Nullable check

root.props

@@ -6,7 +6,7 @@
 		<Description>A GraphQL Client for .NET Standard</Description>
 		<GenerateAssemblyInfo>True</GenerateAssemblyInfo>
 		<GenerateDocumentationFile>True</GenerateDocumentationFile>
-		<LangVersion>latest</LangVersion>
+		<LangVersion>8.0</LangVersion>
 		<NeutralLanguage>en-US</NeutralLanguage>
 		<NoWarn>CS0618;CS1591;CS1701</NoWarn>
 		<PackageIconUrl>https://raw.githubusercontent.com/graphql-dotnet/graphql-client/master/assets/logo.64x64.png</PackageIconUrl>

src/GraphQL.Client/GraphQL.Client.csproj

@@ -1,11 +1,11 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<Import Project="../src.props" />
 
 	<PropertyGroup>
 		<Description>A GraphQL Client</Description>
-		<TargetFrameworks>netstandard1.3;netstandard2.0</TargetFrameworks>
+		<TargetFramework>netstandard2.0</TargetFramework>
 	</PropertyGroup>
 
 	<ItemGroup>

src/GraphQL.Client/Http/GraphQLHttpClient.cs

@@ -101,20 +101,20 @@ internal GraphQLHttpClient(GraphQLHttpClientOptions options, HttpClient httpClie
 		}
 
 		public Task<GraphQLResponse> SendQueryAsync(string query, CancellationToken cancellationToken = default) =>
-			this.SendQueryAsync(new GraphQLRequest { Query = query }, cancellationToken);
+			this.SendQueryAsync(new GraphQLRequest(query), cancellationToken);
 
 		public Task<GraphQLResponse> SendQueryAsync(GraphQLRequest request, CancellationToken cancellationToken = default) =>
 			this.graphQLHttpHandler.PostAsync(request, cancellationToken);
 
 		public Task<GraphQLResponse> SendMutationAsync(string query, CancellationToken cancellationToken = default) =>
-			this.SendMutationAsync(new GraphQLRequest { Query = query }, cancellationToken);
+			this.SendMutationAsync(new GraphQLRequest(query), cancellationToken);
 
 		public Task<GraphQLResponse> SendMutationAsync(GraphQLRequest request, CancellationToken cancellationToken = default) =>
 			this.graphQLHttpHandler.PostAsync(request, cancellationToken);
 
 		[Obsolete("EXPERIMENTAL API")]
 		public Task<IGraphQLSubscriptionResult> SendSubscribeAsync(string query, CancellationToken cancellationToken = default) =>
-			this.SendSubscribeAsync(new GraphQLRequest { Query = query }, cancellationToken);
+			this.SendSubscribeAsync(new GraphQLRequest(query), cancellationToken);
 
 		[Obsolete("EXPERIMENTAL API")]
 		public Task<IGraphQLSubscriptionResult> SendSubscribeAsync(GraphQLRequest request, CancellationToken cancellationToken = default) {

src/GraphQL.Client/Obsolete.GraphQLClient.Extensions.cs

@@ -99,8 +99,8 @@ fragment TypeRef on __Type {
 					}
 				}";
 
-		private static readonly GraphQLRequest IntrospectionGraphQLRequest = new GraphQLRequest {
-			Query = IntrospectionQuery.Replace("\t", "").Replace("\n", "").Replace("\r", ""),
+		private static readonly GraphQLRequest IntrospectionGraphQLRequest = new GraphQLRequest(
+			IntrospectionQuery.Replace("\t", "").Replace("\n", "").Replace("\r", "")){ 
 			Variables = null
 		};
 

src/GraphQL.Client/Obsolete.GraphQLClient.cs

@@ -53,7 +53,7 @@ public GraphQLClient(GraphQLClientOptions options) : base(options) { }
 		/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
 		/// <returns>The Response</returns>
 		public Task<GraphQLResponse> GetQueryAsync(string query, CancellationToken cancellationToken = default) =>
-			this.GetAsync(new GraphQLRequest { Query = query }, cancellationToken);
+			this.GetAsync(new GraphQLRequest(query), cancellationToken);
 
