Yi.Framework.Net6/Yi.Framework.Common/Helper/MimeHelper.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Yi.Framework.Common.Helper
{
   public static  class MimeHelper
    {
        // 通过自己定义一个静态类
        // 将所有的Content Type都扔进去吧
        // 调用的时候直接调用静态方法即可。
        
            private static Hashtable _mimeMappingTable;

            private static void AddMimeMapping(string extension, string MimeType)
            {
                MimeHelper._mimeMappingTable.Add(extension, MimeType);
            }

            public static string GetMimeMapping(string FileName)
            {
                string text = null;
                int num = FileName.LastIndexOf('.');
                if (0 < num && num > FileName.LastIndexOf('\\'))
                {
                    text = (string)MimeHelper._mimeMappingTable[FileName.Substring(num)];
                }
                if (text == null)
                {
                    text = (string)MimeHelper._mimeMappingTable[".*"];
                }
                return text;
            }

            static MimeHelper()
            {
                MimeHelper._mimeMappingTable = new Hashtable(190, StringComparer.CurrentCultureIgnoreCase);
                MimeHelper.AddMimeMapping(".323", "text/h323");
                MimeHelper.AddMimeMapping(".asx", "video/x-ms-asf");
                MimeHelper.AddMimeMapping(".acx", "application/internet-property-stream");
                MimeHelper.AddMimeMapping(".ai", "application/postscript");
                MimeHelper.AddMimeMapping(".aif", "audio/x-aiff");
                MimeHelper.AddMimeMapping(".aiff", "audio/aiff");
                MimeHelper.AddMimeMapping(".axs", "application/olescript");
                MimeHelper.AddMimeMapping(".aifc", "audio/aiff");
                MimeHelper.AddMimeMapping(".asr", "video/x-ms-asf");
                MimeHelper.AddMimeMapping(".avi", "video/x-msvideo");
                MimeHelper.AddMimeMapping(".asf", "video/x-ms-asf");
                MimeHelper.AddMimeMapping(".au", "audio/basic");
                MimeHelper.AddMimeMapping(".application", "application/x-ms-application");
                MimeHelper.AddMimeMapping(".bin", "application/octet-stream");
                MimeHelper.AddMimeMapping(".bas", "text/plain");
                MimeHelper.AddMimeMapping(".bcpio", "application/x-bcpio");
                MimeHelper.AddMimeMapping(".bmp", "image/bmp");
                MimeHelper.AddMimeMapping(".cdf", "application/x-cdf");
                MimeHelper.AddMimeMapping(".cat", "application/vndms-pkiseccat");
                MimeHelper.AddMimeMapping(".crt", "application/x-x509-ca-cert");