build fixes for PR #574

NAudioWpfDemo/MediaFoundationEncode/MediaFoundationEncodeViewModel.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
-using System.Windows.Forms;
+using System.Windows;
 using System.Windows.Input;
 using NAudio.MediaFoundation;
 using NAudio.Wave;
@@ -77,7 +77,7 @@ namespace NAudioWpfDemo.MediaFoundationEncode
             }
             catch (Exception e)
             {
-                MessageBox.Show(String.Format("Not a supported input file ({0})", e.Message));
+                MessageBox.Show($"Not a supported input file ({e.Message})");
             }
             return isValid;
         }

NAudioWpfDemo/MediaFoundationPlayback/MediaFoundationPlaybackViewModel.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Windows.Forms;
+using System.Windows;
 using System.Windows.Threading;
 using NAudio.Wave;
 using NAudioWpfDemo.ViewModel;

azure-pipelines.yml

@@ -2,9 +2,10 @@
 # Build and run tests for .NET Desktop or Windows classic desktop solutions.
 # Add steps that publish symbols, save build artifacts, and more:
 # https://docs.microsoft.com/azure/devops/pipelines/apps/windows/dot-net
+# vmImage options: https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops#use-a-microsoft-hosted-agent
 
 pool:
-  vmImage: 'VS2017-Win2016'
+  vmImage: 'windows-2019'
 
 variables:
   solution: '**/*.sln'

global.json

@@ -1,5 +1,5 @@
 {
   "msbuild-sdks": {
-    "MSBuild.Sdk.Extras": "2.0.31"
+    "MSBuild.Sdk.Extras": "2.0.54"
   }
 }