.NET 6 WPF 利用CefSharp.Wpf.NETCore显示PDF文件

在WPF程序中，我们可以有多种方式显示PDF文件，但是目前发现的性能最好的是CefSharp.Wpf.NETCore。

CefSharp.Wpf.NETCore是一款开源软件。https://github.com/cefsharp/CefSharp。

它提供了WPF版本和WinForm版本，可根据自己的需要进行安装。

本文介绍基于.NET 6 版本的WPF如何使用CefSharp.Wpf.NETCore。

目录

1. 通过NuGet安装CefSharp.Wpf.NETCore

2. 在App.xaml.cs中注册CefSharp.Wpf.NETCore

3. 创建自定义控件

3.1 UCPDFViewer.xaml

3.2 UCPDFViewer.xaml.cs

3.3 ValueConvert-BooleanToVisibilityConverter

3.4 ValueConvert- EnvironmentConverter 

4. 使用自定义控件

---

1. 通过NuGet安装CefSharp.Wpf.NETCore

WPF程序中通过NuGet packages安装CefSharp.Wpf.NETCore。找到自己需要的版本。本文用的版本号是98.1.210

2. 在App.xaml.cs中注册CefSharp.Wpf.NETCore

1. 构造函数中进行初始化

2. 程序退出时销毁

using System;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;
using CefSharp;
using CefSharp.Wpf;namespace MyWpf.UI
{/// <summary>/// Interaction logic for App.xaml/// </summary>public partial class App : Application{#region Ctorpublic App(){SetCefSettings();}#endregionprivate void Application_Exit(object sender, ExitEventArgs e){Cef.Shutdown();}#region CefSharp Settingprivate void SetCefSettings(){
#if ANYCPU//Only required for PlatformTarget of AnyCPUCefRuntime.SubscribeAnyCpuAssemblyResolver();
#endifvar settings = new CefSettings(){//By default CefSharp will use an in-memory cache, you need to specify a Cache Folder to persist dataCachePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "CefSharp\\Cache"),IgnoreCertificateErrors = true};//Example of setting a command line argument//Enables WebRTC// - CEF Doesn't currently support permissions on a per browser basis see https://bitbucket.org/chromiumembedded/cef/issues/2582/allow-run-time-handling-of-media-access// - CEF Doesn't currently support displaying a UI for media access permissions////NOTE: WebRTC Device Id's aren't persisted as they are in Chrome see https://bitbucket.org/chromiumembedded/cef/issues/2064/persist-webrtc-deviceids-across-restartsettings.CefCommandLineArgs.Add("enable-media-stream");//https://peter.sh/experiments/chromium-command-line-switches/#use-fake-ui-for-media-streamsettings.CefCommandLineArgs.Add("use-fake-ui-for-media-stream");//For screen sharing add (see https://bitbucket.org/chromiumembedded/cef/issues/2582/allow-run-time-handling-of-media-access#comment-58677180)settings.CefCommandLineArgs.Add("enable-usermedia-screen-capturing");//Example of checking if a call to Cef.Initialize has already been made, we require this for//our .Net 5.0 Single File Publish example, you don't typically need to perform this check//if you call Cef.Initialze within your WPF App constructor.if (!Cef.IsInitialized){//Perform dependency check to make sure all relevant resources are in our output directory.Cef.Initialize(settings, performDependencyCheck: true, browserProcessHandler: null);}}#endregion}
}

3. 创建自定义控件

创建UCPDFViewer.

3.1 UCPDFViewer.xaml

<UserControl x:Class="MyWpf.UI.Views.CustomControls.UCPDFViewer"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:wpf="clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf" xmlns:cef="clr-namespace:CefSharp;assembly=CefSharp.Core" xmlns:behaviors="http://schemas.microsoft.com/xaml/behaviors"xmlns:vc="clr-namespace:Cortland.Agency.UI.ValueConverters" xmlns:local="clr-namespace:MyWpf.UI.Views.CustomControls"mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"><UserControl.Resources><ResourceDictionary><vc:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/><vc:EnvironmentConverter x:Key="EnvironmentConverter"></vc:EnvironmentConverter></ResourceDictionary></UserControl.Resources><Grid><Grid.RowDefinitions><RowDefinition/><RowDefinition Height="Auto" /></Grid.RowDefinitions><Border Grid.Row="0" BorderBrush="Gray" BorderThickness="0,1"><wpf:ChromiumWebBrowser x:Name="Browser"></wpf:ChromiumWebBrowser></Border><ProgressBar Grid.Row="1" IsIndeterminate="{Binding IsLoading, ElementName=Browser}"HorizontalAlignment="Stretch"VerticalAlignment="Top"Width="Auto" Foreground="{StaticResource ADBrandOrangeBrush}"Height="5" Visibility="{Binding IsLoading, ElementName=Browser, Converter={StaticResource BooleanToVisibilityConverter}}"BorderThickness="0" /></Grid>
</UserControl>

