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 Ildasm.exe (IL Disassembler).

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");

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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