Unity - C#比较两个文件是否相同

℡枫叶℡2025-09-25 18:29

前言：我的情况是需要检测目标目录文件在发生变动时，将其拷贝至另一个目录

Hash比较法

复制代码

	static bool CompareFileHash(string sourcePath, string targetPath)
	{
        // 目标文件不存在，则返回不相同
		if (!File.Exists(targetPath))
			return false;

		string getHash(string filePath)
		{
			using (var md5 = MD5.Create())
			using (var stream = File.OpenRead(filePath))
			{
				byte[] hashBytes = md5.ComputeHash(stream);
				return BitConverter.ToString(hashBytes).Replace("-", "").ToLowerInvariant();
			}
		}
		var hash1 = getHash(sourcePath);
		var hash2 = getHash(targetPath);
		Debug.Log($"{sourcePath}|{hash1}\n{targetPath}|{hash2}");
		return hash1 == hash2;
	}

增加文件长度比较

复制代码

    public static bool CompareFile(string sourcePath, string targetPath)
    {
        if (!File.Exists(targetPath))
            return false;
            
        FileInfo sourceInfo = new FileInfo(sourcePath);
        FileInfo targetInfo = new FileInfo(targetPath);
        
        if (sourceInfo.Length != targetInfo.Length)
            return false;
        
        return CompareFileHash(sourcePath,targetPath);
    }