优化更新代码，添加界面功能并整合

WPFluent/Extensions/SnackbarServiceExtensions.cs

@@ -0,0 +1,93 @@
+
+
+
+using WPFluent.Controls;
+
+namespace WPFluent.Extensions;
+
+/// <summary>
+/// Extensions for the <see cref="ISnackbarService"/>.
+/// </summary>
+public static class SnackbarServiceExtensions
+{
+    /// <summary>
+    /// Shows the snackbar. If it is already visible, firstly hides it for a moment, changes its content, and then shows
+    /// it again.
+    /// </summary>
+    /// <param name="snackbarService">The <see cref="ISnackbarService"/>.</param>
+    /// <param name="title">Name displayed on top of snackbar.</param>
+    /// <param name="message">Message inside the snackbar.</param>
+    public static void Show(this ISnackbarService snackbarService, string title, string message)
+    { snackbarService.Show(title, message, ControlAppearance.Secondary, null, snackbarService.DefaultTimeOut); }
+
+    /// <summary>
+    /// Shows the snackbar. If it is already visible, firstly hides it for a moment, changes its content, and then shows
+    /// it again.
+    /// </summary>
+    /// <param name="snackbarService">The <see cref="ISnackbarService"/>.</param>
+    /// <param name="title">Name displayed on top of snackbar.</param>
+    /// <param name="message">Message inside the snackbar.</param>
+    /// <param name="Appearance">Display style.</param>
+    public static void Show(
+        this ISnackbarService snackbarService,
+        string title,
+        string message,
+        ControlAppearance appearance)
+    { snackbarService.Show(title, message, appearance, null, snackbarService.DefaultTimeOut); }
+
+    /// <summary>
+    /// Shows the snackbar. If it is already visible, firstly hides it for a moment, changes its content, and then shows
+    /// it again.
+    /// </summary>
+    /// <param name="snackbarService">The <see cref="ISnackbarService"/>.</param>
+    /// <param name="title">Name displayed on top of snackbar.</param>
+    /// <param name="message">Message inside the snackbar.</param>
+    /// <param name="icon">Additional icon on the left.</param>
+    public static void Show(this ISnackbarService snackbarService, string title, string message, IconElement icon)
+    { snackbarService.Show(title, message, ControlAppearance.Secondary, icon, snackbarService.DefaultTimeOut); }
+
+    /// <summary>
+    /// Shows the snackbar. If it is already visible, firstly hides it for a moment, changes its content, and then shows
+    /// it again.
+    /// </summary>
+    /// <param name="snackbarService">The <see cref="ISnackbarService"/>.</param>
+    /// <param name="title">Name displayed on top of snackbar.</param>
+    /// <param name="message">Message inside the snackbar.</param>
+    /// <param name="timeout">The time after which the snackbar should disappear.</param>
+    public static void Show(this ISnackbarService snackbarService, string title, string message, TimeSpan timeout)
+    { snackbarService.Show(title, message, ControlAppearance.Secondary, null, timeout); }
+
+    /// <summary>
+    /// Shows the snackbar. If it is already visible, firstly hides it for a moment, changes its content, and then shows
+    /// it again.
+    /// </summary>
+    /// <param name="snackbarService">The <see cref="ISnackbarService"/>.</param>
+    /// <param name="title">Name displayed on top of snackbar.</param>
+    /// <param name="message">Message inside the snackbar.</param>
+    /// <param name="Appearance">Display style.</param>
+    /// <param name="timeout">The time after which the snackbar should disappear.</param>
+    public static void Show(
+        this ISnackbarService snackbarService,
+        string title,
+        string message,
+        ControlAppearance appearance,
+        TimeSpan timeout)
+    { snackbarService.Show(title, message, appearance, null, timeout); }
+
+    /// <summary>
+    /// Shows the snackbar. If it is already visible, firstly hides it for a moment, changes its content, and then shows
+    /// it again.
+    /// </summary>
+    /// <param name="snackbarService">The <see cref="ISnackbarService"/>.</param>
+    /// <param name="title">Name displayed on top of snackbar.</param>
+    /// <param name="message">Message inside the snackbar.</param>
+    /// <param name="icon">Additional icon on the left.</param>
+    /// <param name="timeout">The time after which the snackbar should disappear.</param>
+    public static void Show(
+        this ISnackbarService snackbarService,
+        string title,
+        string message,
+        IconElement icon,
+        TimeSpan timeout)
+    { snackbarService.Show(title, message, ControlAppearance.Secondary, icon, timeout); }
+}