C#文件MD5和SHA1值的类

public class MD5
    {
        public MD5()
        {
            
        }

        private static byte[] ConvertStringToByteArray(string data)
        {
            return(new System.Text.UnicodeEncoding()).GetBytes(data);
        }

        private static System.IO.FileStream GetFileStream(string pathName)
        {
            return(new System.IO.FileStream(pathName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite));
        }

        public static string GetSHA1Hash(string pathName)
        {
            string strResult = "";
            string strHashData = "";

            byte[] arrbytHashValue;
            System.IO.FileStream oFileStream = null;

            System.Security.Cryptography.SHA1CryptoServiceProvider oSHA1Hasher = new System.Security.Cryptography.SHA1CryptoServiceProvider();

            try
            {
                oFileStream = GetFileStream(pathName);
                arrbytHashValue = oSHA1Hasher.ComputeHash(oFileStream);
                oFileStream.Close();

                strHashData = System.BitConverter.ToString(arrbytHashValue);
                strHashData = strHashData.Replace("-", "");
                strResult = strHashData;
            }
            catch(System.Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message, "Error!", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error, System.Windows.Forms.MessageBoxDefaultButton.Button1);
            }

            return(strResult);
        }

        public static string GetMD5Hash(string pathName)
        {
            string strResult = "";
            string strHashData = "";

            byte[] arrbytHashValue;
            System.IO.FileStream oFileStream = null;

            System.Security.Cryptography.MD5CryptoServiceProvider oMD5Hasher = new System.Security.Cryptography.MD5CryptoServiceProvider();

            try
            {
                oFileStream = GetFileStream(pathName);
                arrbytHashValue = oMD5Hasher.ComputeHash(oFileStream);
                oFileStream.Close();

                strHashData = System.BitConverter.ToString(arrbytHashValue);
                strHashData = strHashData.Replace("-", "");
                strResult = strHashData;
            }
            catch(System.Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message, "Error!", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error, System.Windows.Forms.MessageBoxDefaultButton.Button1);
            }

            return(strResult);
        }

    }

使用方法：

MD5.GetMD5Hash(textBox1.Text);

textBox1中为文件的路径