.NET (Core and Framework)

A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in System.Windows.Forms.dll
(... and 9 more just like above)

using System;
using System.Diagnostics;
using System.Windows.Forms;
 
 
public class FooNode
{
    private Guid m_Guid;
    private string m_Name = String.Empty;
 
    public FooNode( )
    {
        m_Guid = Guid.NewGuid();
        m_Name = "Foo";
    }
 
    public Guid Guid
    {
        get { return m_Guid; }
        set { m_Guid = value; }
    }
 
    public string Name
    {
        get { return m_Name; }
        set { m_Name = value; }
    }
}
 
 
public class FooTest
{
    // Entry point for test of using system clipboard.
    public static void Test( )
    {
        FooNode fooNode = new FooNode();
 
        // Add a FooNode to the system clipboard.    
        DataObject dob = new DataObject( fooNode );
        dob.SetData( typeof( Guid ), fooNode.Guid );
        dob.SetData( DataFormats.StringFormat, fooNode.Guid.ToString() );
        Clipboard.SetDataObject( dob );
 
        // Retrieve the FooNode from the system clipboard.
        // *** Notice that the returned object is null. ***
        object raw = Clipboard.GetDataObject().GetData( typeof( FooNode ) );
 
        // This spam function demonstrates what can and cannot be retrieved from the clipboard.
        Spam( Clipboard.GetDataObject(), new Type[] { typeof( FooNode ), typeof( Guid ) } );
    }
 
 
    public static void Spam( IDataObject dob, Type[] types )
    {
        Debug.WriteLine( dob );
        Debug.Indent();
 
        Debug.WriteLine( "Data formats:" );
        Debug.Indent();
        string[] formatNames = dob.GetFormats( true );
        foreach ( string name in formatNames )
        {
            Debug.WriteLine( name );
        }
        Debug.Unindent();
 
        // Test if I can access the data by format name.
        foreach ( string name in formatNames )
        {
            if ( dob.GetDataPresent( name ) )
            {
                Debug.WriteLine( String.Format( "Present as format=\"{0}\"", name ) );
                Debug.Indent();
                object raw = dob.GetData( name );
                Debug.WriteLine( String.Format( "raw={0}", raw != null ? raw : "null" ) );
                Debug.Unindent();
            }
        }
 
        // Test if I can access the data by type.
        if ( types != null )
        {
            foreach ( Type type in types )
            {
                if ( dob.GetDataPresent( type ) )
                {
                    Debug.WriteLine( String.Format( "Present as type={0}", type ) );
                    Debug.Indent();
                    object raw = dob.GetData( type );
                    Debug.WriteLine( String.Format( "raw={0}", raw != null ? raw : "null" ) );
                    Debug.Unindent();
                }
            }
        }
 
        Debug.Unindent();
    }
}