added dxfreader feat

src/ACadSharp.Tests/IO/DWG/DwgReaderTests.cs

@@ -56,6 +56,7 @@ public override void AssertDocumentContent(FileModel test)
 		public override void AssertDocumentTree(FileModel test)
 		{
 			DwgReaderConfiguration configuration = new DwgReaderConfiguration();
+			configuration.KeepUnknownNonGraphicalObjects = true;
 			configuration.KeepUnknownEntities = true;
 
 			CadDocument doc = DwgReader.Read(test.Path, configuration);

src/ACadSharp.Tests/IO/DXF/DxfReaderTests.cs

@@ -116,6 +116,7 @@ public override void AssertDocumentContent(FileModel test)
 		public override void AssertDocumentTree(FileModel test)
 		{
 			DxfReaderConfiguration configuration = new DxfReaderConfiguration();
+			configuration.KeepUnknownNonGraphicalObjects = true;
 			configuration.KeepUnknownEntities = true;
 
 			CadDocument doc;

src/ACadSharp/IO/CadDocumentBuilder.cs

@@ -1,5 +1,6 @@
 using ACadSharp.Entities;
 using ACadSharp.IO.Templates;
+using ACadSharp.Objects;
 using ACadSharp.Tables;
 using ACadSharp.Tables.Collections;
 using System;
@@ -35,6 +36,8 @@ internal abstract class CadDocumentBuilder
 
 		public abstract bool KeepUnknownEntities { get; }
 
+		public abstract bool KeepUnknownNonGraphicalObjects { get; }
+
 		public ulong InitialHandSeed { get; set; } = 0;
 
 		protected Dictionary<ulong, CadTemplate> cadObjectsTemplates = new();
@@ -105,6 +108,12 @@ public bool TryGetCadObject<T>(ulong? handle, out T value) where T : CadObject
 					return false;
 				}
 
+				if (obj is UnknownNonGraphicalObject && !this.KeepUnknownNonGraphicalObjects)
+				{
+					value = null;
+					return false;
+				}
+
 				if (obj is T)
 				{
 					value = (T)obj;

src/ACadSharp/IO/CadReaderConfiguration.cs

@@ -14,12 +14,21 @@ public abstract class CadReaderConfiguration
 		public bool Failsafe { get; set; } = true;
 
 		/// <summary>
-		/// The reader will try to read and add to the document all <see cref="ObjectType.UNLISTED"/> that are linked to a <see cref="Classes. DxfClass"/> 
+		/// The reader will try to read and add to the document all <see cref="ObjectType.UNLISTED"/> that are linked to a <see cref="Classes.DxfClass"/> 
 		/// which may be a proxy or an entity that is not yet supported by ACadSharp, default value is set to false.
 		/// </summary>
 		/// <remarks>
-		/// These entities do not contain any geometric information and will be ignored by the writers
+		/// These entities do not contain any geometric information and will be ignored by the writers.
 		/// </remarks>
 		public bool KeepUnknownEntities { get; set; } = false;
+
+		/// <summary>
+		/// The reader will try to read and add to the document all <see cref="ObjectType.UNLISTED"/> that are linked to a <see cref="Classes.DxfClass"/> 
+		/// which may be a proxy or an NonGraphicalObject that is not yet supported by ACadSharp, default value is set to false.
+		/// </summary>
+		/// <remarks>
+		/// These NonGraphicalObjects do not contain any information and will be ignored by the writers.
+		/// </remarks>
+		public bool KeepUnknownNonGraphicalObjects { get; set; } = false;
 	}
 }

src/ACadSharp/IO/DWG/DwgDocumentBuilder.cs

@@ -1,6 +1,7 @@
 using ACadSharp.Entities;
 using ACadSharp.IO.Templates;
 using ACadSharp.Objects;
+using System;
 using System.Collections.Generic;
 
 namespace ACadSharp.IO.DWG
@@ -13,16 +14,14 @@ internal class DwgDocumentBuilder : CadDocumentBuilder
 
 		public List<CadBlockRecordTemplate> BlockRecordTemplates { get; set; } = new();
 
-		public List<UnknownEntity> UnknownEntities { get; } = new();
-
-		public List<UnknownNonGraphicalObject> UnknownNonGraphicalObjects { get; } = new();
-
 		public List<Entity> PaperSpaceEntities { get; } = new();
 
 		public List<Entity> ModelSpaceEntities { get; } = new();
 
 		public override bool KeepUnknownEntities => this.Configuration.KeepUnknownEntities;
 
