static string DumpUnseenKeys(FindUnusedKeysVisitor visitor, string concat)
{
var builder = new StringBuilder();
foreach (var unseenKey in visitor.UnseenKeys())
{
if (builder.Length > 0)
builder.Append(concat);
foreach (var b in unseenKey.Key)
builder.Append(b.ToString("X2"));
builder.Append(" Value len:");
builder.Append(unseenKey.ValueSize);
}
return builder.ToString();
}