Add support for paramref elements in the XmlDocumentationProvider (#6855)

Author: glen-84

src/HotChocolate/Core/src/Types/Types/Descriptors/Conventions/XmlDocumentationProvider.cs

@@ -25,6 +25,8 @@ public class XmlDocumentationProvider : IDocumentationProvider
     private const string _cref = "cref";
     private const string _href = "href";
     private const string _code = "code";
+    private const string _paramref = "paramref";
+    private const string _name = "name";
 
     private readonly IXmlDocumentationFileResolver _fileResolver;
     private readonly ObjectPool<StringBuilder> _stringBuilderPool;
@@ -164,6 +166,17 @@ private static void AppendText(
                 continue;
             }
 
+            if (currentElement.Name == _paramref)
+            {
+                var nameAttribute = currentElement.Attribute(_name);
+
+                if (nameAttribute != null)
+                {
+                    description.Append(nameAttribute.Value);
+                    continue;
+                }
+            }
+
             if (currentElement.Name != _see)
             {
                 description.Append(currentElement.Value);

src/HotChocolate/Core/test/Types.Tests.Documentation/WithParamrefTagInXmlDoc.cs

@@ -0,0 +1,10 @@
+namespace HotChocolate.Types.Descriptors
+{
+    public class WithParamrefTagInXmlDoc
+    {
+        /// <summary>
+        /// This is a parameter reference to <paramref name="id"/>.
+        /// </summary>
+        public int Foo(int id) => id;
+    }
+}

src/HotChocolate/Core/test/Types.Tests/Types/Descriptors/Conventions/XmlDocumentationProviderTests.cs

@@ -62,6 +62,25 @@ public void When_description_has_see_tag_then_it_is_converted()
             description);
     }
 
+    [Fact]
+    public void When_description_has_paramref_tag_then_it_is_converted()
+    {
+        // arrange
+        var documentationProvider = new XmlDocumentationProvider(
+            new XmlDocumentationFileResolver(),
+            new NoOpStringBuilderPool());
+
+        // act
+        var description = documentationProvider.GetDescription(
+            typeof(WithParamrefTagInXmlDoc)
+                .GetMethod(nameof(WithParamrefTagInXmlDoc.Foo))!);
+
+        // assert
+        Assert.Equal(
+            "This is a parameter reference to id.",
+            description);
+    }
+
     [Fact]
     public void When_description_has_generic_tags_then_it_is_converted()
     {