3.2 UCPDFViewer.xaml.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
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;
using CefSharp;
using log4net;namespace MyWpf.UI.Views.CustomControls
{/// <summary>/// Interaction logic for UCPDFViewer.xaml/// </summary>public partial class UCPDFViewer : UserControl{private string inputCurrentFilePath = "";private const int Max_ReTryTime = 3;private int reTryTime;public bool IsLoaded { get; set; }public delegate void LoadFileErrorEventHandler(ActionResultCollection validationRules);public event LoadFileErrorEventHandler LoadFileErrorEvent;private static readonly ILog Log = LogManager.GetLogger(typeof(UCPDFViewer));public UCPDFViewer(){InitializeComponent();this.Loaded -= UCPDFViewer_Loaded;this.Loaded += UCPDFViewer_Loaded;this.Unloaded -= UCPDFViewer_Unloaded;this.Unloaded += UCPDFViewer_Unloaded;}public void UCPDFViewer_Unloaded(object sender, RoutedEventArgs e){try{Log.Debug("UCPDFViewer_Unloaded Start.");if (Browser != null){Browser.Dispose();}}catch (Exception ex){Log.Error($"UCPDFViewer_Unloaded Error.{ex.Message}", ex);}finally{Log.Debug("UCPDFViewer_Unloaded End.");}}private void UCPDFViewer_Loaded(object sender, RoutedEventArgs e){Browser.LoadError -= Browser_LoadError;Browser.Loaded -= Browser_Loaded;Browser.LoadError += Browser_LoadError;Browser.Loaded += Browser_Loaded;}private void Browser_Loaded(object sender, RoutedEventArgs e){reTryTime = 0;this.IsLoaded = true;}/// <summary>/// file://192.168.0.110/AgencyTeam/%23%23Files%23%23/AgencyFiles/02387e57-0cb1-4a3c-a4cc-d5f639f85d70/-001%20FAC-402550.pdf/// </summary>/// <param name="filePath"></param>public void LoadUrl(string filePath){this.IsLoaded = false;string convertedFilePath = filePath;if (!filePath.StartsWith("file://")){convertedFilePath = new Uri(filePath).AbsoluteUri;}inputCurrentFilePath = convertedFilePath;Browser.Load(convertedFilePath);}private void Browser_LoadError(object sender, CefSharp.LoadErrorEventArgs e){if (reTryTime >= Max_ReTryTime){var validationRules = new ActionResultCollection();var wrongData = new ValidationActionResult(){IsValid = false,Message = string.Format(ValidationFailureConstants.JOBTICKET_PDF_LOAD_FAILED, e.ErrorCode.ToString())};validationRules.Add(wrongData);LoadFileErrorEvent?.Invoke(validationRules);IsLoaded = false;return;}reTryTime += 1;switch (e.ErrorCode){case CefSharp.CefErrorCode.None:break;case CefSharp.CefErrorCode.IoPending:break;case CefSharp.CefErrorCode.Failed:break;case CefSharp.CefErrorCode.Aborted:break;case CefSharp.CefErrorCode.InvalidArgument:break;case CefSharp.CefErrorCode.InvalidHandle:break;case CefSharp.CefErrorCode.FileNotFound:LoadUrl(this.inputCurrentFilePath);break;case CefSharp.CefErrorCode.TimedOut:break;case CefSharp.CefErrorCode.FileTooBig:break;case CefSharp.CefErrorCode.Unexpected:break;case CefSharp.CefErrorCode.AccessDenied:break;case CefSharp.CefErrorCode.NotImplemented:break;case CefSharp.CefErrorCode.InsufficientResources:break;case CefSharp.CefErrorCode.OutOfMemory:break;case CefSharp.CefErrorCode.UploadFileChanged:break;case CefSharp.CefErrorCode.SocketNotConnected:break;case CefSharp.CefErrorCode.FileExists:break;case CefSharp.CefErrorCode.FilePathTooLong:break;case CefSharp.CefErrorCode.FileNoSpace:break;case CefSharp.CefErrorCode.FileVirusInfected:break;case CefSharp.CefErrorCode.BlockedByClient:break;case CefSharp.CefErrorCode.NetworkChanged:break;case CefSharp.CefErrorCode.BlockedByAdministrator:break;case CefSharp.CefErrorCode.SocketIsConnected:break;case CefSharp.CefErrorCode.UploadStreamRewindNotSupported:break;case