C#.Net 上传图片,限制图片大小,检查类型完整版.doc

转】C#.Net 上传图片,限制图片大小,检查类型完整版1.缩小图片：public class CImageLibrary public enum ValidateImageResult OK, InvalidFileSize, InvalidImageSize /检查图片大小 public static ValidateImageResult ValidateImage(string file, int MAX_FILE_SIZE, int MAX_WIDTH, int MAX_HEIGHT) byte bs = File.ReadAllBytes(file); double size = (bs.Length / 1024); /大于50KB if (size MAX_FILE_SIZE) return ValidateImageResult.InvalidFileSize; Image img = Image.FromFile(file); if (img.Width MAX_WIDTH | img.Height MAX_HEIGHT) return ValidateImageResult.InvalidImageSize; return ValidateImageResult.OK; /按宽度比例缩小图片 public static Image GetOutputSizeImage(Image imgSource, int MAX_WIDTH) Image imgOutput = imgSource; Size size = new Size(imgSource.Width, imgSource.Height); if (imgSource.Width = 3 | imgSource.Height MAX_WIDTH | imgSource.Height MAX_WIDTH) double rate = MAX_WIDTH / (double)imgSource.Width; if (imgSource.Height * rate MAX_WIDTH) rate = MAX_WIDTH / (double)imgSource.Height; size.Width = Convert.ToInt32(imgSource.Width * rate); size.Height = Convert.ToInt32(imgSource.Height * rate); imgOutput = imgSource.GetThumbnailImage(size.Width, size.Height, null, IntPtr.Zero); return imgOutput; /按比例缩小图片 public static Image GetOutputSizeImage(Image imgSource, Size outSize) Image imgOutput = imgSource.GetThumbnailImage(outSize.Width, outSize.Height, null, IntPtr.Zero); return imgOutput; public static byte GetImageBytes(string imageFileName) Image img = Image.FromFile(imageFileName); return GetImageBytes(img); public static byte GetImageBytes(Image img) if (img = null) return null; try System.IO.MemoryStream ms = new MemoryStream(); img.Save(ms, ImageFormat.Jpeg); byte bs = ms.ToArray(); ms.Close(); return bs; catch return null; public static Image FromBytes(byte bs) if (bs = null) return null; try MemoryStream ms = new MemoryStream(bs); Image returnImage = Image.FromStream(ms); ms.Close(); return returnImage; catch return null; 2.自定义类：public class CFileUpload private FileUpload _fileUpload; private string _savePath; private string _LastUploadedFile = string.Empty; private bool _AutoGenFileName = false; public string LastUploadedFile get return _LastUploadedFile; private string PICTURE_FILE = .gif.png.jpeg.jpg.bmp; private string ZIP_FILE = .zip.rar; private string MUILT_MEDIA_FILE = .mpeg.mpg.fla.exe.wma; private int IMG_MAX_WIDTH = 0;/未指定宽度 private int IMG_MAX_HEIGHT = 0;/未指定高度 / / 构造器 / / A FileUpload对象 / 保存目录，不包含文件名 / 自动生成文件名 public CFileUpload(FileUpload fileUpload, string savePath, bool autoGenFileName) _savePath = savePath; _fileUpload = fileUpload; _AutoGenFileName = autoGenFileName; / / 构造器 / / A FileUpload对象 / 保存目录，不包含文件名 public CFileUpload(FileUpload fileUpload, string savePath) _savePath = savePath; _fileUpload = fileUpload; / / 上传RAR文件 / public bool UploadRARFile() return DoUpload(ZIP_FILE); / / 上传视频文件 / public bool UploadVideo() return DoUpload(MUILT_MEDIA_FILE); / / 上传图片文件 / public bool UploadImage() return DoUpload(PICTURE_FILE); public bool UploadImage(int maxWidth, int maxHeight) this.IMG_MAX_WIDTH = maxWidth; this.IMG_MAX_HEIGHT = maxHeight; return DoUpload(PICTURE_FILE); / / 上传任何支持的文件 / public bool UploadAnySupported() return DoUpload(PICTURE_FILE + ZIP_FILE + MUILT_MEDIA_FILE); / / 生成新的文件名 / private string GetNewFileName(string folder, string fileName) /_AutoGenFileName=true 或者文件名长度50,自动生成32位GUID文件名 if (_AutoGenFileName | StrUtils.GetStringLength(fileName) = 50) string ext = System.IO.Path.GetExtension(fileName); string newfile = Guid.NewGuid().ToString().Replace(-, ) + ext; return folder + newfile; else if (System.IO.File.Exists(folder + fileName) string ext = System.IO.Path.GetExtension(fileName); string filebody = fileName.Replace(ext, ); int x = 1; while (true) /如果文件存在，生成尾部带(x)的文件 string newfile = folder + filebody + ( + x.ToString() + ) + ext; if (!System.IO.File.Exists(newfile) return folder + filebody + ( + x.ToString() + ) + ext; else x+; else return folder + fileName; / / 最大支持小于1MB的文件。 / private bool AllowMaxSize(int fileLength) int MAX_SIZE_UPLOAD = 1024;/最大支持上传小于1MB的文件。 double kb = fileLength / 1024; return (int)kb 0; /检查上传文件大小 fileOK = fileOK & AllowMaxSize(_fileUpload.FileBytes.Length); if (!fileOK) return false; /如检查不通过，退出 try / 文件另存在服务器指定目录下 string savefile = GetNewFileName(_savePath, _fileUpload.FileName); if (IsUploadImage(fileExtension)/保存图片 System.Drawing.Image output = CImageLibrary.FromBytes(_fileUpload.FileBytes); / 检查图片宽度/高度/大小 if (this.IMG_MAX_WIDTH != 0 & output.Width this.IMG_MAX_WIDTH) output = CImageLibrary.GetOutputSizeImage(output, this.IMG_MAX_WIDTH); Bitmap bmp = new Bitmap(output); bmp.Save(savefile, output.RawFormat); else/其它任何文件 _fileUpload.PostedFile.SaveAs(savefile); _LastUploadedFile = savefile; return true; catch return false; private bool IsUploadImage(string fileExtension) bool isImage = PICTURE_FILE.IndexOf(fileExtension) 0; return isImage; 3.事件：protected void btnUploadImg_Click(object sender, EventArgs e) try if (!FileUploadImg.HasFile) return; string virtualFilePath = / + CAppConfiguration.Current.BbsUploadFilePath; string savePath = this.Server.MapPath(virtualFilePath); /保存文件物理路径 /调用CFileUpload类 CFileUpload upload = new CFileUpload(FileUploadImg, savePath, false); /上传图片文件 bool ret = upload.UploadImage(); if (ret) string filename = System.IO.Path.GetFileName(upload.LastUploadedFile); string imgHTML = ; this.hfLastUploadImage.Value = filename; string root = CGlobals.GetHttpRoot(this); imgHTML = string.Format(imgHTML, root + / + CAppConfiguration.Current.BbsUploadFilePath + filename); FreeTextBox