Add an object reference for a non static field

Question

1.00/5 (1 vote)

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I get this error:
"An object reference is required for the non-static field, method, or property 'HashAlgorithm.ComputeHash(byte[])'"

on this code:

C#

protected void Button1_Click(object sender, EventArgs e)

    {

        HashAlgorithm.Create("SHA512");
        byte[] hash = HashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(PIN_Entry.Text));
        string MyHash = System.BitConverter.ToString(hash);
        MessageBox.Show(MyHash.Replace(" ", ""));
    }

What I have tried:

tried all the built in potential fixes within Visual Studio but they just bring over errors. I am just not sure how to add the object reference that Visual Studio complains about. I just add characters to a TextBox then click a button to hash that text. Any ideas would be appreciated. the message box line is just for testing purposes and will be removed in the final code.

Posted 10-Feb-22 9:33am

Michaelred54

Updated 10-Feb-22 10:19am

PIEBALDconsult

v2

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2 solutions

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Tony Hill · Accepted Answer · 2022-02-10T09:43:00

Solution 1

Try this

HashAlgorithm myHashAlgorithm = HashAlgorithm.Create("SHA512");
byte[] hash = myHashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(PIN_Entry.Text));
string MyHash = System.BitConverter.ToString(hash);
MessageBox.Show(MyHash.Replace(" ", ""));

Posted 10-Feb-22 9:43am

Tony Hill

Updated 10-Feb-22 9:45am

v2

Comments

Michaelred54 11-Feb-22 7:26am

Thank you. That did it. I feel like I should have known that. I always appreciate your time.

M Imran Ansari · Accepted Answer · 2022-02-10T09:54:00

Solution 2

In order to use a non-static field, method, or property, you must first create an object of an instance.

HashAlgorithm hashAlgo = HashAlgorithm.Create("SHA512");

Now use the object hashAlgo to call their methods. Reference for more information:
Compiler Error CS0120 | Microsoft Docs[^]

Posted 10-Feb-22 9:54am

M Imran Ansari

Comments

Michaelred54 11-Feb-22 7:28am

Thank you for your comment. This will work as well.

M Imran Ansari 11-Feb-22 7:42am

Pleasure. Happy Coding!!