Marshal.Copy Marshal.Copy Marshal.Copy Marshal.Copy Method

Definition

Copies data from a managed array to an unmanaged memory pointer, or from an unmanaged memory pointer to a managed array.

Overloads

Copy(Single[], Int32, IntPtr, Int32) Copy(Single[], Int32, IntPtr, Int32) Copy(Single[], Int32, IntPtr, Int32) Copy(Single[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed single-precision floating-point number array to an unmanaged memory pointer.

Copy(IntPtr[], Int32, IntPtr, Int32) Copy(IntPtr[], Int32, IntPtr, Int32) Copy(IntPtr[], Int32, IntPtr, Int32) Copy(IntPtr[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed IntPtr array to an unmanaged memory pointer.

Copy(IntPtr, Single[], Int32, Int32) Copy(IntPtr, Single[], Int32, Int32) Copy(IntPtr, Single[], Int32, Int32) Copy(IntPtr, Single[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed single-precision floating-point number array.

Copy(IntPtr, Int64[], Int32, Int32) Copy(IntPtr, Int64[], Int32, Int32) Copy(IntPtr, Int64[], Int32, Int32) Copy(IntPtr, Int64[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 64-bit signed integer array.

Copy(IntPtr, Int32[], Int32, Int32) Copy(IntPtr, Int32[], Int32, Int32) Copy(IntPtr, Int32[], Int32, Int32) Copy(IntPtr, Int32[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 32-bit signed integer array.

Copy(IntPtr, Int16[], Int32, Int32) Copy(IntPtr, Int16[], Int32, Int32) Copy(IntPtr, Int16[], Int32, Int32) Copy(IntPtr, Int16[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 16-bit signed integer array.

Copy(IntPtr, Double[], Int32, Int32) Copy(IntPtr, Double[], Int32, Int32) Copy(IntPtr, Double[], Int32, Int32) Copy(IntPtr, Double[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed double-precision floating-point number array.

Copy(IntPtr, IntPtr[], Int32, Int32) Copy(IntPtr, IntPtr[], Int32, Int32) Copy(IntPtr, IntPtr[], Int32, Int32) Copy(IntPtr, IntPtr[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed IntPtr array.

Copy(IntPtr, Byte[], Int32, Int32) Copy(IntPtr, Byte[], Int32, Int32) Copy(IntPtr, Byte[], Int32, Int32) Copy(IntPtr, Byte[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 8-bit unsigned integer array.

Copy(Int64[], Int32, IntPtr, Int32) Copy(Int64[], Int32, IntPtr, Int32) Copy(Int64[], Int32, IntPtr, Int32) Copy(Int64[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 64-bit signed integer array to an unmanaged memory pointer.

Copy(Int32[], Int32, IntPtr, Int32) Copy(Int32[], Int32, IntPtr, Int32) Copy(Int32[], Int32, IntPtr, Int32) Copy(Int32[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 32-bit signed integer array to an unmanaged memory pointer.

Copy(Int16[], Int32, IntPtr, Int32) Copy(Int16[], Int32, IntPtr, Int32) Copy(Int16[], Int32, IntPtr, Int32) Copy(Int16[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 16-bit signed integer array to an unmanaged memory pointer.

Copy(IntPtr, Char[], Int32, Int32) Copy(IntPtr, Char[], Int32, Int32) Copy(IntPtr, Char[], Int32, Int32) Copy(IntPtr, Char[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed character array.

Copy(Double[], Int32, IntPtr, Int32) Copy(Double[], Int32, IntPtr, Int32) Copy(Double[], Int32, IntPtr, Int32) Copy(Double[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed double-precision floating-point number array to an unmanaged memory pointer.

Copy(Char[], Int32, IntPtr, Int32) Copy(Char[], Int32, IntPtr, Int32) Copy(Char[], Int32, IntPtr, Int32) Copy(Char[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed character array to an unmanaged memory pointer.

Copy(Byte[], Int32, IntPtr, Int32) Copy(Byte[], Int32, IntPtr, Int32) Copy(Byte[], Int32, IntPtr, Int32) Copy(Byte[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 8-bit unsigned integer array to an unmanaged memory pointer.

