<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Structure Guid
    Implements IFormattable, IComparable, IComparable(Of Guid), _
    IEquatable(Of Guid)

Dim instance As Guid

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public struct Guid : IFormattable, IComparable, IComparable<Guid>, 
    IEquatable<Guid>

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public value class Guid : IFormattable, IComparable, IComparable<Guid>, 
    IEquatable<Guid>

/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class Guid extends ValueType implements IFormattable, IComparable, 
    IComparable<Guid>, IEquatable<Guid>

JScript admite el uso de estructuras, pero no admite la declaración de estructuras nuevas.

Imports System
Imports System.Runtime.InteropServices

' Guid for the interface IMyInterface.
<Guid("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4")> _
Interface IMyInterface
    Sub MyMethod()
End Interface

' Guid for the coclass MyTestClass.
<Guid("936DA01F-9ABD-4d9d-80C7-02AF85C822A8")> _
Public Class MyTestClass
    Implements IMyInterface
    
    ' Run regasm on this assembly to create .reg and .tlb files.
    ' Reg file can be used to register this coclass in the registry.
    ' Tlb file will be used to do interop.
    Public Sub MyMethod() Implements IMyInterface.MyMethod
    End Sub
    
    Public Shared Sub Main()
        ' Example addresses the following in System.Runtime.InterOpServices.GuidAttribute.
        ' How to specify the attribute on interface/coclass.
        ' Retrieve the GuidAttribute from an interface/coclass.
        ' Value property on GuidAttribute class.
        ' Example addresses the following in System.Guid.
        ' Constructor Guid(string).
        ' Constructor Guid(ByteArray).
        ' Equals.
        ' Operator ==.
        ' CompareTo.
        Dim IMyInterfaceAttribute As Attribute = Attribute.GetCustomAttribute(GetType(IMyInterface), GetType(GuidAttribute))
        
        ' The Value property of GuidAttribute returns a string. 
        System.Console.WriteLine("IMyInterface Attribute: " + CType(IMyInterfaceAttribute, GuidAttribute).Value)
        
        ' Using the string to create a guid.
        Dim myGuid1 As New Guid(CType(IMyInterfaceAttribute, GuidAttribute).Value)
        ' Using a byte array to create a guid.
        Dim myGuid2 As New Guid(myGuid1.ToByteArray())
        
        ' Equals is overridden and so value comparison is done though references are different.
        If myGuid1.Equals(myGuid2) Then
            System.Console.WriteLine("myGuid1 equals myGuid2")
        Else
            System.Console.WriteLine("myGuid1 not equals myGuid2")
        End If 
        ' Equality operator can also be used to determine if two guids have same value.
        If myGuid1.ToString() = myGuid2.ToString() Then
            System.Console.WriteLine("myGuid1 == myGuid2")
        Else
            System.Console.WriteLine("myGuid1 != myGuid2")
        End If
        ' CompareTo returns 0 if the guids have same value.
        If myGuid1.CompareTo(myGuid2) = 0 Then
            System.Console.WriteLine("myGuid1 compares to myGuid2")
        Else
            System.Console.WriteLine("myGuid1 does not compare to myGuid2")
        End If 
        
        System.Console.ReadLine()

        'Output:
        'IMyInterface Attribute: F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4
        'myGuid1 equals myGuid2
        'myGuid1 == myGuid2
        'myGuid1 compares to myGuid2
    End Sub
End Class

using System;
using System.Runtime.InteropServices;

// Guid for the interface IMyInterface.
[Guid("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4")]
interface IMyInterface
{
    void MyMethod();
}

// Guid for the coclass MyTestClass.
[Guid("936DA01F-9ABD-4d9d-80C7-02AF85C822A8")]
public class MyTestClass : IMyInterface
{
    // Run regasm on this assembly to create .reg and .tlb files.
    // Reg file can be used to register this coclass in the registry.
    // Tlb file will be used to do interop.

    public void MyMethod() {}

    public static void Main( string []args )
    {
        // Example addresses the following in System.Runtime.InterOpServices.GuidAttribute.
        // How to specify the attribute on interface/coclass.
        // Retrieve the GuidAttribute from an interface/coclass.
        // Value property on GuidAttribute class.

        // Example addresses the following in System.Guid.
        // Constructor Guid(string).
        // Constructor Guid(ByteArray).
        // Equals.
        // Operator ==.
        // CompareTo.

