效果圖：

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核心代碼：

class DownloadService{/// <summary> 下載文件 </summary> /// <param name="URL">下載文件地址</param> /// <param name="Filename">下載后的存放地址</param> /// <param name="Prog">用于顯示的進度條</param> /// public static void DownloadFile(string URL, string filename, Action<string, string> percentAction = null, int refreshTime = 1000){float percent = 0;int total = 0;int current = 0;HttpWebRequest Myrq = HttpWebRequest.Create(URL) as HttpWebRequest;Myrq.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705;)";//Myrq.Headers.Add("Token", Token);HttpWebResponse myrp = (HttpWebResponse)Myrq.GetResponse();long totalBytes = myrp.ContentLength;total = (int)totalBytes;Stream st = myrp.GetResponseStream();if (File.Exists(filename)){///生成時間戳int index= filename.LastIndexOf('.');string insertStr="["+ System.Text.RegularExpressions.Regex.Replace(DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"), @"[^\d]*", "") +"]";filename=filename.Insert(index, insertStr);}Stream so = new FileStream(filename, FileMode.Create);long totalDownloadedByte = 0;byte[] by = new byte[1024];int osize = st.Read(by, 0, (int)by.Length);// Todo ：定時刷新進度 if (percentAction != null){Action action = () =>{while (true){Thread.Sleep(refreshTime);// Todo ：返回進度 percentAction(current.ToString(), total.ToString());if (current == total) break;}};Task task = new Task(action);task.Start();}while (osize > 0){totalDownloadedByte = osize + totalDownloadedByte;so.Write(by, 0, osize);current = (int)totalDownloadedByte;osize = st.Read(by, 0, (int)by.Length);percent = (float)totalDownloadedByte / (float)totalBytes * 100;}so.Close();st.Close();}} private string Log { get; set; }private void Download_Click(object sender, RoutedEventArgs e){string URL = @"http://vfx.mtime.cn/Video/2019/03/21/mp4/190321153853126488.mp4";if (string.IsNullOrEmpty(URL)){this.Log = "請求的下載地址是空，請檢查！";logTextBlock.Text = Log;return;}this.updataGrid.Visibility = Visibility.Collapsed;this.progressGrid.Visibility = Visibility.Visible;string save = "C:\\Update";if (!Directory.Exists(save)){Directory.CreateDirectory(save);}string fileName = System.IO.Path.GetFileName(URL);string savePath = System.IO.Path.Combine(save, fileName);Action<string, string> action = (current, total) =>{this.Dispatcher.Invoke(() =>{this.Log = $"正在下載...{FormatBytes(long.Parse(current)).PadLeft(10, ' ')},共計{FormatBytes(long.Parse(total))}";logTextBlock.Text = Log;this.progress.Value = (int)((double.Parse(current) / double.Parse(total)) * 100);if (current == total){this.progress.Value = 100;Task.Delay(1000).ContinueWith(l =>{this.Dispatcher.Invoke(() =>{this.Log = $"下載完成！";logTextBlock.Text = Log;});});var result = MessageBox.Show("是否打開文件？","溫馨提示",MessageBoxButton.OKCancel,MessageBoxImage.Question,MessageBoxResult.OK);if (result==MessageBoxResult.OK){Process.Start(savePath);}this.confirmGrid.Visibility = Visibility.Visible;this.updataGrid.Visibility = Visibility.Collapsed;this.progressGrid.Visibility = Visibility.Collapsed;}});};Task.Run(() =>{DownloadService.DownloadFile(URL, savePath, action, 1000);});}public static string FormatBytes(long bytes){string[] Suffix = { "Byte", "KB", "MB", "GB", "TB" };int i = 0;double dblSByte = bytes;if (bytes > 1024)for (i = 0; (bytes / 1024) > 0; i++, bytes /= 1024)dblSByte = bytes / 1024.0;return String.Format("{0:0.##}{1}", dblSByte, Suffix[i]);}private void Confirm_Click(object sender, RoutedEventArgs e){this.Close();} <Window.Resources><LinearGradientBrush StartPoint="0,0" EndPoint="1,1" x:Key="linear"><GradientStop Offset="0" Color="#FFCF980C"/><GradientStop Offset="0.5" Color="#FFC59416"/><GradientStop Offset="1" Color="#FFBD8902"/></LinearGradientBrush><Style TargetType="Button" ><Setter Property="Cursor" Value="Hand"/><Setter Property="VerticalAlignment" Value="Center"/><Setter Property="HorizontalAlignment" Value="Center"/><Setter Property="Foreground" Value="AliceBlue"/><Setter Property="Background" Value="{StaticResource linear}"/><Setter Property="BorderThickness" Value="0" /><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="Button"><Border BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="0" CornerRadius="5,5,5,5" Background="{StaticResource linear}"><ContentPresenter Content="{TemplateBinding ContentControl.Content}" HorizontalAlignment="Center" VerticalAlignment="Center" ></ContentPresenter></Border></ControlTemplate></Setter.Value> </Setter></Style><Style TargetType="{x:Type