WPF实现可视化控件打印及打印预览

<controls:windowex x:class="suncreate.vipf.client.ui.mapprintpreview"
             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:controls="clr-namespace:suncreate.common.controls;assembly=suncreate.common.controls"
             mc:ignorable="d" 
             d:designheight="700" d:designwidth="1000" loaded="windowex_loaded">
    <window.resources>
        <resourcedictionary>
            <!-- 文字按钮 -->
            <style x:key="stltxtbtn" targettype="{x:type button}">
                <setter property="template">
                    <setter.value>
                        <controltemplate targettype="{x:type button}">
                            <border background="transparent">
                                <border x:name="bd" background="{templatebinding background}" cornerradius="2" padding="{templatebinding padding}">
                                    <textblock x:name="txt" verticalalignment="center" horizontalalignment="center" margin="5 2 5 2"  foreground="white" ><inlineuicontainer>
                                            <contentpresenter />
                                        </inlineuicontainer></textblock>
                                </border>
                            </border>
                            <controltemplate.triggers>
                                <trigger property="ismouseover" value="true">
                                    <setter targetname="bd" property="background" value="#33c4f5"/>
                                </trigger>
                                <trigger property="ispressed" value="true">
                                    <setter targetname="txt" property="fontsize" value="11"/>
                                </trigger>
                            </controltemplate.triggers>
                        </controltemplate>
                    </setter.value>
                </setter>
            </style>
        </resourcedictionary>
    </window.resources>
    <grid>
        <grid.rowdefinitions>
            <rowdefinition height="38"></rowdefinition>
            <rowdefinition></rowdefinition>
        </grid.rowdefinitions>
        <border background="#f0f0f0">
            <button x:name="btnprint" margin="10 0 0 0" background="#1aa4f5" width="60" height="28" horizontalalignment="left" fontsize="12" style="{staticresource stltxtbtn}" click="btnprint_click" content="打印"></button>
        </border>
        <border grid.row="1" background="#a0a0a0">
            <scrollviewer horizontalscrollbarvisibility="auto" verticalscrollbarvisibility="auto">
                <!-- 该border设置成固定a4纸大小 -->
                <border background="#fff" margin="10" width="842" height="595">
                    <!-- 该border可缩放至打印纸 -->
                    <border x:name="border">
                        <image x:name="img" margin="10" stretch="uniform" source="{binding image}" horizontalalignment="left" verticalalignment="top" ></image>
                    </border>
                </border>
            </scrollviewer>
        </border>
    </grid>
</controls:windowex>

using suncreate.common.controls;
using system;
using system.collections.generic;
using system.io;
using system.linq;
using system.printing;
using system.text;
using system.threading.tasks;
using system.windows;
using system.windows.controls;
using system.windows.data;
using system.windows.documents;
using system.windows.input;
using system.windows.media;
using system.windows.media.imaging;
using system.windows.navigation;
using system.windows.shapes;

namespace suncreate.vipf.client.ui
{
    /// <summary>
    /// 地图打印预览
    /// </summary>
    public partial class mapprintpreview : windowex
    {
        /// <summary>
        /// 需要打印预览的控件
        /// </summary>
        private frameworkelement _element;

        private bitmapimage _image;
        public bitmapimage image
        {
            get
            {
                return _image;
            }
            set
            {
                _image = value;
                onpropertychanged("image");
            }
        }

        public mapprintpreview(frameworkelement element)
        {
            initializecomponent();
            this.datacontext = this;
            _element = element;
        }

        private void windowex_loaded(object sender, routedeventargs e)
        {
            int width = (int)_element.actualwidth;
            int height = (int)_element.actualheight;
            rendertargetbitmap rendertargetbitmap = new rendertargetbitmap(width, height, 96, 96, pixelformats.pbgra32);
            rendertargetbitmap.render(_element);
            bmpbitmapencoder bmpbitmapencoder = new bmpbitmapencoder();
            bmpbitmapencoder.frames.add(bitmapframe.create(rendertargetbitmap));
            memorystream memorystream = new memorystream();
            bmpbitmapencoder.save(memorystream);
            memorystream.position = 0;
            bitmapimage bitmapimage = new bitmapimage();
            bitmapimage.begininit();
            bitmapimage.streamsource = memorystream;
            bitmapimage.endinit();
            image = bitmapimage;
        }

        private void btnprint_click(object sender, routedeventargs e)
        {
            printdialog printdialog = new printdialog();
            printdialog.printticket.pageorientation = pageorientation.landscape;
            if (printdialog.showdialog() == true)
            {
                printdialog.printvisual(border, "打印地图");
            }
        }

    }
}