{"id":22762,"date":"2019-04-18T15:13:01","date_gmt":"2019-04-18T22:13:01","guid":{"rendered":"https:\/\/devblogs.microsoft.com\/dotnet\/?p=22762"},"modified":"2019-04-19T16:08:04","modified_gmt":"2019-04-19T23:08:04","slug":"announcing-net-core-3-preview-4","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/dotnet\/announcing-net-core-3-preview-4\/","title":{"rendered":"Announcing .NET Core 3 Preview 4"},"content":{"rendered":"

Today, we are announcing .NET Core 3.0 Preview 4. It includes a chart control for Windows Forms, HTTP\/2 support, GC updates to use less memory, support for CPU limits with Docker, the addition of PowerShell in .NET Core SDK Docker container images, and other improvements. If you missed it, check out the improvements we released in .NET Core 3.0 Preview 3<\/a> just last month.<\/p>\n

Download .NET Core 3 Preview 4<\/a> right now on Windows, macOS and Linux.<\/p>\n

ASP.NET Core<\/a> and Entity Framework Core<\/a>\u00a0updates are also being released today.<\/p>\n

The preview version of Visual Studio 2019 Update 1<\/a>\u00a0is highly recommended for .NET Core 3.0 Previews. You can enable .NET Core 3.0 Preview in Visual Studio 2019 (v16.0) by checking `Tools -> Options -> Projects and Solutions -> .NET Core -> Use Previews of the .NET Core SDK.`. Some features of .NET Core 3.0 Previews will not work correctly in Visual Studio 2019 (v16.0).<\/div>\n
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<\/a>WinForms Chart control now available for .NET Core<\/h2>\n

We’ve been hearing that some developers were not able to migrate their existing .NET Framework applications to .NET Core because they had a dependency on the Chart control<\/a>. We’ve fixed that for you!<\/p>\n

The System.Windows.Forms.DataVisualization<\/a> package (which includes the chart control) is now available on NuGet, for .NET Core. You can now include this control in your .NET Core WinForms applications!<\/p>\n

\"Chart<\/p>\n

We ported the System.Windows.Forms.DataVisualization<\/code> library to .NET Core over the last few sprints. The source for the chart control is available at dotnet\/winforms-datavisualization<\/a>, on GitHub. The control was migrated to ease porting to .NET Core 3, but isn’t a component we intend to innovate in. For more advanced data visualization scenarios check out Power BI<\/a>.<\/p>\n

The best way to familiarize yourself with the Charting control is to take a look at our ChartSamples project<\/a>. It contains all existing chart types and can guide you through every step.<\/p>\n

\"Chart<\/p>\n

 <\/p>\n

<\/a>Enabling the Chart control in your .NET project<\/h4>\n

To use the Chart control in your WinForms Core project add a reference to the System.Windows.Forms.DataVisualization NuGet package<\/a>. You can do it by either searching for System.Windows.Forms.DataVisualization<\/code> in the NuGet Package Manager (don’t forget to check Include prerelease<\/strong> box) or by adding the following lines in your .csproj<\/code> file.<\/p>\n

<ItemGroup>\r\n    <PackageReference Include=\"System.Windows.Forms.DataVisualization\" Version=\"1.0.0-prerelease.19212.2\"\/>\r\n<\/ItemGroup><\/pre>\n
Note: The WinForms designer is currently under development and you won’t be able to configure the control from the designer just yet. For now you can either use a code-first approach or you can create and configure the control in a .NET Framework application using the designer and then port your project to .NET Core. Porting guidelines are available in the How to port desktop applications to .NET Core 3.0<\/strong><\/a> post.<\/p>\n
<\/a>WPF<\/h2>\n
The WPF team published more components<\/a> to dotnet\/wpf<\/a> between the Preview 3 and Preview 4 releases.<\/p>\n
The following components are now available as source:<\/p>\n