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  • C# 检测真实的文件类型函数

         private bool IsAllowedExtension(HttpPostedFile hifile)
            {
                bool ret = false;
    
                System.IO.FileStream fs = new System.IO.FileStream(hifile.FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                System.IO.BinaryReader r = new System.IO.BinaryReader(fs);
                string fileclass = "";
                byte buffer;
                try
                {
                    buffer = r.ReadByte();
                    fileclass = buffer.ToString();
                    buffer = r.ReadByte();
                    fileclass += buffer.ToString();
                }
                catch
                {
                    return false;
                }
                r.Close();
                fs.Close();
                /*文件扩展名说明
                 *7173        gif 
                 *255216      jpg
                 *13780       png
                 *6677        bmp
                 *239187      txt,aspx,asp,sql
                 *208207      xls.doc.ppt
                 *6063        xml
                 *6033        htm,html
                 *4742        js
                 *8075        xlsx,zip,pptx,mmap,zip
                 *8297        rar   
                 *01          accdb,mdb
                 *7790        exe,dll           
                 *5666        psd 
                 *255254      rdp 
                 *10056       bt种子 
                 *64101       bat 
                 */
    
    
                String[] fileType = { "255216", "7173", "6677", "13780", "8297", "5549", "870", "87111", "8075" };
    
                for (int i = 0; i < fileType.Length; i++)
                {
                    if (fileclass == fileType[i])
                    {
                        ret = true;
                        break;
                    }
                }
                return ret;       
            }
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  • 原文地址:https://www.cnblogs.com/qq1223558/p/3678743.html
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