文件上传

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public void UploadFile(object sender, System.EventArgs e) 
        { 
            
                string imgNameOnly, imgNameNoExt, imgExt; 
                string imgThumbnail; 
                int erroNumber = 0; 
                System.Drawing.Image oriImg, newImg; 
                string strFePicSavePath = ConfigurationSettings.AppSettings["FePicSavePath"].ToString(); 
                string strFePicThumbFormat = ConfigurationSettings.AppSettings["FePicThumbFormat"].ToString().ToLower(); 
                int intFeThumbWidth = Int32.Parse(ConfigurationSettings.AppSettings["FePicThumbWidth"]); 
                string fileExt; 

                StringBuilder picInfo = new StringBuilder(); 
            
            if(Page.IsValid) 
            { 
            

                for(int i = 0;i < Request.Files.Count; i++) 
                { 
                    HttpPostedFile PostedFile = Request.Files[i]; 
                    fileExt = (System.IO.Path.GetExtension(PostedFile.FileName)).ToString().ToLower(); 
                
                    imgNameOnly = System.IO.Path.GetFileName(PostedFile.FileName); 
                    if(fileExt == ".jpg" || fileExt == ".gif" || fileExt == ".png") 
                    { 

                        if(System.IO.File.Exists(strFePicSavePath + imgNameOnly) && (checkboxlistRewrite.Items[i].Selected == false)) 
                        { 
                            erroNumber = erroNumber + 1; 
                            picInfo.Append("<b>错误：</b>文件("+ (i+1) +") " + imgNameOnly + " 已经存在，请修改文件名<br>" ); 
                        } 
                    } 
                    else 
                    { 
                        erroNumber = erroNumber + 1; 
                        picInfo.Append("<b>错误：</b>文件("+ (i+1) +") " + imgNameOnly + " 扩展名 " + fileExt + " 不被许可<br>" ); 
                    }                

                } 

                if(erroNumber > 0) 
                { 
                    picInfo.Append("<font color=red>全部操作均未完成，请修改错误，再进行操作</font><br>"); 
                } 
                else            
                { 
                    for(int i = 0;i < Request.Files.Count; i++) 
                    { 
                
                        HttpPostedFile PostedFile = Request.Files[i]; 
                        imgNameOnly = System.IO.Path.GetFileName(PostedFile.FileName); 
                        imgNameNoExt = System.IO.Path.GetFileNameWithoutExtension(PostedFile.FileName); 
                        imgExt = System.IO.Path.GetExtension(PostedFile.FileName).ToString().ToLower(); 
                    
                    
                        oriImg = System.Drawing.Image.FromStream(PostedFile.InputStream); 
                        newImg = oriImg.GetThumbnailImage(intFeThumbWidth, intFeThumbWidth * oriImg.Height/oriImg.Width,null,new System.IntPtr(0)); 
                        switch(imgExt) 
                        { 
                            //case ".jpeg": 
                            case ".jpg": 
                                oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Jpeg); 
                                break; 
                            case ".gif": 
                                oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Gif); 
                                break; 
                            case ".png": 
                                oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Png); 
                                break; 
                        } 
                        
                        //oriImg.Save(ConfigurationSettings.AppSettings["FePicSavePath"] + imgNameNoExt + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg); 
                                        
                        switch(strFePicThumbFormat) 
                        { 
                                //jpeg format can get the smallest file size, and the png is the largest size 
                            //case "jpeg": 
                            case "jpg": 
                                newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.jpg",System.Drawing.Imaging.ImageFormat.Jpeg); 
                                imgThumbnail = imgNameOnly + "_thumb.jpg"; 
                                break; 
                            case "gif": 
                                newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.gif",System.Drawing.Imaging.ImageFormat.Gif); 
                                imgThumbnail = imgNameOnly + "_thumb.gif"; 
                                break; 
                            case "png": 
                                newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.png",System.Drawing.Imaging.ImageFormat.Png); 
                                imgThumbnail = imgNameOnly + "_thumb.png"; 
                                break; 
                            default: 
                                newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.jpg",System.Drawing.Imaging.ImageFormat.Jpeg); 
                                imgThumbnail = imgNameOnly + "_thumb.jpg";                        
                                break; 
                    
                        }//switch 
                        
                        picInfo.Append("<b>文件　名：</b>" + imgNameOnly + " ( " + oriImg.Width + " x " + oriImg.Height + " ) " + PostedFile.ContentLength/1024 + "KB<br>"); 
                        picInfo.Append("<b>缩略图名：</b>" + imgThumbnail + " ( " + newImg.Width + " x " + newImg.Height + " )<br><br>"); 
                    
                        oriImg.Dispose(); 
                        newImg.Dispose();                
                    
                    }//for 
                    picInfo.Append("<font color=red>所有操作成功</font><br>"); 

                }// if erronumber = 0 

            
                
            } 
            else 
            { 
                picInfo.Append("<font color=red>有错误，请检查。操作未成功</font><br>"); 

            } 

            lblPicInfo.Text = picInfo.ToString(); 

        }