            font-family: arial, Helvetica, sans-serif;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
        <div class="newStyle1">
            <h3>Barcode Professional SDK in ASP.NET</h3>
            <br />
            Enter Value to Encode:
            <br />
            <asp:TextBox ID="TextBox1" runat="server" Width="264px">
            </asp:TextBox><asp:Button ID="Button1" runat="server" Text="Barcode Now!" 
                onclick="Button1_Click" />
            <br />
            <br />
            <asp:Image ID="Image1" runat="server" Visible="false" />
        </div>    
    </form>
</body>
</html>

在设计视窗中双击“Barcode Now!"按钮并复制以下代码到按钮的Click事件处理器中：

VB

If (Me.TextBox1.Text.Length > 0) Then
    Me.Image1.ImageUrl = "~/BarcodeGen.ashx?code=" + Me.TextBox1.Text
    Me.Image1.Visible = True
End If

C#

if (this.TextBox1.Text.Length >  0)
{
    this.Image1.ImageUrl = "~/BarcodeGen.ashx?code=" + this.TextBox1.Text;
    this.Image1.Visible = true;
}

新添加一个"Generic Handler"类型的项并命名为BarcodeGen.ASHX. 在这个ASP.NET处理程序中，我们将为条形码生成创建一个BarcodeProfessional类的实例。在文件创建后，打开并粘贴以下代码：

VB

<%@ WebHandler Language="VB" Class="BarcodeGen" %>

Imports System
Imports System.Web

Imports Neodynamic.SDK

Public Class BarcodeGen : Implements IHttpHandler
    
    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        
        'Get value to encode from querystring
        Dim valueToEncode As String = context.Request("code")
                
        'Create BarcodeProfessional object        
        Dim bc As New BarcodeProfessional()
        'Set barcode standard
        bc.Symbology = Symbology.Code128
        'Set value to encode
        bc.Code = valueToEncode

        'Generate barcode        
        context.Response.ContentType = "image/gif"
        context.Response.BinaryWrite(bc.GetBarcodeImage(System.Drawing.Imaging.ImageFormat.Gif))
    End Sub
 
    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

End Class

C#

<%@ WebHandler Language="C#" Class="BarcodeGen" %>

using System;
using System.Web;

using Neodynamic.SDK;

public class BarcodeGen : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {

        //Get value to encode from querystring
        string valueToEncode = context.Request["code"];
        
        //Create BarcodeProfessional object        
        BarcodeProfessional bc = new BarcodeProfessional();
        //Set barcode standard
        bc.Symbology = Symbology.Code128;
        //Set value to encode
        bc.Code = valueToEncode;

        //Generate barcode        
        context.Response.ContentType = "image/gif";
        context.Response.BinaryWrite(bc.GetBarcodeImage(System.Drawing.Imaging.ImageFormat.Gif));
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }
}