Issue 200 async Read

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

@@ -1,5 +1,6 @@
 using ACadSharp.IO;
 using ACadSharp.Tests.TestModels;
+using System.Threading.Tasks;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -23,6 +24,18 @@ public override void ReadTest(FileModel test)
 			base.ReadTest(test);
 		}
 
+		[Theory]
+		[MemberData(nameof(DwgFilePaths))]
+		public async Task ReadAsyncTest(FileModel test)
+		{
+			CadDocument doc = null;
+			using (DwgReader reader = new DwgReader(test.Path))
+			{
+				reader.OnNotification += this.onNotification;
+				doc = await reader.ReadAsync();
+			}
+		}
+
 		[Theory]
 		[MemberData(nameof(DwgFilePaths))]
 		public override void AssertDocumentDefaults(FileModel test)

src/ACadSharp.Tests/Internal/DwgFileHeaderExploration.cs

@@ -32,10 +32,10 @@ public DwgFileHeaderExploration(ITestOutputHelper output) : base()
 		[MemberData(nameof(DwgFilePaths))]
 		public void PrintFileHeaderInfo(string test)
 		{
-			DwgFileHeader fh;
+			DwgFileHeader fh = null;
 			using (DwgReader reader = new DwgReader(test))
 			{
-				fh = reader.readFileHeader();
+				//fh = reader.readFileHeader();
 			}
 
 			printHeader(fh);

src/ACadSharp/CadDocument.cs

@@ -24,7 +24,15 @@ public class CadDocument : IHandledCadObject
 		/// <summary>
 		/// Contains all the header variables for this document.
 		/// </summary>
-		public CadHeader Header { get; internal set; }
+		public CadHeader Header
+		{
+			get { return this._header; }
+			internal set
+			{
+				this._header = value;
+				this._header.Document = this;
+			}
+		}
 
 		/// <summary>
 		/// Accesses drawing properties such as the Title, Subject, Author, and Keywords properties
@@ -166,6 +174,8 @@ internal set
 		/// </summary>
 		public BlockRecord PaperSpace { get { return this.BlockRecords[BlockRecord.PaperSpaceName]; } }
 
+		private CadHeader _header = null;
+
 		private CadDictionary _rootDictionary = null;
 
 		//Contains all the objects in the document

src/ACadSharp/DwgPreview.cs

@@ -1,13 +1,6 @@
-#region copyright
-//Copyright 2021, Albert Domenech.
-//All rights reserved. 
-//This source code is licensed under the MIT license. 
-//See LICENSE file in the project root for full license information.
-#endregion
-namespace ACadSharp
+namespace ACadSharp
 {
 	public class DwgPreview
 	{
-
 	}
 }

src/ACadSharp/IO/CadDocumentBuilder.cs

@@ -297,4 +297,19 @@ private void addToMap(ICadObjectTemplate template)
 			this.cadObjects.Add(template.CadObject.Handle, template.CadObject);
 		}
 	}
+
+	internal abstract class CadDocumentBuilder<T> : CadDocumentBuilder
+	where T : CadReaderConfiguration
+	{
+		public T Configuration { get; }
+
+		public override bool KeepUnknownEntities => this.Configuration.KeepUnknownEntities;
+
+		public override bool KeepUnknownNonGraphicalObjects => this.Configuration.KeepUnknownNonGraphicalObjects;
+
+		protected CadDocumentBuilder(ACadVersion version, CadDocument document, T configuration) : base(version, document)
+		{
+			this.Configuration = configuration;
+		}
+	}
 }

src/ACadSharp/IO/CadReaderBase.cs

@@ -4,6 +4,8 @@
 using System;
 using System.IO;
 using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace ACadSharp.IO
 {
@@ -45,6 +47,9 @@ protected CadReaderBase(Stream stream, NotificationEventHandler notification = n
 		/// <inheritdoc/>
 		public abstract CadDocument Read();
 
+		/// <inheritdoc/>
+		public abstract Task<CadDocument> ReadAsync(CancellationToken cancellationToken = default);
+
 		/// <inheritdoc/>
 		public abstract CadHeader ReadHeader();
 

src/ACadSharp/IO/DWG/DwgDocumentBuilder.cs

@@ -1,15 +1,11 @@
 using ACadSharp.Entities;
 using ACadSharp.IO.Templates;
-using ACadSharp.Objects;
-using System;
 using System.Collections.Generic;
 
 namespace ACadSharp.IO.DWG
 {
-	internal class DwgDocumentBuilder : CadDocumentBuilder
+	internal class DwgDocumentBuilder : CadDocumentBuilder<DwgReaderConfiguration>
 	{
-		public DwgReaderConfiguration Configuration { get; }
-
 		public DwgHeaderHandlesCollection HeaderHandles { get; set; } = new();
 
 		public List<CadBlockRecordTemplate> BlockRecordTemplates { get; set; } = new();
@@ -18,14 +14,9 @@ internal class DwgDocumentBuilder : CadDocumentBuilder
 
 		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)
+			: base(version, document, configuration)
 		{
-			this.Configuration = configuration;
 		}
 
 		public override void BuildDocument()