Added support for code contracts (requires VS support!)

Implemented Contracts into existing classes (yet incomplete especially with Interface implementations in NavObject). Otherwise it basically works.
Started class for interfacing to finsql.exe.

NAV Source Control Test Host/App.config

@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
     <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/>
     </startup>
-</configuration>
+</configuration>

NAV Source Control Test Host/NAV Source Control Test Host.csproj

@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>NavScm.TestHost</RootNamespace>
     <AssemblyName>NAV Source Control Test Host</AssemblyName>
-    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <PublishUrl>publish\</PublishUrl>
@@ -27,6 +27,8 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
+    <CodeContractsAssemblyMode>0</CodeContractsAssemblyMode>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -37,6 +39,49 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <CodeContractsEnableRuntimeChecking>True</CodeContractsEnableRuntimeChecking>
+    <CodeContractsRuntimeOnlyPublicSurface>False</CodeContractsRuntimeOnlyPublicSurface>
+    <CodeContractsRuntimeThrowOnFailure>False</CodeContractsRuntimeThrowOnFailure>
+    <CodeContractsRuntimeCallSiteRequires>False</CodeContractsRuntimeCallSiteRequires>
+    <CodeContractsRuntimeSkipQuantifiers>False</CodeContractsRuntimeSkipQuantifiers>
+    <CodeContractsRunCodeAnalysis>True</CodeContractsRunCodeAnalysis>
+    <CodeContractsNonNullObligations>True</CodeContractsNonNullObligations>
+    <CodeContractsBoundsObligations>True</CodeContractsBoundsObligations>
+    <CodeContractsArithmeticObligations>True</CodeContractsArithmeticObligations>
+    <CodeContractsEnumObligations>True</CodeContractsEnumObligations>
+    <CodeContractsRedundantAssumptions>True</CodeContractsRedundantAssumptions>
+    <CodeContractsAssertsToContractsCheckBox>True</CodeContractsAssertsToContractsCheckBox>
+    <CodeContractsRedundantTests>True</CodeContractsRedundantTests>
+    <CodeContractsMissingPublicRequiresAsWarnings>True</CodeContractsMissingPublicRequiresAsWarnings>
+    <CodeContractsMissingPublicEnsuresAsWarnings>False</CodeContractsMissingPublicEnsuresAsWarnings>
+    <CodeContractsInferRequires>True</CodeContractsInferRequires>
+    <CodeContractsInferEnsures>False</CodeContractsInferEnsures>
+    <CodeContractsInferEnsuresAutoProperties>True</CodeContractsInferEnsuresAutoProperties>
+    <CodeContractsInferObjectInvariants>False</CodeContractsInferObjectInvariants>
+    <CodeContractsSuggestAssumptions>False</CodeContractsSuggestAssumptions>
+    <CodeContractsSuggestAssumptionsForCallees>False</CodeContractsSuggestAssumptionsForCallees>
+    <CodeContractsSuggestRequires>False</CodeContractsSuggestRequires>
+    <CodeContractsNecessaryEnsures>True</CodeContractsNecessaryEnsures>
+    <CodeContractsSuggestObjectInvariants>False</CodeContractsSuggestObjectInvariants>
+    <CodeContractsSuggestReadonly>True</CodeContractsSuggestReadonly>
+    <CodeContractsRunInBackground>True</CodeContractsRunInBackground>
+    <CodeContractsShowSquigglies>True</CodeContractsShowSquigglies>
+    <CodeContractsUseBaseLine>False</CodeContractsUseBaseLine>
+    <CodeContractsEmitXMLDocs>False</CodeContractsEmitXMLDocs>
+    <CodeContractsCustomRewriterAssembly />
+    <CodeContractsCustomRewriterClass />
+    <CodeContractsLibPaths />
+    <CodeContractsExtraRewriteOptions />
+    <CodeContractsExtraAnalysisOptions />
+    <CodeContractsSQLServerOption />
+    <CodeContractsBaseLineFile />
+    <CodeContractsCacheAnalysisResults>True</CodeContractsCacheAnalysisResults>
+    <CodeContractsSkipAnalysisIfCannotConnectToCache>False</CodeContractsSkipAnalysisIfCannotConnectToCache>
+    <CodeContractsFailBuildOnWarnings>False</CodeContractsFailBuildOnWarnings>
+    <CodeContractsBeingOptimisticOnExternal>True</CodeContractsBeingOptimisticOnExternal>
+    <CodeContractsRuntimeCheckingLevel>Full</CodeContractsRuntimeCheckingLevel>
+    <CodeContractsReferenceAssembly>%28none%29</CodeContractsReferenceAssembly>
+    <CodeContractsAnalysisWarningLevel>0</CodeContractsAnalysisWarningLevel>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>

