How do I create a wallet given a private key.

[Gavin-Williams]

There is no wallet constructor for when we have a private key. I just don't know how to proceed. I searched for Keypair, but there is no utility class for generating a keypair from a private key.

I'm guessing that you call the private key the 'seed' ? Then I would need a utility function to convert a private key into a byte[] representation of the private key.

Update: I'm going to install the Solana CLI - I bet it's got all sorts of useful tools.

[HeCoding180]

There is a method in the newest source code (Account.FromSecretKey()), but unfortunately this isn't available in the latest release (which for some reason was last updated 3 years ago :/). For example if you downloaded the packages from NuGet. However, you can still implement this function manually in your code. It's under src/Solnet.Wallet/Account.cs I have not tested it yet, but I hope this works:

public static Account FromSecretKey(string secretKey)
{
    var B58 = new Base58Encoder();
    byte[] skeyBytes = B58.DecodeData(secretKey);
    if (skeyBytes.Length != 64)
    {
        throw new ArgumentException("Not a secret key");
    }
    
    Account acc = new Account(skeyBytes, skeyBytes.AsSpan(32, 32).ToArray());
    
    return acc;
}