WPF下载和取消下载功能并显示进度条
作者：互联网
记录一个小案例：下载和取消下载（还可以用事件与委托的形式实现），但是我没有用，我这个比较简单
话不多说直接上案例：
<Window x:Class="XRKAddin.Versions.UpdateVersion"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:XRKAddin.Versions"
mc:Ignorable="d" xmlns:hc="https://handyorg.github.io/handycontrol"
Height="500" Width="400" WindowStartupLocation="CenterScreen" WindowStyle="None"
AllowsTransparency="True" BorderThickness="24" xmlns:wpfanimated="http://wpfanimatedgif.codeplex.com"
Title="关于" ShowInTaskbar="False" ResizeMode = "NoResize" Loaded="Window_Loaded">
<Window.Effect>
<DropShadowEffect BlurRadius="20" Color="#FF858484" Direction="300" ShadowDepth="0" Opacity="0.5"/>
</Window.Effect>
<Border BorderBrush="#0D6FB8" BorderThickness="1" >
<Grid>
<Grid.Background>
<!--<ImageBrush ImageSource="pack://SiteOfOrigin:,,,/Resources/login/cloud.png" Opacity=".1" RenderOptions.CacheInvalidationThresholdMinimum="0.5" RenderOptions.CacheInvalidationThresholdMaximum="2.0" RenderOptions.CachingHint="Cache" Viewport="0,0,157,157" ViewportUnits="Absolute" Stretch="Uniform" TileMode="Tile"/>-->
<ImageBrush ImageSource="../Resources/login/cloud.png" Opacity=".1" RenderOptions.CacheInvalidationThresholdMinimum="0.5" RenderOptions.CacheInvalidationThresholdMaximum="2.0" RenderOptions.CachingHint="Cache" Viewport="0,0,157,157" ViewportUnits="Absolute" Stretch="Uniform" TileMode="Tile"/>
</Grid.Background>
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="400"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal" Background="#D8D8D8" Height="50" hc:WindowAttach.IsDragElement="True">
<!--<Image Source="pack://SiteOfOrigin:,,,/Resources/icon_about.png" Width="18" Height="18" Margin="18,0"/>-->
<Image Source="../Resources/icon_about.png" Width="18" Height="18" Margin="18,0"/>
<TextBlock Text="关于" Height="18"/>
<Button Margin="230,10" Background="#D8D8D8" BorderBrush="#D8D8D8" Click="Close">
<Button.Content>
<!--<Image Source="pack://SiteOfOrigin:,,,/Resources/icon_close.png" Width="12" Height="12"/>-->
<Image Source="../Resources/icon_close.png" Width="12" Height="12"/>
</Button.Content>
</Button>
</StackPanel>
<Grid Grid.Row="1">
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
<RowDefinition Height="40"/>
<RowDefinition Height="40"/>
<RowDefinition Height="105"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="Call-Link" Height="20" FontSize="18" FontWeight="Black" HorizontalAlignment="Center"/>
<TextBlock Grid.Row="1" Name="version" Text="当前版本1.0.1" Height="20" HorizontalAlignment="Center" Foreground="#BDBDBD"/>
<StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Center" Name="panel1">
<!--<MediaElement Name="wait_gif" MediaEnded="MediaElement_MediaEnded" Source="pack://SiteOfOrigin:,,,/Resources/20210730134302.gif" Width="18" Height="18" Margin="10" Opacity="0.5"/>-->
<!--显示gif图片的方式-->
<!--<Image x:Name="image1" wpfanimated:ImageBehavior.AnimatedSource="pack://SiteOfOrigin:,,,/Resources/20210730134302.gif" wpfanimated:ImageBehavior.RepeatBehavior="0x"
wpfanimated:ImageBehavior.AnimateInDesignMode="True" wpfanimated:ImageBehavior.AutoStart="True" Height="18" Width="18" Margin="10"/>-->
<Image x:Name="image1" wpfanimated:ImageBehavior.AnimatedSource="../Resources/gengxin1.gif" wpfanimated:ImageBehavior.RepeatBehavior="0x"
wpfanimated:ImageBehavior.AnimateInDesignMode="True" wpfanimated:ImageBehavior.AutoStart="True" Height="18" Width="18" Margin="10"/>
<!--<Image x:Name="image" Source="pack://SiteOfOrigin:,,,/Resources/gengxin.png" Width="18" Height="18" Margin="10" Visibility="Collapsed"/>-->
<Image x:Name="image" Source="../Resources/gengxin.png" Width="18" Height="18" Margin="10" Visibility="Collapsed"/>
<TextBlock x:Name="inspect" Text="正在检查更新" Height="20" HorizontalAlignment="Center" />
</StackPanel>
<Grid Grid.Row="3">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="350"/>
</Grid.ColumnDefinitions>
<StackPanel Orientation="Horizontal">
<Button Grid.Column="0" Name="cancel" Width="80" Height="40" Margin="80,0,0,0" Content="取消" Style="{StaticResource ButtonPrimary}" Click="Cancel_Click" Visibility="Collapsed"/>
