Support getting project item by name in PowerShell scripts.

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

@@ -48,5 +48,20 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 		{
 			return GetEnumerator();
 		}
+		
+		public ProjectItem Item(string name)
+		{
+			foreach (ProjectItem item in this) {
+				if (IsMatch(item, name)) {
+					return item;
+				}
+			}
+			return null;
+		}
+		
+		bool IsMatch(ProjectItem item, string name)
+		{
+			return String.Equals(item.Name, name, StringComparison.InvariantCultureIgnoreCase);
+		}
 	}
 }

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

@@ -300,5 +300,29 @@ namespace PackageManagement.Tests.EnvDTE
 			
 			ProjectItemCollectionAssertAreEqual(expectedItems, enumerable);
 		}
+		
+		[Test]
+		public void Item_GetProjectItemByName_ReturnsFileInsideProject()
+		{
+			CreateProjectItems();
+			msbuildProject.AddFile("Program.cs");
+			
+			var projectItem = projectItems.Item("Program.cs") as DTE.ProjectItem;
+			string projectItemName = projectItem.Name;
+			
+			Assert.AreEqual("Program.cs", projectItemName);
+		}
+		
+		[Test]
+		public void Item_GetProjectItemByNameWhenNameCaseDoesNotMatchFileNameInProject_ReturnsFileInsideProject()
+		{
+			CreateProjectItems();
+			msbuildProject.AddFile("Program.cs");
+			
+			var projectItem = projectItems.Item("PROGRAM.CS") as DTE.ProjectItem;
+			string projectItemName = projectItem.Name;
+			
+			Assert.AreEqual("Program.cs", projectItemName);
+		}
 	}
 }