MakeArrayType Method (Int32)
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TypeBuilder.MakeArrayType Method (Int32)

Returns a Type object that represents an array of the current type, with the specified number of dimensions.

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

public override Type MakeArrayType(
	int rank


Type: System.Int32

The number of dimensions for the array.

Return Value

Type: System.Type
A Type object that represents a one-dimensional array of the current type.


rank is not a valid array dimension.

The MakeArrayType method provides a way to generate an array type with any possible element type, including generic types.

The following code example creates a dynamic module, an abstract type named Sample, and an abstract method named TestMethod. TestMethod takes a ref parameter (ByRef in Visual Basic) of type Sample, a pointer to type Sample, and an array of type Sample. It returns a two-dimensional array of type Sample. The code example saves the dynamic module to disk, so you can examine it with the MSIL Disassembler (Ildasm.exe).

using System;
using System.Reflection;
using System.Reflection.Emit;
using Microsoft.VisualBasic;

public class Example
    public static void Main()
        // Define a dynamic assembly to contain the sample type. The 
        // assembly will not be run, but only saved to disk, so 
        // AssemblyBuilderAccess.Save is specified. 
        AppDomain myDomain = AppDomain.CurrentDomain;
        AssemblyName myAsmName = new AssemblyName("MakeXxxTypeExample");
        AssemblyBuilder myAssembly = myDomain.DefineDynamicAssembly(

        // An assembly is made up of executable modules. For a single- 
        // module assembly, the module name and file name are the same  
        // as the assembly name.  
        ModuleBuilder myModule = myAssembly.DefineDynamicModule(
            myAsmName.Name + ".dll");

        // Define the sample type.
        TypeBuilder myType = myModule.DefineType(
            TypeAttributes.Public | TypeAttributes.Abstract);

        // Define a method that takes a ref argument of type Sample, 
        // a pointer to type Sample, and an array of Sample objects. The 
        // method returns a two-dimensional array of Sample objects. 
        // To create this method, you need Type objects that represent the 
        // parameter types and the return type. Use the MakeByRefType,  
        // MakePointerType, and MakeArrayType methods to create the Type 
        // objects. 
        Type byRefMyType = myType.MakeByRefType();
        Type pointerMyType = myType.MakePointerType();
        Type arrayMyType = myType.MakeArrayType();
        Type twoDimArrayMyType = myType.MakeArrayType(2);

        // Create the array of parameter types.
        Type[] parameterTypes = {byRefMyType, pointerMyType, arrayMyType};

        // Define the abstract Test method. After you have compiled 
        // and run this code example code, you can use ildasm.exe  
        // to open MakeXxxTypeExample.dll, examine the Sample type, 
        // and verify the parameter types and return type of the 
        // TestMethod method. 
        MethodBuilder myMethodBuilder = myType.DefineMethod(
            MethodAttributes.Abstract | MethodAttributes.Virtual 
                | MethodAttributes.Public,

        // Create the type and save the assembly. For a single-file  
        // assembly, there is only one module to store the manifest  
        // information in. 
        myAssembly.Save(myAsmName.Name + ".dll");

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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