Intercept AutoCrud Create/Update to trim all RequestDto's strings?

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I did not manage to get the OrmLite’s StringFilter to work.

However, after considering my options, I went with a RequestConverter for
update requests, combined with an object dictionary as suggested:

private void ConfigureRequestConverters(Container container)
{
  // trim all incoming string properties
  RequestConverters.Add((req, requestDto) => {
      if ((requestDto is IPost) || (requestDto is IPut))
      {
          var map = requestDto.ToObjectDictionary();
          var map2 = new Dictionary<string, object>();
          foreach (var kvp in map)
          {
              if (kvp.Value is string)
              {
                  var str = ((string)kvp.Value).Trim();
                  map2.Add(kvp.Key, str);
              }
          }

          // string properties trimmed?
          if (map2.Count > 0)
          {
              map2.PopulateInstance(requestDto);
          }
      }
      return Task.FromResult(requestDto);
  });
}

After testing, I think this is a better approach, because it means the trimmed strings are also used in the RequestDto validations.

Please feel free to suggest any improvements to my code or approach.

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