Copy(Single[], Int32, IntPtr, Int32) Copy(Single[], Int32, IntPtr, Int32) Copy(Single[], Int32, IntPtr, Int32) Copy(Single[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed single-precision floating-point number array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <float> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (float[] source, int startIndex, IntPtr destination, int length);
static member Copy : single[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Single(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Single[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, startIndex, destination, or length is null.

Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(IntPtr[], Int32, IntPtr, Int32) Copy(IntPtr[], Int32, IntPtr, Int32) Copy(IntPtr[], Int32, IntPtr, Int32) Copy(IntPtr[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed IntPtr array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <IntPtr> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr[] source, int startIndex, IntPtr destination, int length);
static member Copy : nativeint[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As IntPtr(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
IntPtr[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Remarks

You can use this method to copy a subset of a one-dimensional managed IntPtr array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(IntPtr, Single[], Int32, Int32) Copy(IntPtr, Single[], Int32, Int32) Copy(IntPtr, Single[], Int32, Int32) Copy(IntPtr, Single[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed single-precision floating-point number array.

public:
 static void Copy(IntPtr source, cli::array <float> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, float[] destination, int startIndex, int length);
static member Copy : nativeint * single[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Single(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Single[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(IntPtr, Int64[], Int32, Int32) Copy(IntPtr, Int64[], Int32, Int32) Copy(IntPtr, Int64[], Int32, Int32) Copy(IntPtr, Int64[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 64-bit signed integer array.

public:
 static void Copy(IntPtr source, cli::array <long> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, long[] destination, int startIndex, int length);
static member Copy : nativeint * int64[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Long(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Int64[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        Int64[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            Int64[] managedArray2 = new Int64[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Int64() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Int64

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to thesource parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(IntPtr, Int32[], Int32, Int32) Copy(IntPtr, Int32[], Int32, Int32) Copy(IntPtr, Int32[], Int32, Int32) Copy(IntPtr, Int32[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 32-bit signed integer array.

public:
 static void Copy(IntPtr source, cli::array <int> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, int[] destination, int startIndex, int length);
static member Copy : nativeint * int[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Integer(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Int32[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        int[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            int[] managedArray2 = new int[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Integer() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Integer

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(IntPtr, Int16[], Int32, Int32) Copy(IntPtr, Int16[], Int32, Int32) Copy(IntPtr, Int16[], Int32, Int32) Copy(IntPtr, Int16[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 16-bit signed integer array.

public:
 static void Copy(IntPtr source, cli::array <short> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, short[] destination, int startIndex, int length);
static member Copy : nativeint * int16[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Short(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Int16[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        short[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            short[] managedArray2 = new short[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Short() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Short

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(IntPtr, Double[], Int32, Int32) Copy(IntPtr, Double[], Int32, Int32) Copy(IntPtr, Double[], Int32, Int32) Copy(IntPtr, Double[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed double-precision floating-point number array.

public:
 static void Copy(IntPtr source, cli::array <double> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, double[] destination, int startIndex, int length);
static member Copy : nativeint * double[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Double(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Double[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        double[] managedArray = { 0.1, 0.2, 0.3, 0.4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            double[] managedArray2 = new double[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Double() = {0.1, 0.2, 0.3, 0.4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Double

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(IntPtr, IntPtr[], Int32, Int32) Copy(IntPtr, IntPtr[], Int32, Int32) Copy(IntPtr, IntPtr[], Int32, Int32) Copy(IntPtr, IntPtr[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed IntPtr array.

public:
 static void Copy(IntPtr source, cli::array <IntPtr> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, IntPtr[] destination, int startIndex, int length);
static member Copy : nativeint * nativeint[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As IntPtr(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
IntPtr[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Therefore, the unmanaged data that corresponds to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling the Marshal.Copy method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(IntPtr, Byte[], Int32, Int32) Copy(IntPtr, Byte[], Int32, Int32) Copy(IntPtr, Byte[], Int32, Int32) Copy(IntPtr, Byte[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed 8-bit unsigned integer array.

public:
 static void Copy(IntPtr source, cli::array <System::Byte> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, byte[] destination, int startIndex, int length);
static member Copy : nativeint * byte[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Byte(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Byte[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        byte[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            byte[] managedArray2 = new byte[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Byte() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Byte

