SHA-1 Byte array hash against file stream

Question

I am writing an API that allows users to upload files (image, video, etc.). I use the SHA-1 hash to make sure that the same file does not load multiple times. We used to allow fewer files, so I read them into a byte array and hashed, but now we allow large files, so I use a file stream. The problem is that the SHA-1 algorithm returns another hash. I need to figure out how to get the same hash regardless of method, even if I need to turn an array of bytes into a file stream or something like that. However, I tried writing a byte array to the temp file and reading it, and it returns the same hash as the byte array. Here is an example console application that shows what I'm doing:

static void Main(string[] args)
{
    string file = "C:\\CUWCDFileStorage\\temp\\test.png";
    var bytes = File.ReadAllBytes(file);
    using (var stream = File.Open(file, FileMode.Open))
    {
        Console.WriteLine(Sha1HashFile(bytes));   // Returns B7F6D90C30233F91FCEFE05FB49679F8B26C9D80
        Console.WriteLine(Sha1HashFile(stream));  // Returns DA39A3EE5E6B4B0D3255BFEF95601890AFD80709
        Console.WriteLine(Sha1HashFile2(bytes));  // Returns B7F6D90C30233F91FCEFE05FB49679F8B26C9D80
    }

    Console.Read();
}

public static string Sha1HashFile(byte[] file)
{
    using (SHA1Managed sha1 = new SHA1Managed())
    {
        return BitConverter.ToString(sha1.ComputeHash(file)).Replace("-", "");
    }
}

public static string Sha1HashFile(Stream stream)
{
    using (SHA1Managed sha1 = new SHA1Managed())
    {
        return BitConverter.ToString(sha1.ComputeHash(stream)).Replace("-", "");
    }
}

public static string Sha1HashFile2(byte[] bytes)
{
    string file = "C:\\CUWCDFileStorage\\temp\\test2.png";
    File.WriteAllBytes(file, bytes);
    return Sha1HashFile(File.OpenRead(file));
}

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EDIT:

, , MD5 . , :

static void Main(string[] args)
{
    string file = "C:\\CUWCDFileStorage\\temp\\test.png";
    var bytes = File.ReadAllBytes(file);
    using (var stream = File.Open(file, FileMode.Open))
    {
        Console.WriteLine(Md5HashFile(bytes));
        Console.WriteLine(Md5HashFile(stream));
        Console.WriteLine(Sha1HashFile(bytes));
        Console.WriteLine(Sha1HashFile(stream));
        Console.WriteLine(Sha1HashFile2(bytes));
    }

    Console.Read();
}

public static string Md5HashFile(byte[] file)
{
    using (MD5 md5 = MD5.Create())
    {
        return BitConverter.ToString(md5.ComputeHash(file)).Replace("-", "");
    }
}

public static string Sha1HashFile(byte[] file)
{
    using (SHA1Managed sha1 = new SHA1Managed())
    {
        return BitConverter.ToString(sha1.ComputeHash(file)).Replace("-", "");
    }
}

public static string Md5HashFile(Stream stream)
{
    using (MD5 md5 = MD5.Create())
    {
        return BitConverter.ToString(md5.ComputeHash(stream)).Replace("-", "");
    }
}

public static string Sha1HashFile(Stream stream)
{
    using (SHA1Managed sha1 = new SHA1Managed())
    {
        return BitConverter.ToString(sha1.ComputeHash(stream)).Replace("-", "");
    }
}

public static string Sha1HashFile2(byte[] bytes)
{
    string file = "C:\\CUWCDFileStorage\\temp\\test2.png";
    File.WriteAllBytes(file, bytes);
    return Sha1HashFile(File.OpenRead(file));
}

. .

Answer 1

, . . - , , . :

static void Main(string[] args)
{
    string file = "C:\\CUWCDFileStorage\\temp\\test.png";
    var bytes = File.ReadAllBytes(file);
    using (var stream = File.Open(file, FileMode.Open))
    {
        Console.WriteLine(Md5HashFile(bytes));
        Console.WriteLine(Md5HashFile(stream));
    }

    using (var stream = File.Open(file, FileMode.Open))
    {
        Console.WriteLine(Sha1HashFile(bytes));
        Console.WriteLine(Sha1HashFile(stream));
        Console.WriteLine(Sha1HashFile2(bytes));
    }

    Console.Read();
}

public static string Md5HashFile(byte[] file)
{
    using (MD5 md5 = MD5.Create())
    {
        return BitConverter.ToString(md5.ComputeHash(file)).Replace("-", "");
    }
}

public static string Sha1HashFile(byte[] file)
{
    using (SHA1Managed sha1 = new SHA1Managed())
    {
        return BitConverter.ToString(sha1.ComputeHash(file)).Replace("-", "");
    }
}

public static string Md5HashFile(Stream stream)
{
    using (MD5 md5 = MD5.Create())
    {
        return BitConverter.ToString(md5.ComputeHash(stream)).Replace("-", "");
    }
}

public static string Sha1HashFile(Stream stream)
{
    using (SHA1Managed sha1 = new SHA1Managed())
    {
        return BitConverter.ToString(sha1.ComputeHash(stream)).Replace("-", "");
    }
}

public static string Sha1HashFile2(byte[] bytes)
{
    string file = "C:\\CUWCDFileStorage\\temp\\test2.png";
    File.WriteAllBytes(file, bytes);
    return Sha1HashFile(File.OpenRead(file));
}