Avoid double lookups, use isNull instead of = null (#489)

Author: Thorium

src/FSharp.Data.GraphQL.Client.DesignTime/ProvidedTypesHelper.fs

@@ -497,15 +497,15 @@ module internal Provider =
         let rootWrapper = generateWrapper "Types"
         wrappersByPath.Add([], rootWrapper)
         let rec getWrapper (path : FieldStringPath) =
-            if wrappersByPath.ContainsKey path
-            then wrappersByPath.[path]
-            else
+            match wrappersByPath.TryGetValue path with
+            | true, wrappedPath -> wrappedPath
+            | false, _ ->
                 let wrapper = generateWrapper (path.Head.FirstCharUpper() + "Fields")
                 let upperWrapper =
                     let path = path.Tail
-                    if wrappersByPath.ContainsKey(path)
-                    then wrappersByPath.[path]
-                    else getWrapper path
+                    match wrappersByPath.TryGetValue path with
+                    | true, wpath -> wpath
+                    | false, _ -> getWrapper path
                 upperWrapper.AddMember(wrapper)
                 wrappersByPath.Add(path, wrapper)
                 wrapper
@@ -528,9 +528,9 @@ module internal Provider =
                 then TypeMapping.makeOption providedTypes.[path, tref.Name.Value]
                 else
                     let getIntrospectionFields typeName =
-                        if schemaTypes.ContainsKey(typeName)
-                        then schemaTypes.[typeName].Fields |> Option.defaultValue [||]
-                        else failwith $"""Could not find a schema type based on a type reference. The reference is to a "%s{typeName}" type, but that type was not found in the schema types."""
+                        match schemaTypes.TryGetValue typeName with
+                        | true, schematype -> schematype.Fields |> Option.defaultValue [||]
+                        | false, _ -> failwith $"""Could not find a schema type based on a type reference. The reference is to a "%s{typeName}" type, but that type was not found in the schema types."""
                     let getPropertyMetadata typeName (info : AstFieldInfo) : RecordPropertyMetadata =
                         let ifield =
                             match getIntrospectionFields typeName |> Array.tryFind(fun f -> f.Name = info.Name) with
@@ -564,9 +564,9 @@ module internal Provider =
                         ProvidedRecord.makeProvidedType(tdef, baseProperties, explicitOptionalParameters)
                     let createFragmentType (typeName, properties) =
                         let itype =
-                            if schemaTypes.ContainsKey(typeName)
-                            then schemaTypes.[typeName]
-                            else failwithf "Could not find schema type based on the query. Type \"%s\" does not exist on the schema definition." typeName
+                            match schemaTypes.TryGetValue typeName with
+                            | true, schematype -> schematype
+                            | false, _ -> failwithf "Could not find schema type based on the query. Type \"%s\" does not exist on the schema definition." typeName
                         let metadata : ProvidedTypeMetadata = { Name = itype.Name; Description = itype.Description }
                         let tdef = ProvidedRecord.preBuildProvidedType(metadata, Some (upcast baseType))
                         providedTypes.Add((path, typeName), tdef)
@@ -643,9 +643,9 @@ module internal Provider =
                 |> makeOption
             | _ -> failwith "Could not find a schema type based on a type reference. The reference has an invalid or unsupported combination of Name, Kind and OfType fields."
         and resolveProvidedType (itype : IntrospectionType) : ProvidedTypeDefinition =
-            if providedTypes.Value.ContainsKey(itype.Name)
-            then providedTypes.Value.[itype.Name]
-            else
+            match providedTypes.Value.TryGetValue itype.Name with
+            | true, ptval -> ptval
+            | false, _ ->
                 let metadata = { Name = itype.Name; Description = itype.Description }
                 match itype.Kind with
                 | TypeKind.OBJECT ->

src/FSharp.Data.GraphQL.Server.AspNetCore/GraphQLSubscriptionsManagement.fs

@@ -19,9 +19,11 @@ let executeOnUnsubscribeAndDispose (id : SubscriptionId) (subscription : Subscri
             unsubscriber.Dispose ()
 
 let removeSubscription (id : SubscriptionId) (subscriptions : SubscriptionsDict) =
-    if subscriptions.ContainsKey (id) then
-        subscriptions.[id] |> executeOnUnsubscribeAndDispose id
+    match subscriptions.TryGetValue id with
+    | true, sub ->
+        sub |> executeOnUnsubscribeAndDispose id
         subscriptions.Remove (id) |> ignore
+    | false, _ -> ()
 
 let removeAllSubscriptions (subscriptions : SubscriptionsDict) =
     subscriptions

src/FSharp.Data.GraphQL.Shared/Helpers/Reflection.fs

@@ -79,7 +79,7 @@ module internal ReflectionHelper =
         let some =
             let createSome = optionType.GetDeclaredMethod "Some"
             fun value ->
-                if value <> null
+                if not (isNull value)
                 then
                     let valueType = value.GetType().GetTypeInfo()
                     if valueType = optionType
@@ -91,7 +91,7 @@ module internal ReflectionHelper =
         let value =
             let x = optionType.GetDeclaredProperty "Value"
             fun input ->
-                if input <> null
+                if not (isNull input)
                 then
                     let valueType = input.GetType().GetTypeInfo()
                     if valueType = optionType
@@ -113,7 +113,7 @@ module internal ReflectionHelper =
         let some =
             let createSome = optionType.GetDeclaredMethod "Some"
             fun value ->
-                if value <> null
+                if not (isNull value)
                 then
                     let valueType = value.GetType().GetTypeInfo()
                     if valueType = optionType
@@ -125,7 +125,7 @@ module internal ReflectionHelper =
         let value =
             let x = optionType.GetDeclaredProperty "Value"
             fun input ->
-                if input <> null
+                if not (isNull input)
                 then
                     let valueType = input.GetType().GetTypeInfo()
                     if valueType = optionType

src/FSharp.Data.GraphQL.Shared/SchemaDefinitions.fs

@@ -169,7 +169,7 @@ module SchemaDefinitions =
 
     /// Check if provided obj value is an Option and extract its wrapped value as object if possible
     let private (|Option|_|) (x : obj) =
-        if x = null then None
+        if isNull x then None
         else
             let t = x.GetType().GetTypeInfo()
             if t.IsGenericType && t.GetGenericTypeDefinition() = typedefof<option<_>> then

src/FSharp.Data.GraphQL.Shared/TypeSystem.fs

@@ -515,9 +515,9 @@ and FieldExecuteMap (compiler : FieldExecuteCompiler) =
     /// <param name="fieldName">The field name of the object that has the field that needs to be executed.</param>
     member _.GetExecute (typeName : string, fieldName : string) =
         let key = getKey typeName fieldName
-        if map.ContainsKey (key) then
-            fst map.[key]
-        else
+        match map.TryGetValue key with
+        | true, mapv -> fst mapv
+        | false, _ ->
             Unchecked.defaultof<ExecuteField>
 
     /// <summary>