/// <summary>
/// 获取一个文件的Hash值
/// </summary>
/// <param name="filePath">要计算Hash值的文件</param>
/// <param name="hashType">HashType[默认值:SHA1Managed]</param>
/// <returns>所得Hash值</returns>
public static string GetFileHash(string filePath, MD5HashType hashType = MD5HashType.SHA1Managed)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException(string.Empty, filePath);
}
try
{
using (HashAlgorithm entry = HashEx.CreateHashEntry(hashType))
{
using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
//计算指定Stream 对象的哈希值
var arrbytHashValue = entry.ComputeHash(fileStream);
//由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如“F-2C-4A”
var md5HashValue = BitConverter.ToString(arrbytHashValue);
//替换-为string.Empty(去年-)
md5HashValue = md5HashValue.Replace("-", string.Empty);
return(md5HashValue);
}
}
}
catch (System.Exception ex)
{
throw new Exception("获取文件的Hash值失败", ex);
}
}
/// <summary>
/// 获取二进制数据的Hash值
/// </summary>
/// <param name="data">要计算Hash值0的二进制数据</param>
/// <param name="offset">字节数据中的偏移量,从该位置起使用数据</param>
/// <param name="count">数组中用途数据的字节数</param>
/// <param name="hashType">HashType[默认值:SHA1Managed]</param>
/// <returns>所得Hash值</returns>
public static string GetHash(byte[] data, int offset, int count, MD5HashType hashType = MD5HashType.SHA1Managed)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
using (HashAlgorithm entry = HashEx.CreateHashEntry(hashType))
{
//计算指定Stream 对象的哈希值
var arrbytHashValue = entry.ComputeHash(data, offset, count);
//由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如“F-2C-4A”
var md5HashValue = BitConverter.ToString(arrbytHashValue);
//替换-为string.Empty(去年-)
md5HashValue = md5HashValue.Replace("-", string.Empty);
return(md5HashValue);
}
}