CefSharp.CefErrorCode.ContextShutDown:break;case CefSharp.CefErrorCode.BlockedByResponse:break;case CefSharp.CefErrorCode.CleartextNotPermitted:break;case CefSharp.CefErrorCode.ConnectionClosed:break;case CefSharp.CefErrorCode.ConnectionReset:break;case CefSharp.CefErrorCode.ConnectionRefused:break;case CefSharp.CefErrorCode.ConnectionAborted:break;case CefSharp.CefErrorCode.ConnectionFailed:break;case CefSharp.CefErrorCode.NameNotResolved:break;case CefSharp.CefErrorCode.InternetDisconnected:break;case CefSharp.CefErrorCode.SslProtocolError:break;case CefSharp.CefErrorCode.AddressInvalid:LoadUrl(this.inputCurrentFilePath);break;case CefSharp.CefErrorCode.AddressUnreachable:break;case CefSharp.CefErrorCode.SslClientAuthCertNeeded:break;case CefSharp.CefErrorCode.TunnelConnectionFailed:break;case CefSharp.CefErrorCode.NoSslVersionsEnabled:break;case CefSharp.CefErrorCode.SslVersionOrCipherMismatch:break;case CefSharp.CefErrorCode.SslRenegotiationRequested:break;case CefSharp.CefErrorCode.ProxyAuthUnsupported:break;case CefSharp.CefErrorCode.BadSslClientAuthCert:break;case CefSharp.CefErrorCode.ConnectionTimedOut:break;case CefSharp.CefErrorCode.HostResolverQueueTooLarge:break;case CefSharp.CefErrorCode.SocksConnectionFailed:break;case CefSharp.CefErrorCode.SocksConnectionHostUnreachable:break;case CefSharp.CefErrorCode.AlpnNegotiationFailed:break;case CefSharp.CefErrorCode.SslNoRenegotiation:break;case CefSharp.CefErrorCode.WinsockUnexpectedWrittenBytes:break;case CefSharp.CefErrorCode.SslDecompressionFailureAlert:break;case CefSharp.CefErrorCode.SslBadRecordMacAlert:break;case CefSharp.CefErrorCode.ProxyAuthRequested:break;case CefSharp.CefErrorCode.ProxyConnectionFailed:break;case CefSharp.CefErrorCode.MandatoryProxyConfigurationFailed:break;case CefSharp.CefErrorCode.PreconnectMaxSocketLimit:break;case CefSharp.CefErrorCode.SslClientAuthPrivateKeyAccessDenied:break;case CefSharp.CefErrorCode.SslClientAuthCertNoPrivateKey:break;case CefSharp.CefErrorCode.ProxyCertificateInvalid:break;case CefSharp.CefErrorCode.NameResolutionFailed:break;case CefSharp.CefErrorCode.NetworkAccessDenied:break;case CefSharp.CefErrorCode.TemporarilyThrottled:break;case CefSharp.CefErrorCode.HttpsProxyTunnelResponseRedirect:break;case CefSharp.CefErrorCode.SslClientAuthSignatureFailed:break;case CefSharp.CefErrorCode.MsgTooBig:break;case CefSharp.CefErrorCode.WsProtocolError:break;case CefSharp.CefErrorCode.AddressInUse:break;case CefSharp.CefErrorCode.SslHandshakeNotCompleted:break;case CefSharp.CefErrorCode.SslBadPeerPublicKey:break;case CefSharp.CefErrorCode.SslPinnedKeyNotInCertChain:break;case CefSharp.CefErrorCode.ClientAuthCertTypeUnsupported:break;case CefSharp.CefErrorCode.SslDecryptErrorAlert:break;case CefSharp.CefErrorCode.WsThrottleQueueTooLarge:break;case CefSharp.CefErrorCode.SslServerCertChanged:break;case CefSharp.CefErrorCode.SslUnrecognizedNameAlert:break;case CefSharp.CefErrorCode.SocketSetReceiveBufferSizeError:break;case CefSharp.CefErrorCode.SocketSetSendBufferSizeError:break;case CefSharp.CefErrorCode.SocketReceiveBufferSizeUnchangeable:break;case CefSharp.CefErrorCode.SocketSendBufferSizeUnchangeable:break;case CefSharp.CefErrorCode.SslClientAuthCertBadFormat:break;case CefSharp.CefErrorCode.ICANNNameCollision:break;case CefSharp.CefErrorCode.SslServerCertBadFormat:break;case CefSharp.CefErrorCode.CtSthParsingFailed:break;case CefSharp.CefErrorCode.CtSthIncomplete:break;case CefSharp.CefErrorCode.UnableToReuseConnectionForProxyAuth:break;case