+		public override bool KeepUnknownNonGraphicalObjects => this.Configuration.KeepUnknownNonGraphicalObjects;
+
 		public DwgDocumentBuilder(ACadVersion version, CadDocument document, DwgReaderConfiguration configuration)
 			: base(version, document)
 		{

src/ACadSharp/IO/DWG/DwgStreamReaders/DwgObjectReader.cs

@@ -1066,8 +1066,6 @@ private CadTemplate readUnknownEntity(DxfClass dxfClass)
 			UnknownEntity entity = new UnknownEntity(dxfClass);
 			CadUnknownEntityTemplate template = new CadUnknownEntityTemplate(entity);
 
-			this._builder.UnknownEntities.Add(entity);
-
 			this.readCommonEntityData(template);
 
 			return template;
@@ -1078,8 +1076,6 @@ private CadTemplate readUnknownNonGraphicalObject(DxfClass dxfClass)
 			UnknownNonGraphicalObject obj = new UnknownNonGraphicalObject(dxfClass);
 			CadUnknownNonGraphicalObjectTemplate template = new CadUnknownNonGraphicalObjectTemplate(obj);
 
-			this._builder.UnknownNonGraphicalObjects.Add(obj);
-
 			this.readCommonNonEntityData(template);
 
 			return template;

src/ACadSharp/IO/DXF/DxfDocumentBuilder.cs

@@ -17,6 +17,8 @@ internal class DxfDocumentBuilder : CadDocumentBuilder
 
 		public override bool KeepUnknownEntities => this.Configuration.KeepUnknownEntities;
 
+		public override bool KeepUnknownNonGraphicalObjects => this.Configuration.KeepUnknownNonGraphicalObjects;
+
 		public DxfDocumentBuilder(ACadVersion version, CadDocument document, DxfReaderConfiguration configuration) : base(version, document)
 		{
 			this.Configuration = configuration;

src/ACadSharp/IO/DXF/DxfStreamReader/DxfObjectsSectionReader.cs

@@ -70,13 +70,34 @@ private CadTemplate readObject()
 				case DxfFileToken.ObjectXRecord:
 					return this.readObjectCodes<XRecord>(new CadXRecordTemplate(), this.readXRecord);
 				default:
-					this._builder.Notify($"Object not implemented: {this._reader.ValueAsString}", NotificationType.NotImplemented);
+					DxfMap map = DxfMap.Create<CadObject>();
+					CadUnknownNonGraphicalObjectTemplate unknownEntityTemplate = null;
+					if (this._builder.DocumentToBuild.Classes.TryGetByName(this._reader.ValueAsString, out Classes.DxfClass dxfClass))
+					{
+						this._builder.Notify($"NonGraphicalObject not supported read as an UnknownNonGraphicalObject: {this._reader.ValueAsString}", NotificationType.NotImplemented);
+						unknownEntityTemplate = new CadUnknownNonGraphicalObjectTemplate(new UnknownNonGraphicalObject(dxfClass));
+					}
+					else
+					{
+						this._builder.Notify($"UnknownNonGraphicalObject not supported: {this._reader.ValueAsString}", NotificationType.NotImplemented);
+					}
+
+					this._reader.ReadNext();
+
 					do
 					{
+						if (unknownEntityTemplate != null && this._builder.KeepUnknownEntities)
+						{
+							this.readCommonCodes(unknownEntityTemplate, out bool isExtendedData, map);
+							if (isExtendedData)
+								continue;
+						}
+
 						this._reader.ReadNext();
 					}
 					while (this._reader.DxfCode != DxfCode.Start);
-					return null;
+
+					return unknownEntityTemplate;
 			}
 		}
 

src/ACadSharp/IO/DXF/DxfStreamReader/DxfSectionReaderBase.cs

@@ -224,14 +224,7 @@ protected CadEntityTemplate readEntity()
 					}
 					while (this._reader.DxfCode != DxfCode.Start);
 
-					if (this._builder.Configuration.KeepUnknownEntities)
-					{
-						return unknownEntityTemplate;
-					}
-					else
-					{
-						return null;
-					}
+					return unknownEntityTemplate;
 			}
 		}