C# 获取文件的信息摘要

/// <summary>
/// 获取文件的信息摘要
/// SHA256
/// </summary>
/// <param name="aPath"></param>
/// <returns></returns>
public static string GetSHA256(string aPath) {
		using (SHA256 bSHA256 = SHA256.Create())
		{
			//获取文件
			FileStream bFileStream = File.OpenRead(aPath);
			// 确保它位于流的开头。
			bFileStream.Position = 0;
			//计算fileStream的hash。
			byte[] bValue = bSHA256.ComputeHash(bFileStream);
			//关闭文件
			bFileStream.Close();
			return Byte2Str(bValue);
		}
}

/// <summary>
/// 获取文件信息摘要
/// SHA512
/// </summary>
/// <param name="aPath"></param>
/// <returns></returns>
public static string GetSHA512(string aPath)
{
		using (SHA512 bSHA512 = SHA512.Create())
		{
			//获取文件
			FileStream bFileStream = File.OpenRead(aPath);
			// 确保它位于流的开头。
			bFileStream.Position = 0;
			//计算fileStream的hash。
			byte[] bValue = bSHA512.ComputeHash(bFileStream);
			//关闭文件
			bFileStream.Close();
			return Byte2Str(bValue);
		}
}

/// <summary>
/// 二进制转字符串
/// </summary>
/// <param name="aValue"></param>
/// <returns></returns>
private static string Byte2Str(byte[] aValue)
{
		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < aValue.Length; i++)
		{
			builder.Append($"{aValue[i]:X2}");
		}

		return builder.ToString();
}