CefSharp.CefErrorCode.CtConsistencyProofParsingFailed:break;case CefSharp.CefErrorCode.SslObsoleteCipher:break;case CefSharp.CefErrorCode.WsUpgrade:break;case CefSharp.CefErrorCode.ReadIfReadyNotImplemented:break;case CefSharp.CefErrorCode.NoBufferSpace:break;case CefSharp.CefErrorCode.SslClientAuthNoCommonAlgorithms:break;case CefSharp.CefErrorCode.EarlyDataRejected:break;case CefSharp.CefErrorCode.WrongVersionOnEarlyData:break;case CefSharp.CefErrorCode.Tls13DowngradeDetected:break;case CefSharp.CefErrorCode.SslKeyUsageIncompatible:break;case CefSharp.CefErrorCode.CertCommonNameInvalid:break;case CefSharp.CefErrorCode.CertDateInvalid:break;case CefSharp.CefErrorCode.CertAuthorityInvalid:break;case CefSharp.CefErrorCode.CertContainsErrors:break;case CefSharp.CefErrorCode.CertNoRevocationMechanism:break;case CefSharp.CefErrorCode.CertUnableToCheckRevocation:break;case CefSharp.CefErrorCode.CertRevoked:break;case CefSharp.CefErrorCode.CertInvalid:break;case CefSharp.CefErrorCode.CertWeakSignatureAlgorithm:break;case CefSharp.CefErrorCode.CertNonUniqueName:break;case CefSharp.CefErrorCode.CertWeakKey:break;case CefSharp.CefErrorCode.CertNameConstraintViolation:break;case CefSharp.CefErrorCode.CertValidityTooLong:break;case CefSharp.CefErrorCode.CertificateTransparencyRequired:break;case CefSharp.CefErrorCode.CertSymantecLegacy:break;case CefSharp.CefErrorCode.CertKnownInterceptionBlocked:break;case CefSharp.CefErrorCode.CertEnd:break;case CefSharp.CefErrorCode.InvalidUrl:break;case CefSharp.CefErrorCode.DisallowedUrlScheme:break;case CefSharp.CefErrorCode.UnknownUrlScheme:break;case CefSharp.CefErrorCode.TooManyRedirects:break;case CefSharp.CefErrorCode.UnsafeRedirect:break;case CefSharp.CefErrorCode.UnsafePort:break;case CefSharp.CefErrorCode.InvalidResponse:break;case CefSharp.CefErrorCode.InvalidChunkedEncoding:break;case CefSharp.CefErrorCode.MethodNotSupported:break;case CefSharp.CefErrorCode.UnexpectedProxyAuth:break;case CefSharp.CefErrorCode.EmptyResponse:break;case CefSharp.CefErrorCode.ResponseHeadersTooBig:break;case CefSharp.CefErrorCode.PacScriptFailed:break;case CefSharp.CefErrorCode.RequestRangeNotSatisfiable:break;case CefSharp.CefErrorCode.MalformedIdentity:break;case CefSharp.CefErrorCode.ContentDecodingFailed:break;case CefSharp.CefErrorCode.NetworkIoSuspended:break;case CefSharp.CefErrorCode.SynReplyNotReceived:break;case CefSharp.CefErrorCode.EncodingConversionFailed:break;case CefSharp.CefErrorCode.UnrecognizedFtpDirectoryListingFormat:break;case CefSharp.CefErrorCode.NoSupportedProxies:break;case CefSharp.CefErrorCode.Http2ProtocolError:break;case CefSharp.CefErrorCode.InvalidAuthCredentials:break;case CefSharp.CefErrorCode.UnsupportedAuthScheme:break;case CefSharp.CefErrorCode.EncodingDetectionFailed:break;case CefSharp.CefErrorCode.MissingAuthCredentials:break;case CefSharp.CefErrorCode.UnexpectedSecurityLibraryStatus:break;case CefSharp.CefErrorCode.MisconfiguredAuthEnvironment:break;case CefSharp.CefErrorCode.UndocumentedSecurityLibraryStatus:break;case CefSharp.CefErrorCode.ResponseBodyTooBigToDrain:break;case CefSharp.CefErrorCode.ResponseHeadersMultipleContentLength:break;case CefSharp.CefErrorCode.IncompleteHttp2Headers:break;case CefSharp.CefErrorCode.PacNotInDhcp:break;case CefSharp.CefErrorCode.ResponseHeadersMultipleContentDisposition:break;case CefSharp.CefErrorCode.ResponseHeadersMultipleLocation:break;case CefSharp.CefErrorCode.Http2ServerRefusedStream:break;case CefSharp.CefErrorCode.Http2PingFailed:break;case CefSharp.CefErrorCode.ContentLengthMismatch:break;case