 		/// <summary>
 		/// Send a <see cref="GraphQLRequest"/> via GET
@@ -71,7 +71,7 @@ public Task<GraphQLResponse> GetAsync(GraphQLRequest request, CancellationToken
 		/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
 		/// <returns>The Response</returns>
 		public Task<GraphQLResponse> PostQueryAsync(string query, CancellationToken cancellationToken = default) =>
-			this.PostAsync(new GraphQLRequest { Query = query }, cancellationToken);
+			this.PostAsync(new GraphQLRequest(query), cancellationToken);
 
 		/// <summary>
 		/// Send a <see cref="GraphQLRequest"/> via POST

src/GraphQL.Common/GraphQL.Common.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<Import Project="../src.props" />
@@ -8,7 +8,7 @@
 	</PropertyGroup>
 
 	<PropertyGroup>
-		<TargetFrameworks>netstandard1.0;netstandard2.0</TargetFrameworks>
+		<TargetFramework>netstandard2.0</TargetFramework>
 	</PropertyGroup>
 
 	<ItemGroup>

src/GraphQL.Common/Request/GraphQLRequest.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using System.Collections.Generic;
 
@@ -7,7 +8,7 @@ namespace GraphQL.Common.Request {
 	/// Represents a Query that can be fetched to a GraphQL Server.
 	/// For more information <see href="http://graphql.org/learn/serving-over-http/#post-request"/>
 	/// </summary>
-	public class GraphQLRequest : IEquatable<GraphQLRequest> {
+	public class GraphQLRequest : IEquatable<GraphQLRequest?> {
 
 		/// <summary>
 		/// The Query
@@ -17,50 +18,40 @@ public class GraphQLRequest : IEquatable<GraphQLRequest> {
 		/// <summary>
 		/// If the provided <see cref="Query"/> contains multiple named operations, this specifies which operation should be executed.
 		/// </summary>
-		public string OperationName { get; set; }
+		public string? OperationName { get; set; }
 
 		/// <summary>
 		/// The Variables
 		/// </summary>
-		public dynamic Variables { get; set; }
+		public dynamic? Variables { get; set; }
+
+		/// <summary>
+		/// Initialize a new GraphQLRequest
+		/// </summary>
+		/// <param name="query">The Query</param>
+		public GraphQLRequest(string query){
+			this.Query = query;
+		}
 
 		/// <inheritdoc />
-		public override bool Equals(object obj) => this.Equals(obj as GraphQLRequest);
+		public override bool Equals(object? obj) => this.Equals(obj as GraphQLRequest);
 
 		/// <inheritdoc />
-		public bool Equals(GraphQLRequest other) {
+		public bool Equals(GraphQLRequest? other) {
 			if (other == null) {
 				return false;
 			}
-			if (ReferenceEquals(this, other)) {
-				return true;
-			}
-			if (!Equals(this.Query, other.Query)) {
-				return false;
-			}
-			if (!Equals(this.OperationName, other.OperationName)) {
-				return false;
-			}
-			if (!Equals(this.Variables, other.Variables)) {
-				return false;
-			}
-			return true;
+			return EqualityComparer<GraphQLRequest>.Default.Equals(this, other);
 		}
 
 		/// <inheritdoc />
-		public override int GetHashCode() {
-			var hashCode = -689803966;
-			hashCode = hashCode * -1521134295 + EqualityComparer<string>.Default.GetHashCode(this.Query);
-			hashCode = hashCode * -1521134295 + EqualityComparer<string>.Default.GetHashCode(this.OperationName);
-			hashCode = hashCode * -1521134295 + EqualityComparer<dynamic>.Default.GetHashCode(this.Variables);
-			return hashCode;
-		}
+		public override int GetHashCode() => EqualityComparer<GraphQLRequest>.Default.GetHashCode(this);
 
