Conris.Utility/ImageHelper.cs

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using System;
using System.Collections.Generic;
using System.Text;

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Web.UI;
using System.Web;

namespace Conris.Utility
{
    /// <summary>
    /// 图片处理类
    /// </summary>
    public static class ImageHelper
    {
        /// <summary>
        /// 获取图像编码解码器的所有相关信息
        /// </summary>
        /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>
        /// <returns>返回图像编码解码器的所有相关信息</returns>
        private static ImageCodecInfo GetCodecInfo(string mimeType)
        {
            ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
            foreach (ImageCodecInfo ici in CodecInfo)
            {
                if (ici.MimeType == mimeType) return ici;
            }
            return null;
        }

        public static ImageFormat GetImageFormat(string fileType)
        {
            switch (fileType.ToLower())
            {
                case "image/pjpeg":
                    return ImageFormat.Jpeg;
                case "image/gif":
                    return ImageFormat.Gif;
                case "image/bmp":
                    return ImageFormat.Bmp;
                case "image/tiff":
                    return ImageFormat.Tiff;
                case "image/x-icon":
                    return ImageFormat.Icon;
                case "image/x-png":
                    return ImageFormat.Png;
                case "image/x-emf":
                    return ImageFormat.Emf;
                case "image/x-exif":
                    return ImageFormat.Exif;
                case "image/x-wmf":
                    return ImageFormat.Wmf;
                default:
                    return ImageFormat.MemoryBmp;
            }
        }