判断上传文件类型代码,CSharp代码库,德仔网

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【CSharp】判断上传文件类型

作者:dezai / 发布于2014/4/3/ 516


public static bool IsAllowedExtension(FileUpload hifile)
{
System.IO.FileStream fs = new System.IO.FileStream(hifile.PostedFile.FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
System.IO.BinaryReader r = new System.IO.BinaryReader(fs);
string fileclass = "";
//这里的位长要具体判断.
byte buffer;
try
{
buffer = r.ReadByte();
fileclass = buffer.ToString();
buffer = r.ReadByte();
fileclass += buffer.ToString();

}
catch
{

}
r.Close();
fs.Close();
if (fileclass == "255216" || fileclass == "7173")//说明255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar
{
return true;
}
else
{
return false;
}

}





JPG = 255216,
GIF = 7173,
BMP = 6677,
PNG = 13780,
SWF = 6787,
RAR = 8297,
ZIP = 8075,
7Z = 55122,
TXT = 102100,
PDF = 3780,
DOC = 208207,
XLSX = 8075,
XLS = 207208,
CHM = 7384
XML = 6063,
HTML = 6033,
ASPX = 239187,
CS = 117115,
JS = 119105,
SQL = 255254

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