diff --git a/composer.json b/composer.json
index b55c14f..7b72230 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,8 @@
     "require": {
         "php": ">= 8.1",
         "jms/metadata": "^2.6.1",
-        "symfony/property-access": "^3.4|^4.0|^5.0|^6.0|^7.0"
+        "symfony/property-access": "^3.4|^4.0|^5.0|^6.0|^7.0",
+        "symfony/expression-language": "^3.4|^4.0|^5.0|^6.0|^7.0"
     },
 
     "require-dev": {
diff --git a/src/JMS/ObjectRouting/Attribute/ObjectRoute.php b/src/JMS/ObjectRouting/Attribute/ObjectRoute.php
index 01458a4..89ad9ce 100644
--- a/src/JMS/ObjectRouting/Attribute/ObjectRoute.php
+++ b/src/JMS/ObjectRouting/Attribute/ObjectRoute.php
@@ -30,10 +30,14 @@ final class ObjectRoute
     /** @var array */
     public $params = array();
 
-    public function __construct(string $type, string $name, array $params = [])
+    /** @var array */
+    public $paramExpressions = array();
+
+    public function __construct(string $type, string $name, array $params = [], array $paramExpressions = [])
     {
         $this->type = $type;
         $this->name = $name;
         $this->params = $params;
+        $this->paramExpressions = $paramExpressions;
     }
 }
diff --git a/src/JMS/ObjectRouting/Metadata/ClassMetadata.php b/src/JMS/ObjectRouting/Metadata/ClassMetadata.php
index dc7856e..0f733b0 100644
--- a/src/JMS/ObjectRouting/Metadata/ClassMetadata.php
+++ b/src/JMS/ObjectRouting/Metadata/ClassMetadata.php
@@ -25,11 +25,12 @@ class ClassMetadata extends MergeableClassMetadata
 {
     public $routes = array();
 
-    public function addRoute($type, $name, array $params = array())
+    public function addRoute($type, $name, array $params = array(), array $paramExpressions = array())
     {
         $this->routes[$type] = array(
             'name' => $name,
             'params' => $params,
+            'paramExpressions' => $paramExpressions,
         );
     }
 
diff --git a/src/JMS/ObjectRouting/Metadata/Driver/AttributeDriver.php b/src/JMS/ObjectRouting/Metadata/Driver/AttributeDriver.php
index 3a74288..47013eb 100644
--- a/src/JMS/ObjectRouting/Metadata/Driver/AttributeDriver.php
+++ b/src/JMS/ObjectRouting/Metadata/Driver/AttributeDriver.php
@@ -31,7 +31,7 @@ public function loadMetadataForClass(\ReflectionClass $class): ?ClassMetadata
         $hasMetadata = false;
         foreach ($this->fetchAttributes($class) as $attribute) {
             $hasMetadata = true;
-            $metadata->addRoute($attribute->type, $attribute->name, $attribute->params);
+            $metadata->addRoute($attribute->type, $attribute->name, $attribute->params, $attribute->paramExpressions);
         }
 
         return $hasMetadata ? $metadata : null;
diff --git a/src/JMS/ObjectRouting/Metadata/Driver/XmlDriver.php b/src/JMS/ObjectRouting/Metadata/Driver/XmlDriver.php
index 5c9435e..b3b2f04 100644
--- a/src/JMS/ObjectRouting/Metadata/Driver/XmlDriver.php
+++ b/src/JMS/ObjectRouting/Metadata/Driver/XmlDriver.php
@@ -76,7 +76,12 @@ protected function loadMetadataFromFile(\ReflectionClass $class, string $file):
                 $params[(string)$p->attributes()] = (string)$p;
             }
 
-            $metadata->addRoute($type, $name, $params);
+            $paramExpressions = array();
+            foreach ($r->xpath('./paramExpression') as $p) {
+                $paramExpressions[(string)$p->attributes()] = (string)$p;
+            }
+
+            $metadata->addRoute($type, $name, $params, $paramExpressions);
         }
 
