Microsoft.Alm.Authentication.NativeMethods.CredFree C# (CSharp) Method

        internal static extern void CredFree(IntPtr credential);

        public IEnumerable <SecureData> EnumerateSecureData(string prefix)
        {
            string filter = prefix ?? string.Empty + "*";

            if (NativeMethods.CredEnumerate(filter, 0, out int count, out IntPtr credentialArrayPtr))
            {
                Trace.WriteLine($"{count} credentials enumerated from secret store.");

                try
                {
                    for (int i = 0; i < count; i += 1)
                    {
                        int    offset        = i * Marshal.SizeOf(typeof(IntPtr));
                        IntPtr credentialPtr = Marshal.ReadIntPtr(credentialArrayPtr, offset);

                        if (credentialPtr != IntPtr.Zero)
                        {
                            NativeMethods.Credential credStruct = Marshal.PtrToStructure <NativeMethods.Credential>(credentialPtr);
                            int passwordLength = credStruct.CredentialBlobSize;

                            byte[] data = new byte[credStruct.CredentialBlobSize];
                            Marshal.Copy(credStruct.CredentialBlob, data, 0, credStruct.CredentialBlobSize);

                            string name = credStruct.UserName ?? string.Empty;
                            string key  = credStruct.TargetName;

                            yield return(new SecureData(key, name, data));
                        }
                    }
                }
                finally
                {
                    NativeMethods.CredFree(credentialArrayPtr);
                }
            }