您正在看的.Net是:在ASP.NET中上传图片并生成缩略图的C#源码。 在ASP.NET中上传图片并生成缩略图的C#源码 <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 的摘要说明。 /// </summary> 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 = <h3>在ASP.NET里轻松实炙趼酝?lt;/h3>; 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); } /// <summary> /// 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。 /// </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(无效的图形格式。); 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(strF