         return $metadata;
diff --git a/src/JMS/ObjectRouting/Metadata/Driver/YamlDriver.php b/src/JMS/ObjectRouting/Metadata/Driver/YamlDriver.php
index 57ea4dc..254079c 100644
--- a/src/JMS/ObjectRouting/Metadata/Driver/YamlDriver.php
+++ b/src/JMS/ObjectRouting/Metadata/Driver/YamlDriver.php
@@ -58,7 +58,12 @@ protected function loadMetadataFromFile(\ReflectionClass $class, string $file):
             if (!array_key_exists('name', $value)) {
                 throw new RuntimeException('Could not find key "type" inside yaml element.');
             }
-            $metadata->addRoute($type, $value['name'], array_key_exists('params', $value) ? $value['params'] : array());
+            $metadata->addRoute(
+                $type,
+                $value['name'],
+                array_key_exists('params', $value) ? $value['params'] : array(),
+                array_key_exists('paramExpressions', $value) ? $value['paramExpressions'] : array()
+            );
         }
 
         return $metadata;
diff --git a/src/JMS/ObjectRouting/ObjectRouter.php b/src/JMS/ObjectRouting/ObjectRouter.php
index 19bddf7..89403a9 100644
--- a/src/JMS/ObjectRouting/ObjectRouter.php
+++ b/src/JMS/ObjectRouting/ObjectRouter.php
@@ -23,6 +23,7 @@
 use Metadata\Driver\DriverChain;
 use Metadata\MetadataFactory;
 use Metadata\MetadataFactoryInterface;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 use Symfony\Component\PropertyAccess\PropertyAccessor;
 
 class ObjectRouter
@@ -30,6 +31,7 @@ class ObjectRouter
     private $router;
     private $metadataFactory;
     private $accessor;
+    private $expressionLanguage;
 
     public static function create(RouterInterface $router)
     {
@@ -46,6 +48,7 @@ public function __construct(RouterInterface $router, MetadataFactoryInterface $m
         $this->router = $router;
         $this->metadataFactory = $metadataFactory;
         $this->accessor = new PropertyAccessor();
+        $this->expressionLanguage = new ExpressionLanguage();
     }
 
     /**
@@ -86,6 +89,18 @@ public function generate($type, $object, $absolute = false, array $extraParams =
             $params[$k] = $this->accessor->getValue($object, $path);
         }
 
+        foreach ($route['paramExpressions'] as $k => $expression) {
+            $evaluated = $this->expressionLanguage->evaluate($expression, ['this' => $object]);
+            if ($k[0] === '?') {
+                if ($evaluated === null) {
+                    continue;
+                }
+                $params[substr($k, 1)] = $evaluated;
+            } else {
+                $params[$k] = $evaluated;
+            }
+        }
+
         return $this->router->generate($route['name'], $params, $absolute);
     }
 
diff --git a/tests/JMS/Tests/ObjectRouting/Metadata/ClassMetadataTest.php b/tests/JMS/Tests/ObjectRouting/Metadata/ClassMetadataTest.php
index b2b17f3..3dd2299 100644
--- a/tests/JMS/Tests/ObjectRouting/Metadata/ClassMetadataTest.php
+++ b/tests/JMS/Tests/ObjectRouting/Metadata/ClassMetadataTest.php
@@ -18,6 +18,6 @@ public function testMerge()
         $base->merge($merged);
 
         $this->assertEquals(self::class, $base->name);
-        $this->assertEquals(['test' => ['name' => 'merged-route', 'params' => []]], $base->routes);
+        $this->assertEquals(['test' => ['name' => 'merged-route', 'params' => [], 'paramExpressions' => []]], $base->routes);
     }
 }
diff --git a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/AttributeDriverTest.php b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/AttributeDriverTest.php
index 7755b0a..e26ac40 100644
--- a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/AttributeDriverTest.php
+++ b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/AttributeDriverTest.php
@@ -16,8 +16,8 @@ public function testLoad()
         $this->assertCount(2, $metadata->routes);
 
         $routes = [
-            'view' => ['name' => 'blog_post_view', 'params' => ['slug' => 'slug']],
-            'edit' => ['name' => 'blog_post_edit', 'params' => ['slug' => 'slug']],
+            'view' => ['name' => 'blog_post_view', 'params' => ['slug' => 'slug'], 'paramExpressions' => ['?year' => 'this.isArchived ? this.year : null']],
+            'edit' => ['name' => 'blog_post_edit', 'params' => ['slug' => 'slug'], 'paramExpressions' => []],
         ];
         $this->assertEquals($routes, $metadata->routes);
     }
diff --git a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/Fixture/BlogPostWithAttributes.php b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/Fixture/BlogPostWithAttributes.php
index 90c61be..9848065 100644
--- a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/Fixture/BlogPostWithAttributes.php
+++ b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/Fixture/BlogPostWithAttributes.php
@@ -4,19 +4,33 @@
 
 use JMS\ObjectRouting\Attribute\ObjectRoute;
 