NAVSCM Library/App.config

@@ -1,7 +1,7 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
   
   <connectionStrings>
-    <add name="TERRABIT_2015_DEVEntities" connectionString="metadata=res://*/NavScm.NavInterface.SQL.Model1.csdl|res://*/NavScm.NavInterface.SQL.Model1.ssdl|res://*/NavScm.NavInterface.SQL.Model1.msl;provider=System.Data.SqlClient;provider connection string='data source=tbrt-sql-erp-01;initial catalog=&quot;TERRABIT 2015 DEV&quot;;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" />
+    <add name="TERRABIT_2015_DEVEntities" connectionString="metadata=res://*/NavScm.NavInterface.SQL.Model1.csdl|res://*/NavScm.NavInterface.SQL.Model1.ssdl|res://*/NavScm.NavInterface.SQL.Model1.msl;provider=System.Data.SqlClient;provider connection string='data source=tbrt-sql-erp-01;initial catalog=&quot;TERRABIT 2015 DEV&quot;;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient"/>
   </connectionStrings>
-</configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/></startup></configuration>

NAVSCM Library/NAVSCM Library.csproj

@@ -9,8 +9,10 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>NavScm</RootNamespace>
     <AssemblyName>NavScm Library</AssemblyName>
-    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <CodeContractsAssemblyMode>1</CodeContractsAssemblyMode>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -22,6 +24,49 @@
     <WarningLevel>4</WarningLevel>
     <DocumentationFile>
     </DocumentationFile>
+    <CodeContractsEnableRuntimeChecking>True</CodeContractsEnableRuntimeChecking>
+    <CodeContractsRuntimeOnlyPublicSurface>False</CodeContractsRuntimeOnlyPublicSurface>
+    <CodeContractsRuntimeThrowOnFailure>True</CodeContractsRuntimeThrowOnFailure>
+    <CodeContractsRuntimeCallSiteRequires>False</CodeContractsRuntimeCallSiteRequires>
+    <CodeContractsRuntimeSkipQuantifiers>False</CodeContractsRuntimeSkipQuantifiers>
+    <CodeContractsRunCodeAnalysis>True</CodeContractsRunCodeAnalysis>
+    <CodeContractsNonNullObligations>True</CodeContractsNonNullObligations>
+    <CodeContractsBoundsObligations>True</CodeContractsBoundsObligations>
+    <CodeContractsArithmeticObligations>True</CodeContractsArithmeticObligations>
+    <CodeContractsEnumObligations>True</CodeContractsEnumObligations>
+    <CodeContractsRedundantAssumptions>True</CodeContractsRedundantAssumptions>
+    <CodeContractsAssertsToContractsCheckBox>True</CodeContractsAssertsToContractsCheckBox>
+    <CodeContractsRedundantTests>True</CodeContractsRedundantTests>
+    <CodeContractsMissingPublicRequiresAsWarnings>True</CodeContractsMissingPublicRequiresAsWarnings>
+    <CodeContractsMissingPublicEnsuresAsWarnings>False</CodeContractsMissingPublicEnsuresAsWarnings>
+    <CodeContractsInferRequires>True</CodeContractsInferRequires>
+    <CodeContractsInferEnsures>False</CodeContractsInferEnsures>
+    <CodeContractsInferEnsuresAutoProperties>True</CodeContractsInferEnsuresAutoProperties>
+    <CodeContractsInferObjectInvariants>False</CodeContractsInferObjectInvariants>
+    <CodeContractsSuggestAssumptions>False</CodeContractsSuggestAssumptions>
+    <CodeContractsSuggestAssumptionsForCallees>False</CodeContractsSuggestAssumptionsForCallees>
+    <CodeContractsSuggestRequires>False</CodeContractsSuggestRequires>
+    <CodeContractsNecessaryEnsures>True</CodeContractsNecessaryEnsures>
+    <CodeContractsSuggestObjectInvariants>False</CodeContractsSuggestObjectInvariants>
+    <CodeContractsSuggestReadonly>True</CodeContractsSuggestReadonly>
+    <CodeContractsRunInBackground>True</CodeContractsRunInBackground>
+    <CodeContractsShowSquigglies>True</CodeContractsShowSquigglies>
+    <CodeContractsUseBaseLine>False</CodeContractsUseBaseLine>
+    <CodeContractsEmitXMLDocs>True</CodeContractsEmitXMLDocs>
+    <CodeContractsCustomRewriterAssembly />
+    <CodeContractsCustomRewriterClass />
+    <CodeContractsLibPaths />
+    <CodeContractsExtraRewriteOptions />
+    <CodeContractsExtraAnalysisOptions />
+    <CodeContractsSQLServerOption />
+    <CodeContractsBaseLineFile />
+    <CodeContractsCacheAnalysisResults>True</CodeContractsCacheAnalysisResults>
+    <CodeContractsSkipAnalysisIfCannotConnectToCache>False</CodeContractsSkipAnalysisIfCannotConnectToCache>
+    <CodeContractsFailBuildOnWarnings>False</CodeContractsFailBuildOnWarnings>
+    <CodeContractsBeingOptimisticOnExternal>True</CodeContractsBeingOptimisticOnExternal>
+    <CodeContractsRuntimeCheckingLevel>Full</CodeContractsRuntimeCheckingLevel>
+    <CodeContractsReferenceAssembly>Build</CodeContractsReferenceAssembly>
+    <CodeContractsAnalysisWarningLevel>0</CodeContractsAnalysisWarningLevel>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -50,6 +95,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="NavInterface\DevEnvInterface.cs" />
     <Compile Include="NavInterface\NavSQL.designer.cs">
       <AutoGen>True</AutoGen>
       <DesignTime>True</DesignTime>

