以下是我发现和使用的内容，也许它会帮助您：

function custom_posttype_dropdown($name, $selected)
{       
    $out = "";
    $posts = get_posts(
        array(
            \'post_type\'  => \'bctap_templates\',
            \'numberposts\' => -1
        )
    );
    if($posts )
    {

        $out = \'<select name="\'.$name.\'" ><option>Select a Template</option>\';
        foreach( $posts as $p )
        {
            if ($p==$selected)
            {
                $selected = "selected = \'selected\'";
            }
            else
            {
                $selected = "";
            }
            $out .= \'<option value="\' . $p->ID . \'" \'.$selected.\'>\' .$p->post_title  . \'</option>\';
        }
        $out .= \'</select>\';
    } 
    else
    {
        $out = \'<select name="\'.$name.\'" value="x" ><option>Select a Option</option>\';
        foreach( $posts as $p )
        {               
            $out .= \'<option value="x" \'.$selected.\'>None Created Yet.</option>\';
        }
        $out .= \'</select>\';
    }
    return $out;
}

//to call
echo custom_posttype_dropdown($name, $selected);