New Language Features

• C# 9.0: record classes
• C# 9.0: with expressions
• C# 9.0: primary constructors
• Support for .NET 5 custom calling conventions
• Improved support for Unsafe-intrinsics

UI Improvements

• Dark mode (@tom-englert in #2347)
• .NET bundles and Nuget packages are now directly embedded in the tree view
• Search enabled in NuGet packages
• Added setting highlight the current line in the code view (see #2224, by @DickvdBrink)
• Simple UI language switching support

General

• Support for .NET bundles (see #2191)
• Detect use of csc /deterministic switch
• Improve assembly resolver API to allow async usage
• #2286: Enable server-mode GC in ILSpy
• Building ILSpy for .NET 5 is now possible (see multitargeting.props.template)
• Improved project/solution decompilation (see #2186, by @wwh1004)
• Updated ReadyToRun (see #2238 & #2279, by @cshung)
• Added inline display of CustomDebugInformation table entries in metadata
• Add metadata tree nodes for blob, guid, string and user string heap
• Performance improvements in DataGrid filter (by @tom-englert)
• Adjust fitness calculation for destructors (by @MikeFH in #2344)
• Refactored insertion of search results (by @MikeFH in #2335)
• Align dependencies with Roslyn 3.8.0, see #2173 (affects ICSharpCode.Decompiler NuGet package users)
• Removed the dependency on Humanizer (see #2232 and #2235)

Bug fixes

• Fix #2192: Add support for VB.NET delegate construction
• Fix #2195: foreach loop conversion accidentally removes end container labels
• Fix #2197: .NET 5 RC2: "Analyze/Used By" throws BadImageFormatException
• Fix #2196: Add support for extern local functions.
• Fix #1079: CSharpFormattingOptions.AutoPropertyFormatting has no effect
• Fix #2222: switch-expression does not support implicit conversions.
• #2241: Fix possible NRE in TypeProvider.GetTypeFromReference
• Fix #2233: ResourcesFileTreeNode no longer creates child nodes for BAML files
• Fix #2230: do not emit directly consecutive null propagation operators
• Fix #603: Single element arrays should not span multiple lines
• Fixed crash when loading DLLs with invalid sections in their .deps.json (see #2227, by @bernd5)
• #2278: Implement support for CSharpBinderFlags.InvokeSimpleName
• #2280: Add additional checks to GenerateVariableName
• #2275: Fix exception when assembly does not contain proper MetadataVersion.
• #2260: Fix switch(string) transform: handle empty cases where the C# compiler optimizes out the if
• #2288: Fix decompilation of nullable lifting in expression trees (by @wwh1004)
• PDBGen: Ignore duplicated ILFunctions (see 5a8b488)
• #2314: ILSpy incorrectly resolves a runtime dependency when dll is present in both WindowsDesktop.App and NETCore.App
• #1648 and #2133: Use simple assembly names for KnownThings to allow the resolver to use the relative framework version
• #2349: Use proper ExpressionType with DynamicCompoundAssign.
• #1512: XmlDocumentationProvider Unable to load some XML files to have special characters
• #2342: Do not generate empty names for foreach loop variables.
• #2340: Do not traverse assemblies with load errors in AssemblyList.GetAllAssemblies()
• #2356: Can't navigate if switch language in Analyze panel
• Improved decompilation of rethrow/throw and finally blocks in async methods. (see #1749, #2339 and #2353)