Introduced RegisterValueType<TValueType>() method to allow custom value type registration using generics

Author: HakamFostok

src/Marten/StoreOptions.Identity.cs

@@ -21,7 +21,8 @@ internal IDocumentStorage<TDoc, TId> ResolveCorrectedDocumentStorage<TDoc, TId>(
         var provider = Providers.StorageFor<TDoc>();
         var raw = provider.Select(tracking);
 
-        if (raw is IDocumentStorage<TDoc, TId> storage) return storage;
+        if (raw is IDocumentStorage<TDoc, TId> storage)
+            return storage;
 
         var valueTypeInfo = TryFindValueType(raw.IdType);
         if (valueTypeInfo == null)
@@ -76,8 +77,10 @@ internal IIdGeneration DetermineIdStrategy(Type documentType, MemberInfo idMembe
 
     private bool idMemberIsSettable(MemberInfo idMember)
     {
-        if (idMember is FieldInfo f) return f.IsPublic;
-        if (idMember is PropertyInfo p) return p.CanWrite && p.SetMethod != null;
+        if (idMember is FieldInfo f)
+            return f.IsPublic;
+        if (idMember is PropertyInfo p)
+            return p.CanWrite && p.SetMethod != null;
 
         return false;
     }
@@ -93,6 +96,19 @@ internal ValueTypeInfo FindOrCreateValueType(Type idType)
         return valueType ?? RegisterValueType(idType);
     }
 
+    /// <summary>
+    /// Register a custom value type with Marten. Doing this enables Marten
+    /// to use this type correctly within LINQ expressions. The "TValueType"
+    /// should wrap a single, primitive value with a single public get-able
+    /// property
+    /// </summary>
+    /// <param name="type"></param>
+    /// <returns></returns>
+    public ValueTypeInfo RegisterValueType<TValueType>() where TValueType : notnull
+    {
+        return RegisterValueType(typeof(TValueType));
+    }
+
     /// <summary>
     /// Register a custom value type with Marten. Doing this enables Marten
     /// to use this type correctly within LINQ expressions. The "value type"
@@ -122,7 +138,8 @@ public ValueTypeInfo RegisterValueType(Type type)
             valueProperty = type.GetProperties().SingleOrDefaultIfMany();
         }
 
-        if (valueProperty == null || !valueProperty.CanRead) throw new InvalidValueTypeException(type, "Must be only a single public, 'gettable' property");
+        if (valueProperty == null || !valueProperty.CanRead)
+            throw new InvalidValueTypeException(type, "Must be only a single public, 'gettable' property");
 
         var ctor = type.GetConstructors()
             .FirstOrDefault(x => x.GetParameters().Length == 1 && x.GetParameters()[0].ParameterType == valueProperty.PropertyType);