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

原創(chuàng)|使用教程|編輯：龔雪|2016-03-21 15:05:14.000|閱讀 538 次

概述：本次教程將向您介紹如何在ASP.NET Web應用程序中輕松使用Barcode Professional SDK for .NET。

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相關鏈接：

在教程開始前您需要完成以下幾項工作：

使用Visual Studio 2008 或者 VWD 2008 Express Edition 創(chuàng)建一個ASP.NET網頁
創(chuàng)建一個簡單的ASP.NET WebForm (ASPX)來動態(tài)地生成條形碼
通過Barcode Professional SDK for .NET為條形碼生成創(chuàng)建一個ASP.NET HTTP Handler (ASHX)

操作步驟：

確定您已經安裝了Barcode Professional SDK for .NET
啟動Visual Studio 2008或者VWD 2008并創(chuàng)建一個ASP.NET網頁
添加一個到Barcode Professional SDK for .NET集合的調用
打開Default.ASPX文件并在源代碼視窗中粘貼以下內容：

<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>

在設計視窗中雙擊“Barcode Now!";按鈕并復制以下代碼到按鈕的Click事件處理器中：

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;
}

新添加一個"Generic Handler"類型的項并命名為BarcodeGen.ASHX. 在這個ASP.NET處理程序中，我們將為條形碼生成創(chuàng)建一個BarcodeProfessional類的實例。在文件創(chuàng)建后，打開并粘貼以下代碼：

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;
        }
    }
}