CefSharp.CefErrorCode.IncompleteChunkedEncoding:break;case CefSharp.CefErrorCode.QuicProtocolError:break;case CefSharp.CefErrorCode.ResponseHeadersTruncated:break;case CefSharp.CefErrorCode.QuicHandshakeFailed:break;case CefSharp.CefErrorCode.Http2InadequateTransportSecurity:break;case CefSharp.CefErrorCode.Http2FlowControlError:break;case CefSharp.CefErrorCode.Http2FrameSizeError:break;case CefSharp.CefErrorCode.Http2CompressionError:break;case CefSharp.CefErrorCode.ProxyAuthRequestedWithNoConnection:break;case CefSharp.CefErrorCode.Http11Required:break;case CefSharp.CefErrorCode.ProxyHttp11Required:break;case CefSharp.CefErrorCode.PacScriptTerminated:break;case CefSharp.CefErrorCode.InvalidHttpResponse:break;case CefSharp.CefErrorCode.ContentDecodingInitFailed:break;case CefSharp.CefErrorCode.Http2RstStreamNoErrorReceived:break;case CefSharp.CefErrorCode.TooManyRetries:break;case CefSharp.CefErrorCode.Http2StreamClosed:break;case CefSharp.CefErrorCode.HttpResponseCodeFailure:break;case CefSharp.CefErrorCode.QuicCertRootNotKnown:break;case CefSharp.CefErrorCode.CacheMiss:break;case CefSharp.CefErrorCode.CacheReadFailure:break;case CefSharp.CefErrorCode.CacheWriteFailure:break;case CefSharp.CefErrorCode.CacheOperationNotSupported:break;case CefSharp.CefErrorCode.CacheOpenFailure:break;case CefSharp.CefErrorCode.CacheCreateFailure:break;case CefSharp.CefErrorCode.CacheRace:break;case CefSharp.CefErrorCode.CacheChecksumReadFailure:break;case CefSharp.CefErrorCode.CacheChecksumMismatch:break;case CefSharp.CefErrorCode.CacheLockTimeout:break;case CefSharp.CefErrorCode.CacheAuthFailureAfterRead:break;case CefSharp.CefErrorCode.CacheEntryNotSuitable:break;case CefSharp.CefErrorCode.CacheDoomFailure:break;case CefSharp.CefErrorCode.CacheOpenOrCreateFailure:break;case CefSharp.CefErrorCode.InsecureResponse:break;case CefSharp.CefErrorCode.NoPrivateKeyForCert:break;case CefSharp.CefErrorCode.AddUserCertFailed:break;case CefSharp.CefErrorCode.InvalidSignedExchange:break;case CefSharp.CefErrorCode.InvalidWebBundle:break;case CefSharp.CefErrorCode.FtpFailed:break;case CefSharp.CefErrorCode.FtpServiceUnavailable:break;case CefSharp.CefErrorCode.FtpTransferAborted:break;case CefSharp.CefErrorCode.FtpFileBusy:break;case CefSharp.CefErrorCode.FtpSyntaxError:break;case CefSharp.CefErrorCode.FtpCommandNotSupported:break;case CefSharp.CefErrorCode.FtpBadCommandSequence:break;case CefSharp.CefErrorCode.Pkcs12ImportBadPassword:break;case CefSharp.CefErrorCode.Pkcs12ImportFailed:break;case CefSharp.CefErrorCode.ImportCaCertNotCa:break;case CefSharp.CefErrorCode.ImportCertAlreadyExists:break;case CefSharp.CefErrorCode.ImportCaCertFailed:break;case CefSharp.CefErrorCode.ImportServerCertFailed:break;case CefSharp.CefErrorCode.Pkcs12ImportInvalidMac:break;case CefSharp.CefErrorCode.Pkcs12ImportInvalidFile:break;case CefSharp.CefErrorCode.Pkcs12ImportUnsupported:break;case CefSharp.CefErrorCode.KeyGenerationFailed:break;case CefSharp.CefErrorCode.PrivateKeyExportFailed:break;case CefSharp.CefErrorCode.SelfSignedCertGenerationFailed:break;case CefSharp.CefErrorCode.CertDatabaseChanged:break;case CefSharp.CefErrorCode.DnsMalformedResponse:break;case CefSharp.CefErrorCode.DnsServerRequiresTcp:break;case CefSharp.CefErrorCode.DnsServerFailed:break;case CefSharp.CefErrorCode.DnsTimedOut:break;case CefSharp.CefErrorCode.DnsCacheMiss:break;case CefSharp.CefErrorCode.DnsSearchEmpty:break;case CefSharp.CefErrorCode.DnsSortError:break;case CefSharp.CefErrorCode.DnsSecureResolverHostnameResolutionFailed:break;default:break;}}}
}

