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Readme - Code Samples for Chapter 13, Managed and Unmanaged Memory

Managed and Unmanaged Memory is the last chapter of Part I, which not only shows using the IDisposable interface with the using statement and the new using declaration but also demonstrates using the Span type with managed and unmanaged memory. You can read about using Platform Invoke both with Windows and with Linux environments.

This chapter contains the following code samples:

  • PointerPlayground (using pointers with C#, unsafe keyword)
  • PointerPlayground2 (adding a struct)
  • QuickArray (quick sorting using pointers, stackalloc keyword)
  • ReferenceSemantics (ref return, ref local, ref readonly)
  • SpanSample (the Span type)
  • PlatformInvokeSample (invoking native methods from C#)

For code comments and issues please check Professional C#'s GitHub Repository

Please check my blog csharp.christiannagel.com for additional information for topics covered in the book.

Thank you!

Updates with C# 10 and C# 11

QuickArray

The Main method was replaced with top-level statements, and now uses an unsafe code block.

SpanSample

Marshal.AllocHGlobal has been replaced with NativeMemory.Alloc (.NET 6)

Marshal.FreeHGlobal has been replaced with NativeMemory.Free (.NET 6)

PInvokeSampleLib

Marshal.GetLastWin32Error has been replaced with Marshal.GetLastPInvokeError

With .NET 7, the LibraryImport attribute is used instead of DllImport. This new attribute makes use of a source generator.

See the new .NET 7 sample PInvokeSampleLib. This sample needs these changes:

  • AllowUnsafeBlocks in the project file
  • The attribute LibraryImport instead of DllImport
  • The attribute UnmanagedCalConv instead of the CallingConvention property
  • A partial class with partial methods (instead of extern methods)