ProgressBar}"><Setter Property="FocusVisualStyle" Value="{x:Null}"/><Setter Property="SnapsToDevicePixels" Value="True"/><Setter Property="Height" Value="15"/><Setter Property="Background" Value="{StaticResource linear}"/><Setter Property="FontSize" Value="10"/><Setter Property="Padding" Value="5,0"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="{x:Type ProgressBar}"><Grid Background="#00000000"><Grid.RowDefinitions><RowDefinition Height="Auto"/></Grid.RowDefinitions><VisualStateManager.VisualStateGroups><VisualStateGroup x:Name="CommonStates"><VisualState x:Name="Determinate"/><VisualState x:Name="Indeterminate"><Storyboard RepeatBehavior="Forever"><PointAnimationUsingKeyFrames Storyboard.TargetName="Animation" Storyboard.TargetProperty="(UIElement.RenderTransformOrigin)"><EasingPointKeyFrame KeyTime="0:0:0" Value="0.5,0.5"/><EasingPointKeyFrame KeyTime="0:0:1.5" Value="1.95,0.5"/><EasingPointKeyFrame KeyTime="0:0:3" Value="0.5,0.5"/></PointAnimationUsingKeyFrames></Storyboard></VisualState></VisualStateGroup></VisualStateManager.VisualStateGroups><Grid Height="{TemplateBinding Height}"><Border Background="#000000" CornerRadius="7.5" Opacity="0.05"/><Border BorderBrush="#000000" BorderThickness="1" CornerRadius="7.5" Opacity="0.1"/><Grid Margin="{TemplateBinding BorderThickness}"><Border x:Name="PART_Track"/><Grid x:Name="PART_Indicator" ClipToBounds="True" HorizontalAlignment="Left" ><Grid.ColumnDefinitions><ColumnDefinition x:Name="width1"/><ColumnDefinition x:Name="width2" Width="0"/></Grid.ColumnDefinitions><Grid x:Name="Animation" RenderTransformOrigin="0.5,0.5"><Grid.RenderTransform><TransformGroup><ScaleTransform ScaleY="-1" ScaleX="1"/><SkewTransform AngleY="0" AngleX="0"/><RotateTransform Angle="180"/><TranslateTransform/></TransformGroup></Grid.RenderTransform><Border Background="{TemplateBinding Background}" CornerRadius="7.5"><Viewbox HorizontalAlignment="Left" StretchDirection="DownOnly" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="True"><TextBlock Foreground="#ffffff" SnapsToDevicePixels="True" FontSize="{TemplateBinding FontSize}" VerticalAlignment="Center" Text="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Value,StringFormat={}{0}%}" RenderTransformOrigin="0.5,0.5"><TextBlock.RenderTransform><TransformGroup><ScaleTransform ScaleY="1" ScaleX="-1"/><SkewTransform AngleY="0" AngleX="0"/><RotateTransform Angle="0"/><TranslateTransform/></TransformGroup></TextBlock.RenderTransform></TextBlock></Viewbox></Border><Border BorderBrush="#000000" BorderThickness="1" CornerRadius="7.5" Opacity="0.1"/></Grid></Grid></Grid></Grid></Grid><ControlTemplate.Triggers><Trigger Property="IsEnabled" Value="False"><Setter Property="Background" Value="#c5c5c5"/></Trigger><Trigger Property="IsIndeterminate" Value="true"><Setter TargetName="width1" Property="Width" Value="0.25*"/><Setter TargetName="width2" Property="Width" Value="0.725*"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style></Window.Resources><WindowChrome.WindowChrome><WindowChrome CaptionHeight="50" GlassFrameThickness="1" /></WindowChrome.WindowChrome><Grid><Border CornerRadius="5" BorderThickness="2" BorderBrush="White" Margin="-3" ><Border.Effect><DropShadowEffect ShadowDepth="1" Color="#FF414141" BlurRadius="8"/></Border.Effect></Border><Grid Height="289" Margin="0 0 0 0"><Grid.RowDefinitions><RowDefinition Height="1.5*"/><RowDefinition Height="*"/></Grid.RowDefinitions><Grid Grid.Row="0" Margin="1 1 1 0" Background="{StaticResource linear}"><TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="AliceBlue"><Run Text="發現新版本: V1.2.6" FontSize="24"/> <LineBreak/><LineBreak/><Run Text="1、增加了更新提示" FontSize="16"/><LineBreak/> <Run Text="2、增加了換膚功能" FontSize="16"/><LineBreak/><Run Text="3、優化了部分功能" FontSize="16"/></TextBlock></Grid><Grid Grid.Row="1" x:Name="updataGrid" ><Button Width="171" Height="38" Content="立即升級" Click="Download_Click" /></Grid><Grid Grid.Row="1" x:Name="progressGrid" Visibility="Collapsed"><StackPanel Orientation="Vertical" VerticalAlignment="Center"><ProgressBar Width="520" Height="24" x:Name="progress" /><TextBlock Width="Auto" Text="正在加載中..." Height="38" x:Name="logTextBlock" HorizontalAlignment="Right"Margin="0 4 10 0 " Foreground="#FF646A70" /></StackPanel></Grid><Grid Grid.Row="1" x:Name="confirmGrid" Visibility="Collapsed"><Button Width="171" Height="38" Content="確認關閉" Click="Confirm_Click" /></Grid></Grid></Grid>

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