Squashed 'FSI.Lib/' content from commit 6aa4846

git-subtree-dir: FSI.Lib
git-subtree-split: 6aa48465a834a7bfdd9cbeae8d2e4f769d0c0ff8

FSI.Lib/WinSettings/XmlSettings.cs

@@ -0,0 +1,155 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Xml;
+
+namespace FSI.Lib.WinSettings
+{
+
+    /// <summary>
+    /// The <see cref="XmlSettings"/> class makes it very easy to save your application
+    /// settings to an XML file.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// To use the class, simply derive your own settings class from
+    /// <see cref="XmlSettings" /> and add the public properties that you want to be
+    /// saved as settings. You can then call the <see cref="Settings.Load"/> and
+    /// <see cref="Settings.Save"/> methods to read or write those settings to an XML
+    /// file.
+    /// </para>
+    /// <para>
+    /// Your derived class' constructor should initialize your settings properties to
+    /// their default values.
+    /// </para>
+    /// <para>
+    /// Two attributes are available for public properties in your derived class. The
+    /// first is <see cref="EncryptedSettingAttribute" />. Use this attribute if you
+    /// want the setting to be encrypted when saved to file. When using this attribute on
+    /// any property, you must provide a valid encryption password to the
+    /// <see cref="XmlSettings" /> constructor.
+    /// </para>
+    /// <para>
+    /// The second is the <see cref="ExcludedSettingAttribute"/>. Use this attribute
+    /// on any properties that are used internally by your code and should not saved to
+    /// file.
+    /// </para>
+    /// <para>
+    /// All public properties without the <see cref="ExcludedSettingAttribute"></see>
+    /// attribute must be of one of the supported data types. This includes all the basic
+    /// data types as well as <see cref="string[]"></see> and <see cref="byte[]"></see>.
+    /// All other types will raise an exception.
+    /// </para>
+    /// </remarks>
+    /// <example>
+    /// The following example creates a settings class called <c>MySettings</c> with
+    /// several properties, two of which are encrypted when saved to file.
+    /// <code>
+    /// public class MySettings : XmlSettings
+    /// {
+    ///     // Define properties to be saved to file
+    ///     public string EmailHost { get; set; }
+    ///     public int EmailPort { get; set; }
+    /// 
+    ///     // The following properties will be encrypted
+    ///     [EncryptedSetting]
+    ///     public string UserName { get; set; }
+    ///     [EncryptedSetting]
+    ///     public string Password { get; set; }
+    /// 
+    ///     // The following property will not be saved to file
+    ///     // Non-public properties are also not saved to file
+    ///     [ExcludedSetting]
+    ///     public DateTime Created { get; set; }
+    /// 
+    ///     public MySettings(string filename)
+    ///         : base(filename, "Password123")
+    ///     {
+    ///         // Set initial, default property values
+    ///         EmailHost = string.Empty;
+    ///         EmailPort = 0;
+    ///         UserName = string.Empty;
+    ///         Password = string.Empty;
+    /// 
+    ///         Created = DateTime.Now;
+    ///     }
+    /// }
+    /// </code>
+    /// </example>
+    /// <seealso cref="IniSettings"/>
+    /// <seealso cref="RegistrySettings"/>
+    public abstract class XmlSettings : Settings
+    {
+        /// <summary>
+        /// Gets or sets the name of the XML settings file.
+        /// </summary>
+        [ExcludedSetting]
+        public string FileName { get; set; }
+
+        /// <summary>
+        /// Constructs an instance of the <see cref="XmlSettings"></see> class.
+        /// </summary>
+        /// <param name="filename">Name of the settings file.</param>
+        /// <param name="password">Encryption password. May be <c>null</c> if
+        /// no settings use the <see cref="EncryptedSettingAttribute" />
+        /// attribute.</param>
+        public XmlSettings(string filename, string password = null)
+            : base(password)
+        {
+
+
+            if (string.IsNullOrWhiteSpace(filename))
+                throw new ArgumentException("A valid file name is required.", nameof(filename));
+            FileName = filename;
+        }
+
+        /// <summary>
+        /// Performs internal load operations.
+        /// </summary>
+        /// <param name="settings">Settings to be loaded.</param>
+        public override void OnLoadSettings(IEnumerable<Setting> settings)
+        {
+            if (File.Exists(FileName))
+            {
+                // Load XML document
+                XmlDocument doc = new XmlDocument();
+                doc.Load(FileName);
+                // Read settings
+                foreach (Setting setting in settings)
+                {
+                    XmlNode node = doc.DocumentElement?.SelectSingleNode(setting.Name);
+                    if (node != null)
+                        setting.SetValueFromString(node.InnerText);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Performs internal save operations.
+        /// </summary>
+        /// <param name="settings">Settings to be saved.</param>
+        public override void OnSaveSettings(IEnumerable<Setting> settings)
+        {
+            // Create settings document
+            XmlDocument doc = new XmlDocument();
+            doc.AppendChild(doc.CreateXmlDeclaration("1.0", "UTF-8", null));
+            doc.AppendChild(doc.CreateElement("Settings"));
+            // Write settings
+            foreach (Setting setting in settings)
+            {
+                string value = setting.GetValueAsString();
+                if (value != null)
+                {
+                    XmlElement element = doc.CreateElement(setting.Name);
+                    element.InnerText = value;
+#if NET472
+                    doc.DocumentElement.AppendChild(element);
+#elif NET6_0
+                    doc.DocumentElement!.AppendChild(element);
+#endif
+                }
+            }
+            doc.Save(FileName);
+        }
+    }
+}