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IL Disassembler Tutorial
Use the IL Disassembler program in Visual Studio. Add the Windows SDK.IL Disassembler. Much of the .NET Framework is implemented with itself. It is possible to inspect its internals the same way you can look at any program's internals. We inspect the IL Disassembler—but do not disassemble it.IL
Tutorial. Let's get started. If you have installed Visual Studio, browse to your Microsoft Windows SDK folder and look for the cyan thunderbolt in the Tools subfolder. It might be worthwhile to create a shortcut to the program.
DLL files. Because metadata for C# programs is stored in DLL files, you can open DLL files in IL Disassembler and look at the intermediate language embedded in them. EXE files can also be opened.
Next: Let's try the Microsoft .NET Framework itself for a demonstration. In this folder, I find the DLL files the Framework itself uses.
Folder location:
C:\Windows\Microsoft.NET\Framework\v4.0.30319
Open mscorlib. The most commonly used DLL file for the .NET Framework is mscorlib.dll. This file not the complete Framework, but stores the most common and important types. Open your mscorlib.dll file and look at the tree that appears.
Next, use the tree widget to browse into the System.String type. To do this, open System and then browse to System.String. Here, you can see the String type methods available in C# programs and internal methods.Strings
Next: Let's look at the Contains method next. This method searches a string for a specific substring.
Contains. When you click on Contains, you will see a window with a yellow background. This shows the metadata header for this method. It also shows the method body, which is encoded in IL instructions.
Method call. There is a call instruction in Contains. This points to the IndexOf method, which is also available for viewing in IL Disassembler. Contains is simply a wrapper method for IndexOf after all.IndexOf
We can see the ldarg, ldc, call, clt, ceq, and ret instructions. The ldarg instruction pushes one of the formal parameters to the method onto the evaluation stack. The ldc instruction pushes a constant onto the stack.
Call transfers control to the specified method, passing the values on the evaluation stack as arguments. The clt instruction compares two values with a less than operation. Ceq compares two values with an equals operation.
And: Ret simply transfers control to whatever method called the Contains method.
Options. The IL Disassembler tool has several options on it. With "Show bytes", you can see the original bytes that are being interpreted by the disassembler. With "Quote all names", you can put type names inside quotation marks.
Also, with "Statistics", you can see interesting information about the DLL or EXE file you loaded. And with Dump, you can write the IL code from a DLL or EXE to a set of files. There are lots of options.
Summary. The IL Disassembler tool is worth looking into for people who want to learn more about the .NET Framework. It helps to have a basic understanding of the intermediate language, and how the evaluation stack works.
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- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression