Änderung

- Methoden zum Abfragen ob die Schlüssel existieren dazu
- Methode zum Abfragen ob der Wert null oder leer ist dazu

Roaming/Roaming.cs

@@ -264,6 +264,65 @@ namespace Eugen.ESystem
             }
         }
 
+        /// <summary>
+        /// Checks whether the roaming path exists
+        /// </summary>
+        /// <returns>'True' if the roaming path exists, otherwise 'false'</returns>
+        public bool RoamingPathExists()
+        {
+            return Directory.Exists(RoamingPath);
+        }
+
+        /// <summary>
+        /// Checks whether the main key exists
+        /// </summary>
+        /// <returns>'True' if the main key exists, otherwise 'false'</returns>
+        public bool MainKeyExists()
+        {
+            return Directory.Exists(RoamingPath + "\\" + MainKey);
+        }
+
+        /// <summary>
+        /// Checks whether the sub key exists
+        /// </summary>
+        /// <returns>'True' if the sub key exists, otherwise 'false'</returns>
+        public bool SubKeyExists()
+        {
+            return Directory.Exists(RoamingPath + "\\" + MainKey + "\\" + SubKey);
+        }
+
+        /// <summary>
+        /// Checks whether the key exists
+        /// </summary>
+        /// <returns>'True' if the key exists, otherwise 'false'</returns>
+        public bool KeyExists()
+        {
+            return Directory.Exists(RoamingPath + "\\" + MainKey + "\\" + SubKey + "\\" + Key);
+        }
+
+        /// <summary>
+        /// Checks whether the key is 'null' or 'empty'
+        /// </summary>
+        /// <returns>'True' if the key is 'null' or 'empty', otherwise 'false'</returns>
+        public bool ValueIsNullOrEmpty()
+        {
+            if (KeyExists())
+            {
+                if (String.IsNullOrEmpty(ReadKey()))
+                {
+                    return true;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+            else
+            {
+                return true;
+            }
+        }
+
         private string GetAppData()
         {
             return Environment.GetEnvironmentVariable("APPDATA"); //Ermittelt den Pafad des Verzeichnisses '%APPDATA%\Roaming'

Test_Roaming/Form1.cs

@@ -151,6 +151,7 @@ namespace Test_Roaming
                 roaming.DeleteMainKey(); //Hauptschlüssel löschen
 
                 labelResult.Text = "MainKey: " + mainKey + "\nSubKey: " + subKey + "\nKey: " + key + "\nValue: " + value + "\n\nSchreibe Key nach \'AppData\\Roaming\\'\nGelesener Wert: " + redvalue + "\nLösche Key/SubKey/MainKey";
+                labelResult.Text += "\n\nMainKey exist: " + roaming.MainKeyExists() + "\nSubKey exist: " + roaming.SubKeyExists() + "\nKey exist: " + roaming.KeyExists() + "\nValue ist null oder leer: " + roaming.ValueIsNullOrEmpty();
             }
             catch (Exception ex)
             {