Automatically create new core properties part rather than throw exception

DocX/DocX.cs

 
             // If this document does not contain a coreFilePropertyPart create one.)
             if (!package.PartExists(new Uri("/docProps/core.xml", UriKind.Relative)))
-                throw new Exception("Core properties part doesn't exist.");
+                HelperFunctions.CreateCorePropertiesPart(this);
 
             XDocument corePropDoc;
             PackagePart corePropPart = package.GetPart(new Uri("/docProps/core.xml", UriKind.Relative));

DocX/HelperFunctions.cs

             return settingsPart;
         }
 
+        internal static void CreateCorePropertiesPart(DocX document)
+        {
+            PackagePart corePropertiesPart = document.package.CreatePart(new Uri("/docProps/core.xml", UriKind.Relative), "application/vnd.openxmlformats-package.core-properties+xml", CompressionOption.Maximum);
+
+            XDocument corePropDoc = XDocument.Parse(@"<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
+<cp:coreProperties xmlns:cp='http://schemas.openxmlformats.org/package/2006/metadata/core-properties' xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:dcterms='http://purl.org/dc/terms/' xmlns:dcmitype='http://purl.org/dc/dcmitype/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'> 
+   <dc:title></dc:title>
+   <dc:subject></dc:subject>
+   <dc:creator></dc:creator>
+   <cp:keywords></cp:keywords>
+   <dc:description></dc:description>
+   <cp:lastModifiedBy></cp:lastModifiedBy>
+   <cp:revision>1</cp:revision>
+   <dcterms:created xsi:type='dcterms:W3CDTF'>"+ DateTime.UtcNow.ToString("s") + "Z" + @"</dcterms:created>
+   <dcterms:modified xsi:type='dcterms:W3CDTF'>" + DateTime.UtcNow.ToString("s") + "Z" + @"</dcterms:modified>
+</cp:coreProperties>");
+
+            using (TextWriter tw = new StreamWriter(new PackagePartStream(corePropertiesPart.GetStream(FileMode.Create, FileAccess.Write))))
+                corePropDoc.Save(tw, SaveOptions.None);
+
+            document.package.CreateRelationship(corePropertiesPart.Uri, TargetMode.Internal, "http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties");
+        }
+
         internal static void CreateCustomPropertiesPart(DocX document)
         {
             PackagePart customPropertiesPart = document.package.CreatePart(new Uri("/docProps/custom.xml", UriKind.Relative), "application/vnd.openxmlformats-officedocument.custom-properties+xml", CompressionOption.Maximum);

DocX/bin/Release/DocX.XML

             <param name="name">The name of this Picture.</param>
             <param name="descr">The description of this Picture.</param>
         </member>
+        <member name="M:Novacode.Paragraph.ReplacePicture(Novacode.Picture,Novacode.Picture)">
+            <summary>
+            Replaces a Picture with a new one.
+            </summary>
+            <remarks>
+            Only the content of the picture will be replaced - positioning inside the document and all other attributes will be preserved.
+            </remarks>
+            <param name="toBeReplaced">The picture object to be replaced.</param>
+            <param name="replaceWith">The picture object that should be inserted instead of <paramref name="toBeReplaced"/>.</param>
+            <returns>The new <see cref="T:Novacode.Picture"/> object that replaces the old one.</returns>
+        </member>
         <member name="M:Novacode.Paragraph.CreateEdit(Novacode.EditType,System.DateTime,System.Object)">
             <summary>
             Creates an Edit either a ins or a del with the specified content and date
             
              </code>
              </example>
-             <seealso cref="M:Novacode.DocX.AddImage(System.String,System.String)"/>
+             <seealso cref="!:AddImage(string, string)"/>
              <seealso cref="M:Novacode.DocX.AddImage(System.IO.Stream,System.String)"/>
              <seealso cref="P:Novacode.Paragraph.Pictures"/>
              <seealso cref="M:Novacode.Paragraph.InsertPicture(Novacode.Picture,System.Int32)"/>
             <param name="templateStream">The stream of the document template file.</param>
             <param name="includeContent">Whether to copy the document template text content to document.</param>
         </member>
-        <member name="M:Novacode.DocX.AddImage(System.String,System.String)">
+        <member name="M:Novacode.DocX.AddImage(System.String)">
              <summary>
              Add an Image into this document from a fully qualified or relative filename.
              </summary>
              }
              </code>
              </example>
-             <seealso cref="M:Novacode.DocX.AddImage(System.String,System.String)"/>
+             <seealso cref="!:AddImage(string, string)"/>
              <seealso cref="M:Novacode.Paragraph.InsertPicture(Novacode.Picture,System.Int32)"/>
         </member>
         <member name="M:Novacode.DocX.AddHyperlink(System.String,System.Uri)">