在ASP.NET里轻松实现缩略图

作者：孟宪会出自：【孟宪会之精彩世界】发布日期：2003年5月23日 8点26分35秒

以前，在页面上实现缩略图必须借助第三方组件。现在，有了.NET，就可以很轻松地实现缩略图。下面就是实现缩略图的例子。

查看例子

代码如下：Thumbnail.aspx

在ASP.NET里轻松实现缩略图

后代码：Thumbnail.aspx.vb

Imports System

Imports System.Web

Imports System.Drawing

Imports System.IO

Imports System.Drawing.Imaging

Public Class Thumbnail

Inherits System.Web.UI.Page

Protected WithEvents Label1 As System.Web.UI.WebControls.Label

Protected WithEvents Button1 As System.Web.UI.WebControls.Button

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.

Private Sub InitializeComponent()

End Sub

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init

'CODEGEN: This method call is required by the Web Form Designer

'Do not modify it using the code editor.

InitializeComponent()

End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Label1.Text = "在ASP.NET里轻松实现缩略图"

Button1.Text = "上载并显示缩略图"

End Sub

Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim MyFileColl As HttpFileCollection = HttpContext.Current.Request.Files

Dim MyPostedFile As HttpPostedFile = MyFileColl.Item(0)

If LCase(MyPostedFile.ContentType.ToString()).IndexOf("image")

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Drawing.Imaging;

namespace eMeng.Exam

{

///

/// Thumbnail 的摘要说明。

///

public class Thumbnail : System.Web.UI.Page

{

protected System.Web.UI.WebControls.Label Label1;

protected System.Web.UI.WebControls.Button Button1;

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

Label1.Text = "在ASP.NET里轻松实现缩略图";

Button1.Text = "上载并显示缩略图";

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

InitializeComponent();

base.OnInit(e);

}

///

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

///

private void InitializeComponent()

{

this.Button1.Click += new System.EventHandler(this.Button1_Click);

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

private void Button1_Click(object sender, System.EventArgs e)

{

HttpFileCollection MyFileColl = HttpContext.Current.Request.Files;

HttpPostedFile MyPostedFile = MyFileColl[0];

if (MyPostedFile.ContentType.ToString().ToLower().IndexOf("image")