-#[ObjectRoute(type: "view", name: "blog_post_view", params: ['slug' => 'slug'])]
+#[ObjectRoute(type: "view", name: "blog_post_view", params: ['slug' => 'slug'], paramExpressions: ['?year' => 'this.isArchived ? this.year : null'])]
 #[ObjectRoute(type: "edit", name: "blog_post_edit", params: ['slug' => 'slug'])]
 class BlogPostWithAttributes
 {
     private $slug;
+    private $archived;
+    private $year;
 
-    public function __construct($slug)
+    public function __construct($slug, $archived, $year)
     {
         $this->slug = $slug;
+        $this->archived = $archived;
+        $this->year = $year;
     }
 
     public function getSlug()
     {
         return $this->slug;
     }
+
+    public function isArchived()
+    {
+        return $this->archived;
+    }
+
+    public function getYear()
+    {
+        return $this->year;
+    }
 }
diff --git a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/PhpDriverTest.php b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/PhpDriverTest.php
index f112ed6..f895072 100644
--- a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/PhpDriverTest.php
+++ b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/PhpDriverTest.php
@@ -16,10 +16,10 @@ public function testLoad()
         $metadata = $this->driver->loadMetadataForClass(new \ReflectionClass('JMS\Tests\ObjectRouting\Metadata\Driver\Fixture\BlogPost'));
         $this->assertCount(2, $metadata->routes);
 
-        $routes = array(
-            'view' => array('name' => 'blog_post_view', 'params' => array('slug' => 'slug')),
-            'edit' => array('name' => 'blog_post_edit', 'params' => array('slug' => 'slug')),
-        );
+        $routes = [
+            'view' => ['name' => 'blog_post_view', 'params' => ['slug' => 'slug'], 'paramExpressions' => ['?year' => 'this.isArchived ? this.year : null']],
+            'edit' => ['name' => 'blog_post_edit', 'params' => ['slug' => 'slug'], 'paramExpressions' => []],
+        ];
         $this->assertEquals($routes, $metadata->routes);
     }
 
diff --git a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/XmlDriverTest.php b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/XmlDriverTest.php
index 8892fa2..65a15f7 100644
--- a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/XmlDriverTest.php
+++ b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/XmlDriverTest.php
@@ -18,10 +18,10 @@ public function testLoad()
         $metadata = $this->driver->loadMetadataForClass(new \ReflectionClass('JMS\Tests\ObjectRouting\Metadata\Driver\Fixture\BlogPost'));
         $this->assertCount(2, $metadata->routes);
 
-        $routes = array(
-            'view' => array('name' => 'blog_post_view', 'params' => array('slug' => 'slug')),
-            'edit' => array('name' => 'blog_post_edit', 'params' => array('slug' => 'slug')),
-        );
+        $routes = [
+            'view' => ['name' => 'blog_post_view', 'params' => ['slug' => 'slug'], 'paramExpressions' => ['?year' => 'this.isArchived ? this.year : null']],
+            'edit' => ['name' => 'blog_post_edit', 'params' => ['slug' => 'slug'], 'paramExpressions' => []],
+        ];
         $this->assertEquals($routes, $metadata->routes);
     }
 
diff --git a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/YamlDriverTest.php b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/YamlDriverTest.php
index 3e65704..eade4b6 100644
--- a/tests/JMS/Tests/ObjectRouting/Metadata/Driver/YamlDriverTest.php
+++ b/tests/JMS/Tests/ObjectRouting/Metadata/Driver/YamlDriverTest.php
@@ -18,10 +18,10 @@ public function testLoad()
         $metadata = $this->driver->loadMetadataForClass(new \ReflectionClass('JMS\Tests\ObjectRouting\Metadata\Driver\Fixture\BlogPost'));
         $this->assertCount(2, $metadata->routes);
 
-        $routes = array(
-            'view' => array('name' => 'blog_post_view', 'params' => array('slug' => 'slug')),
-            'edit' => array('name' => 'blog_post_edit', 'params' => array('slug' => 'slug')),
-        );
+        $routes = [
+            'view' => ['name' => 'blog_post_view', 'params' => ['slug' => 'slug'], 'paramExpressions' => ['?year' => 'this.isArchived ? this.year : null']],
+            'edit' => ['name' => 'blog_post_edit', 'params' => ['slug' => 'slug'], 'paramExpressions' => []],
+        ];
         $this->assertEquals($routes, $metadata->routes);
     }
 
diff --git a/tests/JMS/Tests/ObjectRouting/ObjectRouterTest.php b/tests/JMS/Tests/ObjectRouting/ObjectRouterTest.php
index 2b35cb0..90d0ece 100644
--- a/tests/JMS/Tests/ObjectRouting/ObjectRouterTest.php
+++ b/tests/JMS/Tests/ObjectRouting/ObjectRouterTest.php
@@ -53,6 +53,47 @@ public function testGenerateWithParams()
         $this->assertEquals('/foobar', $this->router->generate('view', $object));
     }
 
+    public function testGenerateWithParamExpression()
+    {
+        $metadata = new ClassMetadata('stdClass');
+        $metadata->addRoute('view', 'view_name', [], ['foo' => 'this.bar']);
+
+        $object = new \stdClass;
+        $object->bar = 'baz';
+
+        $this->factory->expects($this->once())
+            ->method('getMetadataForClass')
+            ->will($this->returnValue($metadata));
+
+        $this->adapter->expects($this->once())
+            ->method('generate')
+            ->with('view_name', array('foo' => 'baz'), false)
+            ->will($this->returnValue('/foobar'));
+
+        $this->assertEquals('/foobar', $this->router->generate('view', $object));
+    }
+
+    public function testGenerateWithNullableParamExpression()
+    {
+        $metadata = new ClassMetadata('stdClass');
+        $metadata->addRoute('view', 'view_name', [], ['?foo' => 'this.bar', '?quux' => 'this.barbaz']);
+
+        $object = new \stdClass;
+        $object->bar = 'baz';
+        $object->barbaz = null;
+
+        $this->factory->expects($this->once())
+            ->method('getMetadataForClass')
+            ->will($this->returnValue($metadata));
+
+        $this->adapter->expects($this->once())
+            ->method('generate')
+            ->with('view_name', array('foo' => 'baz'), false)
+            ->will($this->returnValue('/foobar'));
+
+        $this->assertEquals('/foobar', $this->router->generate('view', $object));
+    }
+
     public function testGenerateNonExistentType()
     {
         $this->expectException(\RuntimeException::class);
diff --git a/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.php b/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.php
index 5604334..6d28507 100644
--- a/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.php
+++ b/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.php
@@ -2,7 +2,7 @@
 
 $metadata = new JMS\ObjectRouting\Metadata\ClassMetadata('JMS\Tests\ObjectRouting\Metadata\Driver\Fixture\BlogPost');
 
-$metadata->addRoute('view', 'blog_post_view', array('slug' => 'slug'));
-$metadata->addRoute('edit', 'blog_post_edit', array('slug' => 'slug'));
+$metadata->addRoute('view', 'blog_post_view', ['slug' => 'slug'], ['?year' => 'this.isArchived ? this.year : null']);
+$metadata->addRoute('edit', 'blog_post_edit', ['slug' => 'slug']);
 
-return $metadata;
\ No newline at end of file
+return $metadata;
diff --git a/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.xml b/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.xml
index 653e00e..4ae1855 100644
--- a/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.xml
+++ b/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.xml
@@ -3,9 +3,10 @@
     <class name="JMS\Tests\ObjectRouting\Metadata\Driver\Fixture\BlogPost">
         <route type="view" name="blog_post_view">
             <param name="slug">slug</param>
+            <paramExpression name="?year">this.isArchived ? this.year : null</paramExpression>
         </route>
         <route type="edit" name="blog_post_edit">
             <param name="slug">slug</param>
         </route>
     </class>
-</object-routing>
\ No newline at end of file
+</object-routing>
diff --git a/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.yml b/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.yml
index f6edd7a..ca1985f 100644
--- a/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.yml
+++ b/tests/JMS/Tests/ObjectRouting/Resources/config/JMS.Tests.ObjectRouting.Metadata.Driver.Fixture.BlogPost.yml
@@ -3,6 +3,8 @@ JMS\Tests\ObjectRouting\Metadata\Driver\Fixture\BlogPost:
         name: "blog_post_view"
         params:
             slug: "slug"
+        paramExpressions:
+            ?year: "this.isArchived ? this.year : null"
     edit:
         name: "blog_post_edit"
         params: