ImageUpload.cs

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using System;
using System.IO;
using System.Web;
using System.Web.UI.HtmlControls;
using System.Drawing;

/// <summary>
/// 文件类型
/// </summary>
public enum FileExtension
{
    JPG = 255216,
    GIF = 7173,
    BMP = 6677,
    PNG = 13780,
    RAR = 8297,
    jpg = 255216,
    exe = 7790,
    xml = 6063,
    html = 6033,
    aspx = 239187,
    cs = 117115,
    js = 119105,
    txt = 210187,
    sql = 255254
}

/// <summary>
/// 图片检测类
/// </summary>
public static class FileValidation
{
    #region 上传图片检测类
    /// <summary>
    /// 是否允许
    /// </summary>
    public static bool IsAllowedExtension(HttpPostedFile oFile, FileExtension[] fileEx)
    {
        int fileLen = oFile.ContentLength;
        byte[] imgArray = new byte[fileLen];
        oFile.InputStream.Read(imgArray, 0, fileLen);
        MemoryStream ms = new MemoryStream(imgArray);
        System.IO.BinaryReader br = new System.IO.BinaryReader(ms);
        string fileclass = "";
        byte buffer;
        try
        {
            buffer = br.ReadByte();
            fileclass = buffer.ToString();
            buffer = br.ReadByte();
            fileclass += buffer.ToString();
        }
        catch { }
        br.Close();
        ms.Close();
        foreach (FileExtension fe in fileEx)
        {
            if (Int32.Parse(fileclass) == (int)fe) return true;
        }
        return false;