wpf 对控件进行截图，获取快照

有时候我们项目，在执行某个操作后，会生成一些数据结果，如报表一类的东西，我们需要对结果进行保存，甚至是生成word文档。

那么首先获取到控件快照就最基本的条件。

生成快照的静态方法类

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media.Imaging;namespace MvvmFuncationApp.Model
{public static class ToBitmapTool{/// <summary>/// 截图转换成bitmap/// </summary>/// <param name="element"></param>/// <param name="width">默认控件宽度</param>/// <param name="height">默认控件高度</param>/// <param name="x">默认0</param>/// <param name="y">默认0</param>/// <returns></returns>public static Bitmap ToBitmap(this FrameworkElement element, int width = 0, int height = 0, int x = 0, int y = 0){if (width == 0) width = (int)element.ActualWidth;if (height == 0) height = (int)element.ActualHeight;var rtb = new RenderTargetBitmap(width, height, x, y, System.Windows.Media.PixelFormats.Default);rtb.Render(element);var bit = BitmapSourceToBitmap(rtb);//测试代码DirectoryInfo d = new DirectoryInfo(System.IO.Path.Combine(Directory.GetCurrentDirectory(), "Cache"));if (!d.Exists) d.Create();bit.Save(System.IO.Path.Combine(d.FullName, "控件截图.png"));return bit;}/// <summary>/// BitmapSource转Bitmap/// </summary>/// <param name="source"></param>/// <returns></returns>public static Bitmap BitmapSourceToBitmap(this BitmapSource source){return BitmapSourceToBitmap(source, source.PixelWidth, source.PixelHeight);}/// <summary>/// Convert BitmapSource to Bitmap/// </summary>/// <param name="source"></param>/// <returns></returns>public static Bitmap BitmapSourceToBitmap(this BitmapSource source, int width, int height){Bitmap bmp = null;try{PixelFormat format = PixelFormat.Format24bppRgb;/*set the translate type according to the in param(source)*/switch (source.Format.ToString()){case "Rgb24":case "Bgr24": format = PixelFormat.Format24bppRgb; break;case "Bgra32": format = PixelFormat.Format32bppPArgb; break;case "Bgr32": format = PixelFormat.Format32bppRgb; break;case "Pbgra32": format = PixelFormat.Format32bppArgb; break;}bmp = new Bitmap(width, height, format);BitmapData data = bmp.LockBits(new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size),ImageLockMode.WriteOnly,format);source.CopyPixels(Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride);bmp.UnlockBits(data);}catch{if (bmp != null){bmp.Dispose();bmp = null;}}return bmp;}}
}

添加按钮事件：

        private void BitMapBtn_Click(object sender, RoutedEventArgs e){
　　　　　　　// StudentInfoGrid =======>控件的名称

　　　　　　  ToBitmapTool.ToBitmap(StudentInfoGrid); }
　　　　  }

前台代码：

 <Grid Background="Gray" Name="StudentInfoGrid"><Label Content="学号" Height="28" HorizontalAlignment="Left" Margin="54,23,0,0" Name="labelStudentId" VerticalAlignment="Top" /><TextBox Text="{Binding Student.StudentId}" IsReadOnly="True" Height="23" HorizontalAlignment="Right" Margin="0,27,289,0" Name="textBoxStudentId" VerticalAlignment="Top" Width="120" /><Label Content="姓名" Height="28" HorizontalAlignment="Left" Margin="54,61,0,0" Name="labelStudentName" VerticalAlignment="Top" /><TextBox Text="{Binding Student.StudentName}" IsReadOnly="True" Height="23" HorizontalAlignment="Left" Margin="94,65,0,0" Name="textBoxStudentName" VerticalAlignment="Top" Width="120" /><Label Content="年龄" Height="28" HorizontalAlignment="Left" Margin="54,94,0,0" Name="labelStudentAge" VerticalAlignment="Top" /><TextBox Text="{Binding Student.StudentAge}" IsReadOnly="True" Height="23" HorizontalAlignment="Left" Margin="94,99,0,0" Name="textBoxStudentAge" VerticalAlignment="Top" Width="120" /><Label Content="Email" Height="28" HorizontalAlignment="Left" Margin="50,138,0,0" Name="labelStudentEmail" VerticalAlignment="Top" /><TextBox Text="{Binding Student.StudentEmail}" IsReadOnly="True" Height="23" HorizontalAlignment="Left" Margin="94,141,0,0" Name="textBoxStudentEmail" VerticalAlignment="Top" Width="120" /><Label Content="性别" Height="28" HorizontalAlignment="Left" Margin="57,176,0,0" Name="labelStudentSex" VerticalAlignment="Top" /><TextBox Text="{Binding Student.StudentSex}" IsReadOnly="True" Height="23" HorizontalAlignment="Left" Margin="94,180,0,0" Name="textBoxStudentSex" VerticalAlignment="Top" Width="120" /><Button Command="{Binding ShowCommand}" Content="显示" Height="23" HorizontalAlignment="Left" Margin="345,27,0,0" Name="buttonShow" VerticalAlignment="Top" Width="75" /><Button Content="控件截图" Name="BitMapBtn" Click="BitMapBtn_Click"Width="60" Height="30" Margin="0,30"></Button></Grid>

运行程序 ==》进入项目的debug目录下