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SafeHandle.DangerousGetHandle Method

Returns the value of the handle field.

Namespace:  System.Runtime.InteropServices
Assemblies:   mscorlib (in mscorlib.dll)
  System.Runtime.Handles (in System.Runtime.Handles.dll)

'Declaration
Public Function DangerousGetHandle As IntPtr

Return Value

Type: System.IntPtr
An IntPtr representing the value of the handle field. If the handle has been marked invalid with SetHandleAsInvalid, this method still returns the original handle value, which can be a stale value.

You can use this method to retrieve the actual handle value from an instance of the SafeHandle derived class. This method is needed for backwards compatibility because many properties in the .NET Framework return IntPtr handle types. IntPtr handle types are platform-specific types used to represent a pointer or a handle.

Caution noteCaution

Using the DangerousGetHandle method can pose security risks because, if the handle has been marked as invalid with SetHandleAsInvalid, DangerousGetHandle still returns the original, potentially stale handle value. The returned handle can also be recycled at any point. At best, this means the handle might suddenly stop working. At worst, if the handle or the resource that the handle represents is exposed to untrusted code, this can lead to a recycling security attack on the reused or returned handle. For example, an untrusted caller can query data on the handle just returned and receive information for an entirely unrelated resource. See the DangerousAddRef and the DangerousRelease methods for more information about using the DangerousGetHandle methodsafely.

.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

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

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