ASP.Net Core中的自定义类

Question

New to .NET Core I'm trying to make a custom class, that I can call from different controllers.

In the root of my project I've created a folder called Helpers. In that I've created EncryptString.cs:

namespace VPV.Helpers {
    public class EncryptString {
        public string Index(string val, string salt) {
            byte[] data = Encoding.UTF8.GetBytes(val + salt);
            data = SHA512.Create().ComputeHash(data);
            return Convert.ToBase64String(data);
        }
    }
}

But how do I call that from my controller?

I've tried something like:

public async Task<IActionResult> OnPostAsync(Guid id, string password, string passwordCheck) {
    hashedPassword = new VPV.Helpers.EncryptString [...]
}

But I'm stuck from there.

Answer 1

I think you probably wanted that to be a static call. However the better approach would be to make that helper an injectable service, but not sure if you may consider that too advanced or overkill.

I only suggested it as you indicated that it would be used by multiple controllers.

Now since you mentioned that you wanted to keep it simple and, while not the best of designs, make the method static,

namespace VPV.Helpers {    
    public static class Strings {    
        public string Encrypt(string val, string salt) {
            byte[] data = Encoding.UTF8.GetBytes(val + salt);
            data = SHA512.Create().ComputeHash(data);
            return Convert.ToBase64String(data);
        }
    }
}

and call it where needed.

public async Task<IActionResult> OnPostAsync(Guid id, string password, string passwordCheck) {
    //...

    var hashedPassword = new VPV.Helpers.Strings.Encrypt(password, salt);

    //...
}

You could also consider converting the helper to an extension method

namespace VPV.Helpers {    
    public static class Strings {    
        public string Encrypt(this string val, string salt) {
            byte[] data = Encoding.UTF8.GetBytes(val + salt);
            data = SHA512.Create().ComputeHash(data);
            return Convert.ToBase64String(data);
        }
    }
}

which would then mean that you can call it like

public async Task<IActionResult> OnPostAsync(Guid id, string password, string passwordCheck) {
    //...

    var hashedPassword = password.Encrypt(salt);

    //...
}