I using Umbraco from console application with ContentService. When I try use method SaveAndPublish - get error. I included source code Umbraco.Core.dll in my project. And as result I detected that error is in file ContentService.cs in next line:

var xml = content.ToXml();

Method ToXml() return error because UmbracoSettings.UseLegacyXmlSchema is null .

When I commented all next code file ContentService.cs, everything works perfectly.

/*var xml = content.ToXml();
                    //Preview Xml
                    var previewPoco = new PreviewXmlDto
                        {
                            NodeId = content.Id,
                            Timestamp = DateTime.Now,
                            VersionId = content.Version,
                            Xml = xml.ToString(SaveOptions.None)
                        };
                    var previewExists =
                        uow.Database.ExecuteScalar<int>("SELECT COUNT(nodeId) FROM cmsPreviewXml WHERE nodeId = @Id AND versionId = @Version",
                                                        new { Id = content.Id, Version = content.Version }) != 0;
                    int previewResult = previewExists
                                            ? uow.Database.Update<PreviewXmlDto>(
                                                "SET xml = @Xml, timestamp = @Timestamp WHERE nodeId = @Id AND versionId = @Version",
                                                new
                                                    {
                                                        Xml = previewPoco.Xml,
                                                        Timestamp = previewPoco.Timestamp,
                                                        Id = previewPoco.NodeId,
                                                        Version = previewPoco.VersionId
                                                    })
                                            : Convert.ToInt32(uow.Database.Insert(previewPoco));

                    if (published)
                    {
                        //Content Xml
                        var contentPoco = new ContentXmlDto { NodeId = content.Id, Xml = xml.ToString(SaveOptions.None) };
                        var contentExists = uow.Database.ExecuteScalar<int>("SELECT COUNT(nodeId) FROM cmsContentXml WHERE nodeId = @Id", new { Id = content.Id }) != 0;
                        int contentResult = contentExists
                                                ? uow.Database.Update(contentPoco)
                                                : Convert.ToInt32(uow.Database.Insert(contentPoco));

                    }*/

If I could otherwise get rid of bugs in the method .ToXml() ?

Is my solution of this error right for the console application ? (comment out code)

Why is this code in file ContentService.cs, if all work perfect without it?

Thanks.