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Migrate to .NET 9

Recipe IDOpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.UpgradeToDotNet9

ArtifactOpenRewrite.Recipes.CSharp.Migration.Dotnet

Migrate C# projects to .NET 9, applying necessary API changes. Includes all .NET 7 and .NET 8 migration steps. See https://learn.microsoft.com/en-us/dotnet/core/compatibility/9.0.

Composite recipeOpenRewritecsharpdotnetmigrationModerne Proprietary License

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Definition

Recipes42

42 recipes

• Migrate to .NET 8
• Change .NET target framework
• Upgrade NuGet package version
• Upgrade NuGet package version
• Upgrade NuGet package version
• Upgrade NuGet package version
• Upgrade NuGet package version
• Ensure csproj attestation
• Use Volatile.Read/Write (SYSLIB0054)
• Use X509CertificateLoader (SYSLIB0057)
• Use MapStaticAssets()
• Delete method argument
• Find LINQ ambiguities introduced by .NET 9 IAsyncEnumerable extensions
• Find AuthenticationManager usage (SYSLIB0009)
• Find BinaryFormatter usage (removed in .NET 9)
• Find BinaryReader.ReadString behavior change
• Find EnumConverter constructor validation change
• Find HttpListenerRequest.UserAgent nullable change
• Find InMemoryDirectoryInfo rootDir prepend change
• Find IncrementingPollingCounter async callback change
• Find JsonSerializer.Deserialize nullable JsonDocument change
• Find RuntimeHelpers.GetSubArray return type change
• Find SafeEvpPKeyHandle.DuplicateHandle up-ref change
• Find ServicePointManager usage (SYSLIB0014)
• Find obsolete X509Certificate2/X509Certificate constructors (SYSLIB0057)
• Find ZipArchive.CreateEntry with CompressionLevel (bit flag change)
• Find ZipArchiveEntry name/comment UTF-8 encoding change
• Find HttpClientHandler usage (HttpClientFactory default change)
• Find synchronous ExecuteUpdate/ExecuteDelete (EF Core 9)
• Find Swashbuckle usage (ASP.NET Core 9 built-in OpenAPI)
• Migrate Swashbuckle to built-in OpenAPI
• Find implicit authentication default scheme (ASP.NET Core 9)
• Use LINQ CountBy()
• Use Task.CompletedTask
• Remove ConfigureAwait(false)
• Use System.Threading.Lock for lock fields
• Use LINQ AggregateBy()
• Use LINQ Index()
• Use Frozen collections instead of Immutable
• Use \e escape sequence
• Find non-generic JsonStringEnumConverter
• Find IDistributedCache usage (HybridCache in .NET 9)

Usage

Run this recipe

In order to run C# recipes, you will need to use the Moderne CLI.

Once the CLI is installed, you can install this C# recipe package by running the following command:

Install the recipe package

mod config recipes nuget install OpenRewrite.Recipes.CSharp.Migration.Dotnet

Then, you can run the recipe via:

Run the recipe

mod run . --recipe OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.UpgradeToDotNet9