<Button Grid.Column="1" Name="confirm" Width="80" Height="40" Margin="140,0,0,0" Content="更新" Style="{StaticResource ButtonPrimary}" Click="Confirm_Click" Visibility="Visible"/>
</StackPanel>
</Grid>
<Grid Grid.Row="4">
<StackPanel Margin="20,20,20,0">
<ProgressBar x:Name="progressbar" Style="{DynamicResource ProgressBarSuccess}" Width="250" Visibility="Collapsed"></ProgressBar>
<!--<TextBlock x:Name="label1" Text="ProgressBarSuccess" Margin="30,0"></TextBlock>-->
</StackPanel>
<!--<Image Source="pack://SiteOfOrigin:,,,/Resources/bg.png"/>-->
<Image Source="../Resources/bg.png"/>
<StackPanel Margin="70">
<!--<Image Source="pack://SiteOfOrigin:,,,/Resources/logo.png" Width="102" Height="19"/>-->
<Image Source="../Resources/logo.png" Width="102" Height="19"/>
</StackPanel>
<StackPanel>
<TextBlock Height="20" HorizontalAlignment="Center" Margin="0,100">
<Hyperlink Name="link" NavigateUri="http://www.sunmooc.cn/" ToolTip="欢迎访问，向日葵教育" Click="Hyperlink_Click">www.sunmooc.cn</Hyperlink>
</TextBlock>
</StackPanel>
</Grid>
</Grid>
</Grid>
</Border>
</Window>
前台页面
public bool DownloadFile(string URL, string fileName, ProgressBar progressBar1)
{
System.IO.Stream stream1 = null;
System.IO.Stream stream2 = null;
try
{
System.Net.HttpWebRequest httpWebRequest1 = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);
System.Net.HttpWebResponse httpWebResponse1 = (System.Net.HttpWebResponse)httpWebRequest1.GetResponse();
long totalLength = httpWebResponse1.ContentLength;
if (progressBar1 != null)
{
progressBar1.Maximum = (int)totalLength;
}
stream1 = httpWebResponse1.GetResponseStream();
stream2 = new System.IO.FileStream(fileName, System.IO.FileMode.Create);
long currentLength = 0;
byte[] by = new byte[1024];
int osize = stream1.Read(by, 0, (int)by.Length);
while (osize > 0)
{
if (isDownload)
{
throw new Exception("手动停止下载！");
}
//WpfApplication.DispatcherHelper.DoEvents();
System.Windows.Forms.Application.DoEvents();
currentLength = osize + currentLength;
stream2.Write(by, 0, osize);
if (progressBar1 != null)
{
progressBar1.Dispatcher.BeginInvoke((ThreadStart)delegate { progressBar1.Value = (int)currentLength; });
//progressBar1.Value = (int)currentLength;
//label1.Text = String.Format("{0} / {1}", BytesToString(currentLength), BytesToString(totalLength));
}
osize = stream1.Read(by, 0, (int)by.Length);
}
stream2.Close();
stream1.Close();
return (currentLength == totalLength);
}
catch
{
isDownload = false;
if (stream1 != null)
stream1.Close();
if (stream2 != null)
stream2.Close();
if (File.Exists(fileName))
{
File.Delete(fileName);
}
return false;
}
finally
{
isDownload = false;
stream2.Close();
stream1.Close();
}
}
后台下载功能
private void Cancel_Click(object sender, RoutedEventArgs e)
{
isDownload = true;
progressbar.Value = 0.0;
progressbar.Visibility = Visibility.Collapsed;
this.confirm.IsEnabled = true;
this.cancel.IsEnabled = false;
}
取消下载按钮
private void Confirm_Click(object sender, RoutedEventArgs e)
{
try
{
cancel.Visibility = Visibility.Visible;
progressbar.Visibility = Visibility.Visible;
// 重新加载按钮样式
confirm.Margin = new Thickness(40, 0, 0, 0);
this.confirm.IsEnabled = false;
this.cancel.IsEnabled = true;
string resu = Tool.Get_cookie(configinfo.callLinkserviceurl + "/version/getReleaseVersion/1", null);
if (resu != "")
{
JObject jo = (JObject)JsonConvert.DeserializeObject(resu);
string code = jo["code"].ToString().ToUpper();
if (code == "200")
{
string url = jo["data"]["downloadUrl"].ToString();
string version = jo["data"]["versionFlag"].ToString();
if (url != null)
{
string filename = AppDomain.CurrentDomain.BaseDirectory + "NewVersion" + version + ".exe";
if (DownloadFile(url, filename, progressbar))
{
MessageBox.Show("下载成功！");
// 将版本号存入json文件中
// Writejson(version);
}
}
}
}
}
catch (Exception)
{
// 更新失败
this.image.Visibility = Visibility.Visible;
this.image1.Visibility = Visibility.Collapsed;
Uri uri = new Uri(@"../Resources/fail.png", UriKind.Relative);
this.image.Source = new BitmapImage(uri);
this.inspect.Text = "更新检查失败";
}
}
下载按钮
标签：string,进度条,--,System,Visibility,stream1,WPF,null,下载 来源： https://www.cnblogs.com/zhao987/p/15119675.html