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Minimal working example
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‎CefSharp.OutOfProcess.BrowserProcess/CefSettings.cs‎

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namespace CefSharp.OutOfProcess.BrowserProcess
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{
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/// <summary>
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/// Initialization settings. Many of these and other settings can also configured using command-line switches.
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/// </summary>
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public class CefSettings : CefSettingsBase
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{
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}
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}

‎CefSharp.OutOfProcess.BrowserProcess/CefSharp.OutOfProcess.BrowserProcess.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>WinExe</OutputType>
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<TargetFramework>netcoreapp3.1</TargetFramework>
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<PlatformTarget>x64</PlatformTarget>
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<RuntimeIdentifier>win-x64</RuntimeIdentifier>
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<SelfContained>false</SelfContained>
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<ApplicationManifest>app.manifest</ApplicationManifest>
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<CefSharpBuildAction>NoAction</CefSharpBuildAction>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="CefSharp.Common.NETCore" Version="102.0.90" />
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</ItemGroup>
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</Project>

‎CefSharp.OutOfProcess.BrowserProcess/ChromiumWebBrowser.cs‎

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‎CefSharp.OutOfProcess.BrowserProcess/Program.cs‎

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using System;
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using System.Diagnostics;
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using System.IO;
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using CefSharp.Internals;
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namespace CefSharp.OutOfProcess.BrowserProcess
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{
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public class Program
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{
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public static int Main(string[] args)
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{
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Cef.EnableHighDPISupport();
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//Debugger.Launch();
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var parentProcessId = int.Parse(CommandLineArgsParser.GetArgumentValue(args, "--parentProcessId"));
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var hostHwnd = int.Parse(CommandLineArgsParser.GetArgumentValue(args, "--hostHwnd"));
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var parentProcess = Process.GetProcessById(parentProcessId);
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var settings = new CefSettings()
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{
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//By default CefSharp will use an in-memory cache, you need to specify a Cache Folder to persist data
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CachePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "CefSharp\\OutOfProcessCache")
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};
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Cef.EnableWaitForBrowsersToClose();
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Cef.Initialize(settings);
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var browser = new ChromiumWebBrowser("https://github.com");
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var windowInfo = new WindowInfo();
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windowInfo.SetAsChild(new IntPtr(hostHwnd));
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browser.CreateBrowser(windowInfo);
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parentProcess.WaitForExit();
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Cef.WaitForBrowsersToClose();
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Cef.Shutdown();
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return 0;
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}
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}
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}

‎CefSharp.OutOfProcess.BrowserProcess/app.manifest‎

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<?xml version="1.0" encoding="utf-8"?>
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<asmv1:assembly
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manifestVersion="1.0"
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xmlns="urn:schemas-microsoft-com:asm.v1"
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xmlns:asmv1="urn:schemas-microsoft-com:asm.v1"
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xmlns:asmv2="urn:schemas-microsoft-com:asm.v2"
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xmlns:asmv3="urn:schemas-microsoft-com:asm.v3"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<assemblyIdentity version="1.0.0.0" name="CefSharp.OutOfProcess.BrowserProcess.app" />
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<dependency>
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<dependentAssembly>
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<assemblyIdentity type="Win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"></assemblyIdentity>
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</dependentAssembly>
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</dependency>
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<trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
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<security>
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<requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
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<!-- UAC Manifest Options
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If you want to change the Windows User Account Control level replace the
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requestedExecutionLevel node with one of the following.
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<requestedExecutionLevel level="asInvoker" uiAccess="false" />
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<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
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<requestedExecutionLevel level="highestAvailable" uiAccess="false" />
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Specifying requestedExecutionLevel node will disable file and registry virtualization.
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If you want to utilize File and Registry Virtualization for backward
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compatibility then delete the requestedExecutionLevel node.-->
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<requestedExecutionLevel level="asInvoker" uiAccess="false" />
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</requestedPrivileges>
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</security>
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</trustInfo>
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<asmv3:application>
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<asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
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<dpiAware>true/PM</dpiAware>
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</asmv3:windowsSettings>
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</asmv3:application>
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<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
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<application>
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<!-- A list of all Windows versions that this application is designed to work with.
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Windows will automatically select the most compatible environment.-->
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<!-- Windows 7 -->
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<supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}" />
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<!-- Windows 8 -->
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<supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}" />
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<!-- Windows 8.1 -->
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<supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}" />
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<!-- Windows 10 -->
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<supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
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</application>
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</compatibility>
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</asmv1:assembly>

