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AssemblyName.GetPublicKey Method

Gets the public key of the assembly.

Namespace:  System.Reflection
Assembly:  mscorlib (in mscorlib.dll)

public byte[] GetPublicKey()

Return Value

Type: System.Byte[]
A byte array that contains the public key of the assembly.


A public key was provided (for example, by using the SetPublicKey method), but no public key token was provided.

The following example emits a dynamic assembly and saves it to the current directory. When the assembly is created, the SetPublicKey method is used to give the assembly a public key. The GetPublicKey method is then used to retrieve the public key, which is displayed to the console.

using System;
using System.Reflection;
using System.Threading;
using System.IO;
using System.Globalization;
using System.Reflection.Emit;
using System.Configuration.Assemblies;
using System.Text;

public class AssemblyName_CodeBase
   public static void MakeAssembly(AssemblyName myAssemblyName, string fileName)
      // Get the assembly builder from the application domain associated with the current thread.
      AssemblyBuilder myAssemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.RunAndSave);
      // Create a dynamic module in the assembly.
      ModuleBuilder myModuleBuilder = myAssemblyBuilder.DefineDynamicModule("MyModule", fileName);
      // Create a type in the module.
      TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("MyType");
      // Create a method called 'Main'.
      MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("Main", MethodAttributes.Public | MethodAttributes.HideBySig |
         MethodAttributes.Static, typeof(void), null);
      // Get the Intermediate Language generator for the method.
      ILGenerator myILGenerator = myMethodBuilder.GetILGenerator();
      // Use the utility method to generate the IL instructions that print a string to the console.
      myILGenerator.EmitWriteLine("Hello World!");
      // Generate the 'ret' IL instruction.
      // End the creation of the type.
      // Set the method with name 'Main' as the entry point in the assembly.

   public static void Main()
      // Create a dynamic assembly with name 'MyAssembly' and build version ''.
      AssemblyName myAssemblyName = new AssemblyName();
      // Set the codebase to the physical directory were the assembly resides.
      myAssemblyName.CodeBase = Directory.GetCurrentDirectory();
      // Set the culture information of the assembly to 'English-American'.
      myAssemblyName.CultureInfo = new CultureInfo("en-US");
      // Set the hash algoritm to 'SHA1'.
      myAssemblyName.HashAlgorithm = AssemblyHashAlgorithm.SHA1;
      myAssemblyName.VersionCompatibility = AssemblyVersionCompatibility.SameProcess;
      myAssemblyName.Flags = AssemblyNameFlags.PublicKey;
      // Provide this assembly with a strong name.
      myAssemblyName.KeyPair = new StrongNameKeyPair(File.Open("KeyPair.snk", FileMode.Open, FileAccess.Read));
      myAssemblyName.Name = "MyAssembly";
      myAssemblyName.Version = new Version("");
      MakeAssembly(myAssemblyName, "MyAssembly.exe");

      // Get the assemblies loaded in the current application domain.
      Assembly[] myAssemblies = Thread.GetDomain().GetAssemblies();

      // Get the dynamic assembly named 'MyAssembly'. 
      Assembly myAssembly = null;
      for(int i = 0; i < myAssemblies.Length; i++)
         if(String.Compare(myAssemblies[i].GetName().Name, "MyAssembly") == 0)
            myAssembly = myAssemblies[i];

      // Display the full assembly information to the console.
      if(myAssembly != null)
         Console.WriteLine("\nDisplaying the full assembly name.\n");
         Console.WriteLine("\nDisplaying the public key.\n");
         byte []pk;
         pk = myAssembly.GetName().GetPublicKey();
 	     for (int i=0;i<pk.GetLength(0);i++)
 		    Console.Write ("{0:x2}", pk[i]);
         Console.WriteLine("\nDisplaying the public key token.\n");
         byte []pt;
         pt = myAssembly.GetName().GetPublicKeyToken();
         for (int i=0;i<pt.GetLength(0);i++)
 		    Console.Write ("{0:x2}", pt[i]);

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.