How Does Method Inlining Work in C#?

In-depth understanding of function inlining in C#

Function inlining in C# is a compiler optimization technique that replaces a function call with the actual implementation of the function at the call site. This move eliminates the overhead associated with function calls, such as stack frame creation and parameter passing.

Implementation of function inlining in C#

Traditionally, C# does not support inline functions. However, in .NET 4.5, the common language runtime (CLR) introduced the ability to suggest inlining using MethodImplOptions.AggressiveInlining. The syntax of the inline function is as follows:

<code class="language-csharp">using System.Runtime.CompilerServices;

...

[MethodImpl(MethodImplOptions.AggressiveInlining)]
void MyMethod(...)</code>

By applying this attribute to a method, you tell the compiler that you want it to inline the function whenever possible. The compiler will then make a decision based on factors such as the function's size and complexity, call graph, and platform-specific limitations.

Notes on anonymous methods and Lambda expressions

Inline functions are different from anonymous methods and Lambda expressions. Anonymous methods and Lambda expressions are used to define inline blocks of code that can be passed as delegates or used in LINQ expressions. Although they achieve a similar goal of executing code at the point of use, they are not the same as inline functions.

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