Fix primary key property being identified as a property for a related entity.

src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/CodeType.cs

@@ -8,6 +8,8 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 {
 	public class CodeType : CodeElement
 	{
+		CodeTypeMembers members;
+		
 		/// <summary>
 		/// Note that projectContent may be different to the IClass.ProjectContent since the class
 		/// is retrieved from the namespace contents and could belong to a separate project or
@@ -46,7 +48,12 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 		}
 		
 		public virtual CodeElements Members {
-			get { return new CodeTypeMembers(ProjectContent, Class); }
+			get {
+				if (members == null) {
+					members = new CodeTypeMembers(ProjectContent, Class);
+				}
+				return members;
+			}
 		}
 		
 		public virtual CodeElements Bases {

src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/CodeClass2Tests.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.Collections.Generic;
 using ICSharpCode.PackageManagement.EnvDTE;
 using ICSharpCode.SharpDevelop.Dom;
 using NUnit.Framework;
@@ -261,5 +262,21 @@ namespace PackageManagement.Tests.EnvDTE
 			Assert.AreEqual(1, partialClasses.Count);
 			Assert.AreEqual(codeClass, firstClass);
 		}
+		
+		[Test]
+		public void Members_GetFirstPropertyTwice_PropertiesAreConsideredEqualWhenAddedToList()
+		{
+			CreateProjectContent();
+			CreatePublicClass("MyClass");
+			helper.AddPropertyToClass("MyClass.MyProperty");
+			CodeProperty2 property = codeClass.Members.FirstCodeProperty2OrDefault();
+			var properties = new List<CodeProperty2>();
+			properties.Add(property);
+			
+			CodeProperty2 property2 = codeClass.Members.FirstCodeProperty2OrDefault();
+			
+			bool contains = properties.Contains(property2);
+			Assert.IsTrue(contains);
+		}
 	}
 }