在ASP.NET中上传图片并生成缩略图的C#源码（一）

    ÔÚASP.NETÖÐÉÏ´«Í¼Æ¬²¢Éú³ÉËõÂÔͼµÄC#Ô´Âë <FONT size=4><FONT size=4><FONT size=4>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 { /// <summary> /// Thumbnail µÄժҪ˵Ã÷¡£

    /// </summary> public class Thumbnail £º 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£©

    { // ÔÚ´Ë´¦·ÅÖÃÓû§´úÂëÒÔ³õʼ»¯Ò³ÃæLabel1.Text = "<h3>ÔÚASP.NETÀïÇáËÉʵÖËõÂÔÍ£¿lt£»/h3>"£»Button1.Text = "ÉÏÔز¢ÏÔʾËõÂÔͼ"£»

    }

    #region Web ´°ÌåÉè¼ÆÆ÷Éú³ÉµÄ´úÂëoverride protected void OnInit£¨EventArgs e£©

    { // // CODEGEN£º ¸Ãµ÷ÓÃÊÇ ASP.NET Web ´°ÌåÉè¼ÆÆ÷Ëù±ØÐèµÄ¡£

    // InitializeComponent£¨£©£»base.OnInit£¨e£©£»}

    /// <summary> /// Éè¼ÆÆ÷Ö§³ÖËùÐèµÄ·½·¨ - ²»ÒªÊ¹ÓôúÂë±à¼­Æ÷ÐÞ¸Ä/// ´Ë·½·¨µÄÄÚÈÝ¡£

    /// </summary> 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"£© < 0£©

    { Response.Write£¨"ÎÞЧµÄͼÐθñʽ¡£"£©£»return£»} GetThumbNail£¨MyPostedFile.FileName£¬ 100£¬ 100£¬MyPostedFile.ContentType.ToString£¨£©£¬ false£¬ MyPostedFile.InputStream£©£»} private System.Drawing.Imaging.ImageFormat GetImageType£¨object strContentType£©

    { if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/pjpeg"£©

    { return System.Drawing.Imaging.ImageFormat.Jpeg£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/gif"£©

    { return System.Drawing.Imaging.ImageFormat.Gif£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/bmp"£©

    { return System.Drawing.Imaging.ImageFormat.Bmp£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/tiff"£©

    { return System.Drawing.Imaging.ImageFormat.Tiff£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/x-icon"£©

    { return System.Drawing.Imaging.ImageFormat.Icon£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/x-png"£©

    { return System.Drawing.Imaging.ImageFormat.Png£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/x-emf"£©

    { return System.Drawing.Imaging.ImageFormat.Emf£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/x-exif"£©

    { return System.Drawing.Imaging.ImageFormat.Exif£»} else if £¨£¨strContentType.ToString£¨£©¡£ToLower£¨£©£© == "image/x-wmf"£©

    { return System.Drawing.Imaging.ImageFormat.Wmf£»} else { return System.Drawing.Imaging.ImageFormat.MemoryBmp£»}

    private void GetThumbNail£¨string strFileName£¬ int iWidth£¬ int iheight£¬string strContentType£¬ bool blnGetFromFile£¬ System.IO.Stream ImgStream£©

    { System.Drawing.Image oImg£»

    if £¨blnGetFromFile£©

    { oImg = System.Drawing.Image.FromFile£¨strFileName£©£»} else { oImg = System.Drawing.Image.FromStream£¨ImgStream£©£»} oImg = oImg.GetThumbnailImage£¨iWidth£¬ iheight£¬ null£¬ IntPtr.Zero£©£»string strGuid = System.Guid.NewGuid£¨£©¡£ToString£¨£©¡£ToUpper£¨£©£»string strFileExt = strFileName.Substring£¨strFileName.LastIndexOf£¨"."£©£©£»Response.ContentType = strContentType£»MemoryStream MemStream = new MemoryStream£¨£©£»oImg.Save£¨MemStream£¬ GetImageType£¨strContentType£©£©£»MemStream.WriteTo£¨Response.OutputStream£©£»}

    } </FONT></FONT></FONT><FONT color=#ff0000 size=4></FONT><FONT size=4>¹¦ÄÜ£º1.°ÑͼƬÎļþ£¨JPG GIF PNG£©ÉÏ´«£¬2.±£´æµ½Ö¸¶¨µÄ·¾¶£¨ÔÚweb.configÖÐÉèÖ÷¾¶£¬ÒÔÎļþµÄÔ­Óиñʽ±£´æ£©£¬3.²¢×Ô¶¯Éú³ÉÖ¸¶¨¿í¶ÈµÄ£¨ÔÚweb.configÖÐÉèÖÿí¶È£©

    4.ºÍÖ¸¶¨¸ñʽµÄ£¨ÔÚweb.configÖÐÖ¸¶¨ËõÂÔͼµÄ¸ñʽ£©

    5.ºÍԭͼ±ÈÀýÏàͬµÄËõÂÔͼ£¨¸ù¾Ý¿í¶ÈºÍԭͼµÄ¿íºÍ¸ß¼ÆËãËùÂÔͼµÄ¸ß¶È£©

    6.¿ÉÒÔÅжÏÊÇ·ñÒѾ­´æÔÚÎļþ7.Èç¹û²»¸²¸Ç£¬Ôò¸ø³ö´íÎó8.Èç¹ûÑ¡ÖÐ"¸²¸Çԭͼ"checkbox£¬Ôò¸²¸Çԭͼ¡£

    9.¿ÉÒÔ¸ù¾ÝÒªÇó£¬ÔÚwebformÉÏÉèÖÃ1¸öÒÔÉϵÄfile inputºÍÏàÓ¦µÄcheckbox 10.²¢ÔÚÎļþÉÏ´«Íê±Ïºó£¬ÏÔʾԭͼµÄÎļþÃû£¬³ß´ç£¬×Ö½Ú£¬ºÍ11.ËõÂÔͼµÄÎļþÃû³ß´ç¡£

    12.ËõÂÔͼµÄÎļþÃû¸ñʽ£ºÔ­Í¼+"_thumb."+Ö¸¶¨¸ñʽ£¬È磺test.jpg_thumb.gif£¬ÒÔ±ãÓÚ¹ÜÀí¡£

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