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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.security.suppressunmanagedcodesecurityattribute below:

SuppressUnmanagedCodeSecurityAttribute Class (System.Security) | Microsoft Learn

Allows managed code to call into unmanaged code without a stack walk. This class cannot be inherited.

public ref class SuppressUnmanagedCodeSecurityAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Interface | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
public sealed class SuppressUnmanagedCodeSecurityAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Interface | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
public sealed class SuppressUnmanagedCodeSecurityAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Interface | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class SuppressUnmanagedCodeSecurityAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Interface | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)>]
type SuppressUnmanagedCodeSecurityAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Interface | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)>]
type SuppressUnmanagedCodeSecurityAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Interface | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type SuppressUnmanagedCodeSecurityAttribute = class
    inherit Attribute

Public NotInheritable Class SuppressUnmanagedCodeSecurityAttribute
Inherits Attribute

Inheritance

SuppressUnmanagedCodeSecurityAttribute

Attributes

Important

Partially trusted code is no longer supported. This attribute has no effect in .NET Core.

Caution

Use this attribute with extreme care. Incorrect use can create security weaknesses.

This attribute can be applied to methods that want to call into native code without incurring the performance loss of a run-time security check when doing so. The stack walk performed when calling unmanaged code is omitted at run time, resulting in substantial performance savings. Using this attribute in a class applies it to all contained methods.

Generally, whenever managed code calls into unmanaged code (by PInvoke or COM interop into native code), there is a demand for the UnmanagedCode permission to ensure all callers have the necessary permission to allow this. By applying this explicit attribute, developers can suppress the demand at run time. The developer must take responsibility for assuring that the transition into unmanaged code is sufficiently protected by other means. The demand for the UnmanagedCode permission will still occur at link time. For example, if function A calls function B and function B is marked with SuppressUnmanagedCodeSecurityAttribute, function A will be checked for unmanaged code permission during just-in-time compilation, but not subsequently during run time.

This attribute is only effective when applied to PInvoke methods (or classes that contain PInvoke methods) or the definition of an interface through which interop calls will be made. It will be ignored in all other contexts.

This attribute is useful for implementing a class that provides access to system resources through unmanaged code. Code that does not have permission to access unmanaged code can call a class with this attribute to access unmanaged code. This is only safe if the writer of the class with this attribute has programmed the class to be secure. If not, this attribute is dangerous and can allow the code that uses it to be misused.

This is not a declarative security attribute, but a regular attribute (it derives from Attribute, not SecurityAttribute).

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• Extending Metadata Using Attributes

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