add support for ProjectExtensions in IProject API

src/AddIns/BackendBindings/Scripting/Test/ICSharpCode.Scripting.Tests.csproj

@@ -54,6 +54,9 @@
       <RequiredTargetFramework>4.0</RequiredTargetFramework>
     </Reference>
     <Reference Include="System.Xml" />
+    <Reference Include="System.Xml.Linq">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
     <Reference Include="WindowsBase">
       <RequiredTargetFramework>3.0</RequiredTargetFramework>
     </Reference>

src/AddIns/BackendBindings/Scripting/Test/Utils/MockProject.cs

@@ -299,6 +299,17 @@ namespace ICSharpCode.Scripting.Tests.Utils
 		{
 			throw new NotImplementedException();
 		}
+		
+		public System.Xml.Linq.XElement LoadProjectExtensions(string name)
+		{
+			throw new NotImplementedException();
+		}
+		
+		public void SaveProjectExtensions(string name, System.Xml.Linq.XElement element)
+		{
+			throw new NotImplementedException();
+		}
 		#endregion
+
 	}
 }

src/Main/Base/Project/Src/Project/AbstractProject.cs

@@ -7,6 +7,7 @@ using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Diagnostics;
 using System.IO;
+using System.Xml.Linq;
 
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Debugging;
@@ -563,5 +564,14 @@ namespace ICSharpCode.SharpDevelop.Project
 		public virtual void ProjectCreationComplete()
 		{
 		}
+		
+		public virtual XElement LoadProjectExtensions(string name)
+		{
+			return new XElement(name);
+		}
+		
+		public virtual void SaveProjectExtensions(string name, XElement element)
+		{
+		}
 	}
 }

src/Main/Base/Project/Src/Project/IProject.cs

@@ -7,6 +7,7 @@ using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.IO;
 using System.Xml;
+using System.Xml.Linq;
 
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Gui;
@@ -257,6 +258,16 @@ namespace ICSharpCode.SharpDevelop.Project
 		/// Notifies the project that it was succesfully created from a project template.
 		/// </summary>
 		void ProjectCreationComplete();
+		
+		/// <summary>
+		/// Loads the project extension content with the specified name.
+		/// </summary>
+		XElement LoadProjectExtensions(string name);
+		
+		/// <summary>
+		/// Saves the project extension content with the specified name.
+		/// </summary>
+		void SaveProjectExtensions(string name, XElement element);
 	}
 	
 	/// <summary>

src/Main/Base/Project/Src/Project/MSBuildBasedProject.cs

@@ -9,7 +9,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Xml;
-
+using System.Xml.Linq;
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Gui;
 using ICSharpCode.SharpDevelop.Internal.Templates;
@@ -1570,5 +1570,30 @@ namespace ICSharpCode.SharpDevelop.Project
 		}
 		 */
 		#endregion
+		
+		#region ProjectExtensions
+		public override void SaveProjectExtensions(string name, XElement element)
+		{
+			lock (SyncRoot) {
+				var existing = projectFile.Children.OfType<ProjectExtensionsElement>().FirstOrDefault();
+				if (existing == null) {
+					existing = projectFile.CreateProjectExtensionsElement();
+					projectFile.AppendChild(existing);
+				}
+				existing[name] = element.ToString();
+			}
+		}
+		
+		public override XElement LoadProjectExtensions(string name)
+		{
+			lock (SyncRoot) {
+				var existing = projectFile.Children.OfType<ProjectExtensionsElement>().FirstOrDefault();
+				if (existing == null) {
+					existing = projectFile.CreateProjectExtensionsElement();
+				}
+				return XElement.Parse(existing[name]) ?? new XElement(name);
+			}
+		}
+		#endregion
 	}
 }

src/Main/Base/Test/ICSharpCode.SharpDevelop.Tests.csproj

@@ -55,6 +55,9 @@
       <SpecificVersion>False</SpecificVersion>
     </Reference>
     <Reference Include="Microsoft.Build.Engine" />
+    <Reference Include="System.Xml.Linq">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
     <Reference Include="WindowsBase">
       <RequiredTargetFramework>3.0</RequiredTargetFramework>
     </Reference>

src/Main/Base/Test/StringTagProvider/MockProjectForTagProvider.cs

@@ -4,6 +4,8 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Xml.Linq;
+
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Dom;
 using ICSharpCode.SharpDevelop.Project;
@@ -280,5 +282,15 @@ namespace ICSharpCode.SharpDevelop.Tests.StringTagProvider
 		{
 			throw new NotImplementedException();
 		}
+		
+		public XElement LoadProjectExtensions(string name)
+		{
+			throw new NotImplementedException();
+		}
+		
+		public void SaveProjectExtensions(string name, XElement element)
+		{
+			throw new NotImplementedException();
+		}
 	}
 }