NAVSCM Library/NavInterface/DevEnvInterface.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO;
+using System.Diagnostics.Contracts;
+
+namespace NavScm.NavInterface
+{
+    /// <summary>
+    /// Interfaces to the NAV IDE command line interface to export / import objects.
+    /// </summary>
+    /// <remarks>
+    /// <para>The interface is based on the powershell snippets delivered with NAV. 
+    /// Note, that the devenv does not give any return values. Instead, errors can only
+    /// be detected by the existance of the log file, which is created only upon errors.</para>
+    /// <para>Currently, the interface expects to be able to access the database using
+    /// NTLM Single Sign on. SQL user/pass authentication is not supported.</para>
+    /// </remarks>
+    class DevEnvInterface
+    {
+        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(DevEnvInterface));
+
+        /// <summary>
+        /// Path to the dev env executable.
+        /// </summary>
+        protected string DevEnvPath { get; private set; }
+
+        /// <summary>
+        /// Hostname of the database server.
+        /// </summary>
+        protected string DatabaseServer { get; private set; }
+
+        /// <summary>
+        /// Name of the database itself.
+        /// </summary>
+        protected string DatabaseName { get; private set; }
+
+        /// <summary>
+        /// Create an interface class to a given NAV developer environment.
+        /// </summary>
+        /// <param name="devEnvPath">Full path and name to finsql.exe (or however you call it).</param>
+        public DevEnvInterface(string devEnvPath, string databaseServer, string databaseName)
+        {
+            Contract.Requires(devEnvPath != "");
+            Contract.Requires(databaseServer != "");
+            Contract.Requires(databaseName != "");
+            Contract.Ensures(File.Exists(DevEnvPath));
+            Contract.Ensures(databaseName == DatabaseName);
+            Contract.Ensures(databaseServer == DatabaseServer);
+            Contract.Ensures(devEnvPath == DevEnvPath);
+            
+            DevEnvPath = devEnvPath;
+            if (!File.Exists(DevEnvPath))
+                throw new InvalidOperationException($"The file {DevEnvPath} was not found.");
+
+            DatabaseServer = databaseServer;
+            DatabaseName = databaseName;
+
+            if (log.IsDebugEnabled)
+            {
+                log.Debug($"Constructed and attached to DevEnv {DevEnvPath}");
+                log.Debug($"Using database [{DatabaseName}] on server {DatabaseServer}");
+            }
+        }
+
+        /// <summary>
+        /// Exports a given NAV object to disk.
+        /// </summary>
+        /// <param name="obj">The NAV object as taken from the SQL database or from the cache (doesn't matter).</param>
+        /// <param name="destinationFileName">The name of the destination file. The system ensures, that the file
+        /// ends with .txt, as finsql.exe deduces the export format from the destiation files extension (crap).</param>
+        public void Export(NavObject obj, string destinationFileName)
+        {
+            Contract.Requires(obj != null);
+            Contract.Requires(destinationFileName != "");
+        }
+
+    }
+}

NAVSCM Library/NavInterface/NavObject.cs

@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Diagnostics.Contracts;
 
 namespace NavScm.NavInterface
 {
@@ -43,15 +44,21 @@ namespace NavScm.NavInterface
     /// <seealso cref="NavObjectType"/>
     partial class NavObject : IEquatable<NavObject>, IComparable, IComparable<NavObject>
     {
+        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(NavObject));
+
         /// <summary>
         /// Validate restrictions on supported objects as outlined in the class description.
         /// </summary>
         partial void OnLoaded()
         {
+            Contract.Requires(Company_Name.Length == 0);
+            Contract.Requires(Type >= 0  && Type <= 9 && Type != 2 && Type != 4 );
+            /*
             if (Company_Name.Length > 0)
                 throw new InvalidOperationException($"The object {CacheKey} holds a variant with the company name {Company_Name}, which is unsupported");
             if (Type < 0 || Type == 2 || Type == 4 || Type > 9)
                 throw new InvalidOperationException($"The object type of {CacheKey} is unsupported");
+            */
         }
 
         /// <summary>
@@ -75,20 +82,15 @@ namespace NavScm.NavInterface
         /// </summary>
         public string CacheKey
         {
-            get {
+            get { return $"{Type}.{ID}"; }   
-                return $"{Type}.{ID}";
-            }   
         }
 
         /// <summary>
         /// Converts the Date and Time fields to a combined Date/Time value.
         /// </summary>
-        public DateTime Modified
+        public DateTime ModifiedDate
         {
-            get
+            get { return Date.Add(Time.TimeOfDay); }
-            {
-                return Date.Add(Time.TimeOfDay);
-            }
         }
 
         /// <summary>