public Task <IAsyncCollector <string> > ConvertAsync(KeyVaultSecretAttribute input, CancellationToken cancellationToken) => Task.FromResult(new KeyVaultCollector(input) as IAsyncCollector <string>);
 public KeyVaultCollector(KeyVaultSecretAttribute attrib) => _attrib = attrib;
 public KeyVaultCollector(KeyVaultSecretAttribute attrib)
 {
     this._attrib = attrib;
 }