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Marshal.Copy Method (IntPtr, Single[], Int32, Int32)

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

Namespace: System.Runtime.InteropServices
Assembly: mscorlib (in mscorlib.dll)

static void Copy (
	IntPtr source, 
	array<float>^ destination, 
	int startIndex, 
	int length
public static void Copy (
	IntPtr source, 
	float[] destination, 
	int startIndex, 
	int length
public static function Copy (
	source : IntPtr, 
	destination : float[], 
	startIndex : int, 
	length : int



The memory pointer to copy from.


The array to copy to.


The zero-based index into the array where Copy should start.


The number of array elements to copy.

Exception typeCondition


source, destination, startIndex, or length is a null reference (Nothing in Visual Basic).

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 initalize the managed array with the appropriate size before calling the Marshal.Copy method.


This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0