Implement Demo feature.

- NEU: Eingebautes Demo-Dokument zum Ausprobieren.

zaaReloaded2/Demo/Demo.cs

@@ -0,0 +1,75 @@
+/* Demo.cs
+ * part of zaaReloaded2
+ * 
+ * Copyright 2015 Daniel Kraus
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using Microsoft.Office.Interop.Word;
+
+namespace zaaReloaded2.Demo
+{
+    /// <summary>
+    /// Static class that serves to load an embedded Word document
+    /// into a temporary file and open that temporary file in Word.
+    /// </summary>
+    static class Demo
+    {
+        #region Public methods
+
+        /// <summary>
+        /// Opens a demo document. The document's Saved property is set to
+        /// false so that a user who wants to save changes will be prompted
+        /// for a file name.
+        /// </summary>
+        public static void OpenDemoDocument()
+        {
+            string tempFile = CreateTempFileFromResource();
+            Document demoDoc = Globals.ThisAddIn.Application.Documents
+                .Add(Template: tempFile);
+            File.Delete(tempFile);
+        }
+
+        #endregion
+
+        #region Private methods
+
+        /// <summary>
+        /// Copies the built-in demo file from a resource stream to a
+        /// temporary file and returns the path to that file.
+        /// </summary>
+        /// <returns>Path to the newly created temporary file.</returns>
+        static string CreateTempFileFromResource()
+        {
+            string resourceName = "zaaReloaded2.Demo.Demo.docx";
+            Stream resourceStream = typeof(Demo).Assembly
+                .GetManifestResourceStream(resourceName);
+            if (resourceStream == null)
+            {
+                throw new IOException("Unable to open stream " + resourceName);
+            }
+            string fileName = Path.GetTempFileName() + ".docx";
+            Stream tempStream = File.Create(fileName);
+            resourceStream.CopyTo(tempStream);
+            tempStream.Close();
+            return fileName;
+        }
+
+        #endregion
+    }
+}