3.3 ValueConvert-BooleanToVisibilityConverter

    public class BooleanToVisibilityConverter : IValueConverter{#region IValueConverter Memberspublic object Convert(object value, Type targetType, object parameter,CultureInfo culture){if (value is Boolean){bool reverse = GetReverseVisibility(parameter);if (reverse){return ((bool)value) ? Visibility.Collapsed : Visibility.Visible;}return ((bool)value) ? Visibility.Visible : Visibility.Collapsed;}return value;}public object ConvertBack(object value, Type targetType, object parameter,CultureInfo culture){if (value is Visibility){bool reverse = GetReverseVisibility(parameter);if (reverse){return ((Visibility)value) == Visibility.Collapsed;}return ((Visibility)value) == Visibility.Visible;}return value;}#endregion#region Helper Methodsprivate bool GetReverseVisibility(object parameter){if (parameter != null && parameter.ToString().ToLower() == "true"){return true;}return false;}#endregion}

3.4 ValueConvert- EnvironmentConverter 

    public class EnvironmentConverter : IValueConverter{object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture){return Environment.Is64BitProcess ? "x64" : "x86";}object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture){return Binding.DoNothing;}}

4. 使用自定义控件

 xmlns:CustomControls="clr-namespace:Cortland.Agency.UI.Views.CustomControls" <!--<WebBrowser x:Name="webBrowser" Grid.Row="0"/>--><CustomControls:UCPDFViewer x:Name="webBrowser" Grid.Row="0"></CustomControls:UCPDFViewer>

     var fileUrl = new Uri(newFile);webBrowser.LoadUrl(fileUrl.AbsoluteUri);webBrowser.LoadFileErrorEvent -= WebBrowser_LoadFileErrorEvent;webBrowser.LoadFileErrorEvent += WebBrowser_LoadFileErrorEvent;

Track errors when loadin failed. 

private void WebBrowser_LoadFileErrorEvent(ActionResultCollection validationRules){if (validationRules != null && validationRules.HasValidationErrors){this.Dispatcher.Invoke(() =>{var newValudationRules = this.ViewModel.ValidationResults;if (newValudationRules == null){newValudationRules = new ActionResultCollection();}newValudationRules.AddRange(validationRules);this.ViewModel.ValidationResults = newValudationRules;});}}