        Attribute IMyInterfaceAttribute = Attribute.GetCustomAttribute( typeof( IMyInterface ), typeof( GuidAttribute ) );
        
        // The Value property of GuidAttribute returns a string. 
        System.Console.WriteLine( "IMyInterface Attribute: " + ((GuidAttribute)IMyInterfaceAttribute).Value );    

        // Using the string to create a guid.
        Guid myGuid1 = new Guid( ((GuidAttribute)IMyInterfaceAttribute).Value );
        // Using a byte array to create a guid.
        Guid myGuid2 = new Guid ( myGuid1.ToByteArray() );

        // Equals is overridden and so value comparison is done though references are different.
        if ( myGuid1.Equals( myGuid2 ) )
            System.Console.WriteLine( "myGuid1 equals myGuid2" );
        else
            System.Console.WriteLine( "myGuid1 not equals myGuid2" );

        // Equality operator can also be used to determine if two guids have same value.
        if ( myGuid1 == myGuid2 )
            System.Console.WriteLine( "myGuid1 == myGuid2" );
        else
            System.Console.WriteLine( "myGuid1 != myGuid2" );
    
        // CompareTo returns 0 if the guids have same value.
        if ( myGuid1.CompareTo( myGuid2 ) == 0 )
            System.Console.WriteLine( "myGuid1 compares to myGuid2" );
        else
            System.Console.WriteLine( "myGuid1 does not compare to myGuid2" );

        System.Console.ReadLine();

        //Output.
        //IMyInterface Attribute: F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4
        //myGuid1 equals myGuid2
        //myGuid1 == myGuid2
        //myGuid1 compares to myGuid2
    }
}

using namespace System;
using namespace System::Runtime::InteropServices;

// Guid for the interface IMyInterface.

[Guid("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4")]
public interface class IMyInterface
{
public:
   void MyMethod();
};


// Guid for the coclass MyTestClass.

[Guid("936DA01F-9ABD-4d9d-80C7-02AF85C822A8")]
public ref class MyTestClass: public IMyInterface
{
public:

   // Run regasm on this assembly to create .reg and .tlb files.
   // Reg file can be used to register this coclass in the registry.
   // Tlb file will be used to do interop.
   virtual void MyMethod(){}
};

int main()
{
   // Example addresses the following in System.Runtime.InterOpServices.GuidAttribute.
   // How to specify the attribute on interface/coclass.
   // Retrieve the GuidAttribute from an interface/coclass.
   // Value property on GuidAttribute class.
   // Example addresses the following in System.Guid.
   // Constructor Guid(string).
   // Constructor Guid(ByteArray).
   // Equals.
   // Operator ==.
   // CompareTo.
   Attribute^ IMyInterfaceAttribute = Attribute::GetCustomAttribute( IMyInterface::typeid, GuidAttribute::typeid );

   // The Value property of GuidAttribute returns a string. 
   System::Console::WriteLine( String::Concat(  "IMyInterface Attribute: ", (dynamic_cast<GuidAttribute^>(IMyInterfaceAttribute))->Value ) );

   // Using the string to create a guid.
   Guid myGuid1 = Guid(dynamic_cast<GuidAttribute^>(IMyInterfaceAttribute)->Value);

   // Using a byte array to create a guid.
   Guid myGuid2 = Guid(myGuid1.ToByteArray());

   // Equals is overridden and so value comparison is done though references are different.
   if ( myGuid1.Equals( myGuid2 ) )
      System::Console::WriteLine(  "myGuid1 equals myGuid2" );
   else
      System::Console::WriteLine(  "myGuid1 not equals myGuid2" );

   // Equality operator can also be used to determine if two guids have same value.
   if ( myGuid1 == myGuid2 )
      System::Console::WriteLine(  "myGuid1 == myGuid2" );
   else
      System::Console::WriteLine(  "myGuid1 != myGuid2" );

   // CompareTo returns 0 if the guids have same value.
   if ( myGuid1.CompareTo( myGuid2 ) == 0 )
      System::Console::WriteLine(  "myGuid1 compares to myGuid2" );
   else
      System::Console::WriteLine(  "myGuid1 does not compare to myGuid2" );

   //Output.
   //IMyInterface Attribute: F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4
   //myGuid1 equals myGuid2
   //myGuid1 == myGuid2
   //myGuid1 compares to myGuid2
}

import System.*;
import System.Runtime.InteropServices.*;

// Guid for the interface IMyInterface.
/** @attribute Guid("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4")
 */
interface IMyInterface
{
    void MyMethod();
} //IMyInterface

// Guid for the coclass MyTestClass.
/** @attribute Guid("936DA01F-9ABD-4d9d-80C7-02AF85C822A8")
 */
public class MyTestClass implements IMyInterface
{
    // Run regasm on this assembly to create .reg and .tlb files.
    // Reg file can be used to register this coclass in the registry.
    // Tlb file will be used to do interop.
    public void MyMethod()
    {
    } //MyMethod

    public static void main(String[] args)
    {
        // Example addresses the following in System.Runtime.
        // InterOpServices.GuidAttribute.
        // How to specify the attribute on interface/coclass.
        // Retrieve the GuidAttribute from an interface/coclass.
        // Value property on GuidAttribute class.
        // Example addresses the following in System.Guid.
        // Constructor Guid(string).
        // Constructor Guid(ByteArray).
        // Equals.
        // Operator ==.
        // CompareTo.
        Attribute iMyInterfaceAttribute = 
                  Attribute.GetCustomAttribute(IMyInterface.class.ToType(), 
                  GuidAttribute.class.ToType());

