mcs/class/referencesource/System.Activities.Presentation/Microsoft.Tools.Common/Microsoft/Activities/Presentation/ExpressionSettingHelper.cs

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace Microsoft.Activities.Presentation
   8 {
   9     using System.Activities.Expressions;
  10 using System.Activities.Presentation.Expressions;
  11 using System.Activities.Presentation.Model;
  12 using System.Diagnostics;
  13 using System.Diagnostics.CodeAnalysis;
  14 using System.Runtime.Versioning;
  15 using Microsoft.VisualBasic.Activities;
  16
  17     internal static class ExpressionSettingHelper
  18     {
  19         internal static readonly string VBExpressionLanguageName = (new VisualBasicValue<string>() as ITextExpression).Language;
  20
  21         [SuppressMessage("Reliability", "Reliability101", Justification = "We can't use Fx.Assert here since this is not a framework assembly.")]
  22         internal static string GetRootEditorSetting(ModelTreeManager modelTreeManager, FrameworkName targetFramework)
  23         {
  24             Debug.Assert(modelTreeManager != null, "modelTreeManager is null.");
  25             Debug.Assert(targetFramework != null, "targetFramework is null.");
  26
  27             string globalEditorSetting = null;
  28             if (Is45OrHigher(targetFramework))
  29             {
  30                 if (modelTreeManager != null)
  31                 {
  32                     ModelItem rootItem = modelTreeManager.Root;
  33                     if (rootItem != null)
  34                     {
  35                         object root = rootItem.GetCurrentValue();
  36                         globalEditorSetting = ExpressionActivityEditor.GetExpressionActivityEditor(root);
  37                         if (string.IsNullOrEmpty(globalEditorSetting))
  38                         {
  39                             globalEditorSetting = VBExpressionLanguageName;
  40                         }
  41                     }
  42                 }
  43             }
  44             else
  45             {
  46                 // When the target framework is less than 4.5, the root setting is ignored and always return VB
  47                 globalEditorSetting = VBExpressionLanguageName;
  48             }
  49
  50             return globalEditorSetting;
  51         }
  52
  53         private static bool Is45OrHigher(FrameworkName frameworkName)
  54         {
  55             return frameworkName.Version.Major > 4 || (frameworkName.Version.Major == 4 && frameworkName.Version.Minor >= 5);
  56         }
  57     }
  58 }