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(Int64[], Int32, IntPtr, Int32) Copy(Int64[], Int32, IntPtr, Int32) Copy(Int64[], Int32, IntPtr, Int32) Copy(Int64[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 64-bit signed integer array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <long> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (long[] source, int startIndex, IntPtr destination, int length);
static member Copy : int64[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Long(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Int64[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, startIndex, destination, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        Int64[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            Int64[] managedArray2 = new Int64[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Int64() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Int64

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(Int32[], Int32, IntPtr, Int32) Copy(Int32[], Int32, IntPtr, Int32) Copy(Int32[], Int32, IntPtr, Int32) Copy(Int32[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 32-bit signed integer array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <int> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (int[] source, int startIndex, IntPtr destination, int length);
static member Copy : int[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Integer(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Int32[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        int[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            int[] managedArray2 = new int[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Integer() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Integer

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(Int16[], Int32, IntPtr, Int32) Copy(Int16[], Int32, IntPtr, Int32) Copy(Int16[], Int32, IntPtr, Int32) Copy(Int16[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 16-bit signed integer array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <short> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (short[] source, int startIndex, IntPtr destination, int length);
static member Copy : int16[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Short(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Int16[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, startIndex, destination, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        short[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            short[] managedArray2 = new short[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Short() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Short

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(IntPtr, Char[], Int32, Int32) Copy(IntPtr, Char[], Int32, Int32) Copy(IntPtr, Char[], Int32, Int32) Copy(IntPtr, Char[], Int32, Int32)

Copies data from an unmanaged memory pointer to a managed character array.

public:
 static void Copy(IntPtr source, cli::array <char> ^ destination, int startIndex, int length);
[System.Security.SecurityCritical]
public static void Copy (IntPtr source, char[] destination, int startIndex, int length);
static member Copy : nativeint * char[] * int * int -> unit
Public Shared Sub Copy (source As IntPtr, destination As Char(), startIndex As Integer, length As Integer)

Parameters

source
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy from.

destination
Char[]

The array to copy to.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the destination array where copying should start.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, destination, startIndex, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

// Remember that the actual size of System.Char in unmanaged memory is 2.
using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        char[] managedArray = new char[1000];
        managedArray[0] = 'a';
        managedArray[1] = 'b';
        managedArray[2] = 'c';
        managedArray[3] = 'd';
        managedArray[999] = 'Z';

        // Initialize unmanaged memory to hold the array.
        // int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;  // Incorrect
        int size = Marshal.SystemDefaultCharSize * managedArray.Length;       // Correct


        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            char[] managedArray2 = new char[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);
            Console.WriteLine("Here is the roundtripped array: {0} {1} {2} {3} {4}",
                               managedArray2[0], managedArray2[1], managedArray2[2], managedArray2[3],
                               managedArray2[999]);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }



    }

}
' Remember that the actual size of System.Char in unmanaged memory is 2.

Imports System
Imports System.Runtime.InteropServices



Module Module1

    Sub Main()
        ' Create a managed array.
        Dim managedArray As Char() = New Char(999) {}
        managedArray(0) = "a"c
        managedArray(1) = "b"c
        managedArray(2) = "c"c
        managedArray(3) = "d"c
        managedArray(999) = "Z"c

        ' Initialize unmanaged memory to hold the array.
        ' Dim size As Integer = Marshal.SizeOf(managedArray[0]) * managedArray.Length;  ' Incorrect
        Dim size As Integer = Marshal.SystemDefaultCharSize * managedArray.Length       ' Correct

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.

            Dim managedArray2 As Char() = New Char(managedArray.Length - 1) {}

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)
            Console.WriteLine("Here is the roundtripped array: {0} {1} {2} {3} {4}", managedArray2(0), managedArray2(1), managedArray2(2), managedArray2(3), managedArray2(999))


            Console.WriteLine("The array was copied to unmanaged memory and back.")
        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)

        End Try
    End Sub
End Module

Remarks

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

See also

Copy(Double[], Int32, IntPtr, Int32) Copy(Double[], Int32, IntPtr, Int32) Copy(Double[], Int32, IntPtr, Int32) Copy(Double[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed double-precision floating-point number array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <double> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (double[] source, int startIndex, IntPtr destination, int length);
static member Copy : double[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Double(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Double[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, startIndex, destination, or length is null.

