Fixed null reference exception in the python forms designer when generating code for properties that have a null property value.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@4625 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/BackendBindings/Python/PythonBinding/Project/Src/PythonDesignerComponent.cs

@@ -543,7 +543,7 @@ namespace ICSharpCode.PythonBinding
 					}
 				} else if (IsResourcePropertyValue(propertyValue)) {
 					AppendResourceProperty(codeBuilder, propertyName, propertyValue);
-				} else if (propertyValue.GetType().IsArray) {
+				} else if (IsArray(propertyValue)) {
 					codeBuilder.AppendIndented(propertyName + " = ");
 					AppendSystemArray(codeBuilder, GetArrayType(propertyValue).FullName, propertyValue as ICollection, false);
 					codeBuilder.AppendLine();
@@ -891,5 +891,13 @@ namespace ICSharpCode.PythonBinding
 			Type type = obj.GetType();
 			return obj.GetType().GetElementType();
 		}
+		
+		static bool IsArray(object obj)
+		{
+			if (obj != null) {
+				return obj.GetType().IsArray;
+			}
+			return false;
+		}
 	}
 }

src/AddIns/BackendBindings/Python/PythonBinding/Test/Designer/AppendNullPropertyValueTestFixture.cs

@@ -0,0 +1,43 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Matthew Ward" email="mrward@users.sourceforge.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.ComponentModel;
+using ICSharpCode.PythonBinding;
+using NUnit.Framework;
+
+namespace PythonBinding.Tests.Designer
+{
+	/// <summary>
+	/// Tests that a null property value does not cause a NullReferenceException in the
+	/// PythonControl's AppendProperty method.
+	/// </summary>
+	[TestFixture]
+	public class AppendNullPropertyValueTestFixture
+	{
+		string fooBar;
+		
+		public string FooBar {
+			get { return fooBar; }
+			set { fooBar = value; }
+		}
+		
+		[Test]
+		public void GeneratedCode()
+		{
+			string expectedCode = "self._myObject.FooBar = None\r\n";
+			PropertyDescriptor propertyDescriptor = TypeDescriptor.GetProperties(this).Find("FooBar", false);
+			
+			PythonDesignerComponent designerComponent = new PythonDesignerComponent(null);
+			PythonCodeBuilder codeBuilder = new PythonCodeBuilder();
+			designerComponent.AppendProperty(codeBuilder, "self._myObject", this, propertyDescriptor);
+			string generatedCode = codeBuilder.ToString();
+			
+			Assert.AreEqual(expectedCode, generatedCode, generatedCode);
+		}
+	}
+}

src/AddIns/BackendBindings/Python/PythonBinding/Test/PythonBinding.Tests.csproj

@@ -161,6 +161,7 @@
     <Compile Include="Converter\WhileLoopConversionTestFixture.cs" />
     <Compile Include="Converter\XmlDocCommentConversionTestFixture.cs" />
     <Compile Include="DebugPythonCommandTestFixture.cs" />
+    <Compile Include="Designer\AppendNullPropertyValueTestFixture.cs" />
     <Compile Include="Designer\ConvertCustomClassUsingTypeConverterTestFixture.cs" />
     <Compile Include="Designer\CreateDesignerComponentTests.cs" />
     <Compile Include="Designer\CursorTypeResolutionTestFixture.cs" />