Added cap value report saver to wpf sample.

samples/Sample.WPF/ViewModels/DataSourceVM.cs

@@ -1,11 +1,19 @@
 using GalaSoft.MvvmLight;
+using GalaSoft.MvvmLight.Command;
+using GalaSoft.MvvmLight.Messaging;
+using ModernWpf.Messages;
 using NTwain;
 using NTwain.Data;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
+using System.Diagnostics;
+using System.IO;
 using System.Linq;
+using System.Text;
 using System.Windows.Data;
+using System.Windows.Input;
 
 namespace Sample.WPF
 {
@@ -69,5 +77,55 @@ namespace Sample.WPF
         }
 
         public ObservableCollection<CapVM> Caps { get; private set; }
+
+        private ICommand _saveCapCommand;
+
+        public ICommand SaveCapValuesCommand
+        {
+            get
+            {
+                return _saveCapCommand ?? (_saveCapCommand = new RelayCommand(() =>
+                {
+                    Messenger.Default.Send(new ChooseFileMessage(files =>
+                    {
+                        StringBuilder report = new StringBuilder();
+                        report.Append("Cap values for TWAIN device ").AppendLine(DS.Name);
+                        report.Append("Generated on ").AppendLine(DateTime.Now.ToString("yyyy/MM/dd hh:mm tt")).AppendLine();
+
+                        foreach (CapVM cap in _capView)
+                        {
+                            report.Append(cap.Name).AppendLine(":");
+                            try
+                            {
+                                report.Append('\t').Append("Maybe: ").Append(cap.Supports).AppendLine();
+                                report.Append('\t').Append("Get: ");
+                                foreach (var v in cap.Get())
+                                {
+                                    report.Append(v).Append(',');
+                                }
+                                report.AppendLine();
+                                report.Append('\t').Append("Current: ").Append(cap.GetCurrent()).AppendLine();
+                            }
+                            catch (Exception ex)
+                            {
+                                report.Append('\t').Append("Failed: ").Append(ex.Message).AppendLine();
+                            }
+                            report.AppendLine();
+                        }
+
+                        File.WriteAllText(files.First(), report.ToString());
+
+                        using (Process.Start(files.First())) { }
+                    })
+                    {
+                        Caption = "Choose Save File",
+                        Filters = "Text files|*.txt",
+                        InitialFileName = DS.Name + " capability",
+                        Purpose = FilePurpose.Save,
+                    });
+                }, () => DS.IsOpen));
+            }
+        }
+
     }
 }