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        double[] managedArray = { 0.1, 0.2, 0.3, 0.4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            double[] managedArray2 = new double[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Double() = {0.1, 0.2, 0.3, 0.4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Double

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(Char[], Int32, IntPtr, Int32) Copy(Char[], Int32, IntPtr, Int32) Copy(Char[], Int32, IntPtr, Int32) Copy(Char[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed character array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <char> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (char[] source, int startIndex, IntPtr destination, int length);
static member Copy : char[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Char(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Char[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

Examples

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

// Remember that the actual size of System.Char in unmanaged memory is 2.
using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        char[] managedArray = new char[1000];
        managedArray[0] = 'a';
        managedArray[1] = 'b';
        managedArray[2] = 'c';
        managedArray[3] = 'd';
        managedArray[999] = 'Z';

        // Initialize unmanaged memory to hold the array.
        // int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;  // Incorrect
        int size = Marshal.SystemDefaultCharSize * managedArray.Length;       // Correct


        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            char[] managedArray2 = new char[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);
            Console.WriteLine("Here is the roundtripped array: {0} {1} {2} {3} {4}",
                               managedArray2[0], managedArray2[1], managedArray2[2], managedArray2[3],
                               managedArray2[999]);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }



    }

}
' Remember that the actual size of System.Char in unmanaged memory is 2.

Imports System
Imports System.Runtime.InteropServices



Module Module1

    Sub Main()
        ' Create a managed array.
        Dim managedArray As Char() = New Char(999) {}
        managedArray(0) = "a"c
        managedArray(1) = "b"c
        managedArray(2) = "c"c
        managedArray(3) = "d"c
        managedArray(999) = "Z"c

        ' Initialize unmanaged memory to hold the array.
        ' Dim size As Integer = Marshal.SizeOf(managedArray[0]) * managedArray.Length;  ' Incorrect
        Dim size As Integer = Marshal.SystemDefaultCharSize * managedArray.Length       ' Correct

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.

            Dim managedArray2 As Char() = New Char(managedArray.Length - 1) {}

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)
            Console.WriteLine("Here is the roundtripped array: {0} {1} {2} {3} {4}", managedArray2(0), managedArray2(1), managedArray2(2), managedArray2(3), managedArray2(999))


            Console.WriteLine("The array was copied to unmanaged memory and back.")
        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)

        End Try
    End Sub
End Module

Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Copy(Byte[], Int32, IntPtr, Int32) Copy(Byte[], Int32, IntPtr, Int32) Copy(Byte[], Int32, IntPtr, Int32) Copy(Byte[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 8-bit unsigned integer array to an unmanaged memory pointer.

public:
 static void Copy(cli::array <System::Byte> ^ source, int startIndex, IntPtr destination, int length);
[System.Security.SecurityCritical]
public static void Copy (byte[] source, int startIndex, IntPtr destination, int length);
static member Copy : byte[] * int * nativeint * int -> unit
Public Shared Sub Copy (source As Byte(), startIndex As Integer, destination As IntPtr, length As Integer)

Parameters

source
Byte[]

The one-dimensional array to copy from.

startIndex
Int32 Int32 Int32 Int32

The zero-based index in the source array where copying should start.

destination
IntPtr IntPtr IntPtr IntPtr

The memory pointer to copy to.

length
Int32 Int32 Int32 Int32

The number of array elements to copy.

Exceptions

source, startIndex, destination, or length is null.

Examples

The following example copies an array to unmanaged memory by using the Copy(Byte[], Int32, IntPtr, Int32) overload, and then copies the unmanaged array back to managed memory by using the Copy(IntPtr, Byte[], Int32, Int32) overload.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        byte[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = Marshal.AllocHGlobal(size);

        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);

            // Copy the unmanaged array back to another managed array.

            byte[] managedArray2 = new byte[managedArray.Length];

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);

            Console.WriteLine("The array was copied to unmanaged memory and back.");

        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
        


    }

}
Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array.
        Dim managedArray As Byte() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array.
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array.
            Dim managedArray2(managedArray.Length) As Byte

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module


Remarks

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Applies to