WPF 对控件截图

突然需要一个Logo,找又找不到，就自己做喽，首先想到的是ps,简单方便，转念一想，wpf搞这个不是很简单么？直接弄做好，截图一下不就行了。。。

开工了，先在iconfont上找了个图标：

是这样的

然后取名：WPF开发者

然后新建一个工程，主界面就是这样了：

点击截图按钮，对包含图标和字体的Grid截图，保存成png，透明背景的哦

窗体代码：

<Window x:Class="WPFDemos.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:WPFDemos"mc:Ignorable="d"x:Name="widnow"WindowStartupLocation="CenterScreen"UseLayoutRounding="True"Background="#3e3e3e"Title="截图示例" Height="300" Width="500"><Grid><Grid x:Name="target" HorizontalAlignment="Center" VerticalAlignment="Center" Background="Transparent"><StackPanel Orientation="Horizontal" Margin="5 0" ><Image x:Name="str" Width="32" Height="32" Source="/vs.png" Margin="5 0"/><TextBlock Text="WPF开发者" VerticalAlignment="Center" Foreground="White" FontSize="25" FontWeight="Bold" FontFamily="Courier New"/></StackPanel></Grid><Button HorizontalAlignment="Right" VerticalAlignment="Center" Foreground="White" Padding="10" Click="Button_Click" Background="Transparent" Margin="50" Content="截图"/></Grid>
</Window>

窗体后台代码：

using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;namespace WPFDemos
{public partial class MainWindow : Window{public MainWindow(){InitializeComponent();}private void Button_Click(object sender, RoutedEventArgs e){DrawingVisual drawingVisual = new DrawingVisual();using (DrawingContext context = drawingVisual.RenderOpen()){VisualBrush brush = new VisualBrush(target) { Stretch = Stretch.None };context.DrawRectangle(brush, null, new Rect(0, 0, target.ActualWidth, target.ActualHeight));context.Close();}RenderTargetBitmap targetBitmap = new RenderTargetBitmap((int)target.ActualWidth, (int)target.ActualHeight, 96d, 96d, PixelFormats.Default);targetBitmap.Render(drawingVisual);PngBitmapEncoder saveEncoder = new PngBitmapEncoder();saveEncoder.Frames.Add(BitmapFrame.Create(targetBitmap));string tempFile = $"d:\\test\\test.png";System.IO.FileStream fs = System.IO.File.Open(tempFile, System.IO.FileMode.OpenOrCreate);saveEncoder.Save(fs);fs.Close();}}
}

截图后，保存在D盘，截出来是这样的：