‎CefSharp.OutOfProcess.Example.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 16
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VisualStudioVersion = 16.0.32510.428
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CefSharp.OutOfProcess.Example", "CefSharp.OutOfProcess.Example\CefSharp.OutOfProcess.Example.csproj", "{A1C85784-7C6F-4C83-9AC4-B3413F32FF31}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CefSharp.OutOfProcess.BrowserProcess", "CefSharp.OutOfProcess.BrowserProcess\CefSharp.OutOfProcess.BrowserProcess.csproj", "{8CB2936D-E12C-4CD2-9044-F264D6F0547B}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{A1C85784-7C6F-4C83-9AC4-B3413F32FF31}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A1C85784-7C6F-4C83-9AC4-B3413F32FF31}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A1C85784-7C6F-4C83-9AC4-B3413F32FF31}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A1C85784-7C6F-4C83-9AC4-B3413F32FF31}.Release|Any CPU.Build.0 = Release|Any CPU
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{8CB2936D-E12C-4CD2-9044-F264D6F0547B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{8CB2936D-E12C-4CD2-9044-F264D6F0547B}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{8CB2936D-E12C-4CD2-9044-F264D6F0547B}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{8CB2936D-E12C-4CD2-9044-F264D6F0547B}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {5E011DD5-7B05-4678-AFFD-5FDEACB52718}
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EndGlobalSection
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EndGlobal

‎CefSharp.OutOfProcess.Example/CefSharp.OutOfProcess.Example.csproj‎

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<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
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<PropertyGroup>
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<OutputType>WinExe</OutputType>
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<TargetFramework>netcoreapp3.1</TargetFramework>
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<UseWindowsForms>true</UseWindowsForms>
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<PlatformTarget>x64</PlatformTarget>
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<RuntimeIdentifier>win-x64</RuntimeIdentifier>
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<SelfContained>false</SelfContained>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="PInvoke.Kernel32" Version="0.7.104" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\CefSharp.OutOfProcess.BrowserProcess\CefSharp.OutOfProcess.BrowserProcess.csproj" />
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</ItemGroup>
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</Project>

‎CefSharp.OutOfProcess.Example/ChromiumHostControl.cs‎

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using System;
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using System.Windows.Forms;
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namespace CefSharp.OutOfProcess.Example
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{
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public class ChromiumHostControl : Control
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{
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public ChromiumHostControl()
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{
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Dock = DockStyle.Fill;
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}
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protected override void OnSizeChanged(EventArgs e)
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{
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base.OnSizeChanged(e);
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}
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}
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}

‎CefSharp.OutOfProcess.Example/HostForm.Designer.cs‎

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‎CefSharp.OutOfProcess.Example/HostForm.cs‎

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using System;
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using System.Diagnostics;
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using System.Windows.Forms;
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namespace CefSharp.OutOfProcess.Example
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{
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public partial class HostForm : Form
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{
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public HostForm()
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{
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InitializeComponent();
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Load += HostFormOnLoad;
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Resize += HostFormOResize;
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}
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private void HostFormOResize(object sender, EventArgs e)
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{
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var hostControl = splitContainer.Panel2.Controls[0];
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hostControl.Size = splitContainer.Panel2.ClientSize;
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}
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private void HostFormOnLoad(object sender, EventArgs e)
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{
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var host = new ChromiumHostControl();
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host.CreateControl();
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var hostHwnd = host.Handle;
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splitContainer.Panel2.Controls.Add(host);
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var currentProcess = Process.GetCurrentProcess();
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var args = $"--parentProcessId={currentProcess.Id} --hostHwnd={hostHwnd.ToInt32()}";
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var browserProcess = Process.Start("CefSharp.OutOfProcess.BrowserProcess.exe", args);
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}
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private void ExitToolStripMenuItemClick(object sender, EventArgs e)
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{
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Close();
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}
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}
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}

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