        // The Value property of GuidAttribute returns a string. 
        System.Console.WriteLine("IMyInterface Attribute: " 
            + ((GuidAttribute)(iMyInterfaceAttribute)).get_Value());

        // Using the string to create a guid.
        Guid myGuid1 = 
             new Guid(((GuidAttribute)(iMyInterfaceAttribute)).get_Value());
        // Using a byte array to create a guid.
        Guid myGuid2 = new Guid(myGuid1.ToByteArray());
        // Equals is overridden and so value comparison is done though 
        // references are different.
        if (myGuid1.Equals(myGuid2)) {
            System.Console.WriteLine("myGuid1 equals myGuid2");
        }
        else {
            System.Console.WriteLine("myGuid1 not equals myGuid2");
        }
        // Equality operator can also be used to determine if two 
        // guids have same value.
        if (myGuid1 == myGuid2) {
            System.Console.WriteLine("myGuid1 == myGuid2");
        }
        else {
            System.Console.WriteLine("myGuid1 != myGuid2");
        }
        // CompareTo returns 0 if the guids have same value.
        if (myGuid1.CompareTo(myGuid2) == 0) {
            System.Console.WriteLine("myGuid1 compares to myGuid2");
        }
        else {
            System.Console.WriteLine("myGuid1 does not compare to myGuid2");
        }
        System.Console.ReadLine();
    } //main 
} //MyTestClass 

//Output.
//IMyInterface Attribute: F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4
//myGuid1 equals myGuid2
//myGuid1 == myGuid2
//myGuid1 compares to myGuid2

import System;
import System.Runtime.InteropServices;

// Guid for the interface IMyInterface.
Guid("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4") interface IMyInterface
{
    function MyMethod();
}

// Guid for the coclass MyTestClass.
public Guid("936DA01F-9ABD-4d9d-80C7-02AF85C822A8") class MyTestClass implements IMyInterface
{
    // Run regasm on this assembly to create .reg and .tlb files.
    // Reg file can be used to register this coclass in the registry.
    // Tlb file will be used to do interop.

    public function MyMethod() {}

    public static function Main()
    {
        // Example addresses the following in System.Runtime.InterOpServices.GuidAttribute.
        // How to specify the attribute on interface/coclass.
        // Retrieve the GuidAttribute from an interface/coclass.
        // Value property on GuidAttribute class.

        // Example addresses the following in System.Guid.
        // Constructor Guid(string).
        // Constructor Guid(ByteArray).
        // Equals.
        // Operator ==.
        // CompareTo.

        var IMyInterfaceAttribute : Attribute = Attribute.GetCustomAttribute(Type.GetType("IMyInterface"), GuidAttribute);
        
        // The Value property of GuidAttribute returns a string. 
        System.Console.WriteLine( "IMyInterface Attribute: " + (GuidAttribute(IMyInterfaceAttribute)).Value );    

        // Using the string to create a guid.
        var myGuid1 : Guid = new Guid( (GuidAttribute(IMyInterfaceAttribute)).Value );
        // Using a byte array to create a guid.
        var myGuid2 : Guid = new Guid ( myGuid1.ToByteArray() );

        // Equals is overridden and so value comparison is done though references are different.
        if ( myGuid1.Equals( myGuid2 ) )
            System.Console.WriteLine( "myGuid1 equals myGuid2" );
        else
            System.Console.WriteLine( "myGuid1 not equals myGuid2" );

        // Equality operator can also be used to determine if two guids have same value.
        if ( myGuid1 == myGuid2 )
            System.Console.WriteLine( "myGuid1 == myGuid2" );
        else
            System.Console.WriteLine( "myGuid1 != myGuid2" );
    
        // CompareTo returns 0 if the guids have same value.
        if ( myGuid1.CompareTo( myGuid2 ) == 0 )
            System.Console.WriteLine( "myGuid1 compares to myGuid2" );
        else
            System.Console.WriteLine( "myGuid1 does not compare to myGuid2" );

        System.Console.ReadLine();

        //Output.
        //IMyInterface Attribute: F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4
        //myGuid1 equals myGuid2
        //myGuid1 == myGuid2
        //myGuid1 compares to myGuid2
    }
}

MyTestClass.Main();