 		/// <inheritdoc />
-		public static bool operator ==(GraphQLRequest request1, GraphQLRequest request2) => EqualityComparer<GraphQLRequest>.Default.Equals(request1, request2);
+		public static bool operator ==(GraphQLRequest? request1, GraphQLRequest? request2) => EqualityComparer<GraphQLRequest?>.Default.Equals(request1, request2);
 
 		/// <inheritdoc />
-		public static bool operator !=(GraphQLRequest request1, GraphQLRequest request2) => !(request1 == request2);
+		public static bool operator !=(GraphQLRequest? request1, GraphQLRequest? request2) => !(request1 == request2);
 
 	}
 

tests/GraphQL.Client.Tests/GraphQLClientGetTests.cs

@@ -8,14 +8,12 @@ public class GraphQLClientGetTests : BaseGraphQLClientTest {
 
 		[Fact]
 		public async void QueryGetAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				{
 					person(personID: ""1"") {
 						name
 					}
-				}"
-			};
+				}");
 			var response = await this.GraphQLClient.GetAsync(graphQLRequest).ConfigureAwait(false);
 
 			Assert.Equal("Luke Skywalker", response.Data.person.name.Value);
@@ -24,8 +22,7 @@ public async void QueryGetAsyncFact() {
 
 		[Fact]
 		public async void OperationNameGetAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				query Person{
 					person(personID: ""1"") {
 						name
@@ -36,7 +33,7 @@ query Planet {
 					planet(planetID: ""1"") {
 						name
 					}
-				}",
+				}") {
 				OperationName = "Person"
 			};
 			var response = await this.GraphQLClient.GetAsync(graphQLRequest).ConfigureAwait(false);
@@ -47,13 +44,12 @@ query Planet {
 
 		[Fact]
 		public async void VariablesGetAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest (@"
 				query Person($personId: ID!){
 					person(personID: $personId) {
 						name
 					}
-				}",
+				}") {
 				Variables = new {
 					personId = "1"
 				}
@@ -66,8 +62,7 @@ query Person($personId: ID!){
 
 		[Fact]
 		public async void OperationNameVariableGetAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				query Person($personId: ID!){
 					person(personID: $personId) {
 						name
@@ -78,7 +73,7 @@ query Planet {
 					planet(planetID: ""1"") {
 						name
 					}
-				}",
+				}"){
 				OperationName = "Person",
 				Variables = new {
 					personId = "1"

tests/GraphQL.Client.Tests/GraphQLClientPostTests.cs

@@ -9,32 +9,28 @@ public class GraphQLClientPostTests : BaseGraphQLClientTest {
 
 		[Fact]
 		public async void QueryPostAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				{
 					person(personID: ""1"") {
 						name
 					}
 				}"
-			};
+			);
 			var response = await this.GraphQLClient.PostAsync(graphQLRequest).ConfigureAwait(false);
 
 			Assert.Equal("Luke Skywalker", response.Data.person.name.Value);
 			Assert.Equal("Luke Skywalker", response.GetDataFieldAs<Person>("person").Name);
 		}
 
 		[Fact]
-		public async void QueryPostAsyncWithoutUtf8EncodingFact()
-		{
-			var graphQLRequest = new GraphQLRequest
-			{
-				Query = @"
+		public async void QueryPostAsyncWithoutUtf8EncodingFact(){
+			var graphQLRequest = new GraphQLRequest(@"
 				{
 					person(personID: ""1"") {
 						name
 					}
 				}"
-			};
+			);
 			this.GraphQLClient.Options.MediaType = MediaTypeHeaderValue.Parse("application/json");
 			var response = await this.GraphQLClient.PostAsync(graphQLRequest).ConfigureAwait(false);
 
@@ -44,8 +40,7 @@ public async void QueryPostAsyncWithoutUtf8EncodingFact()
 
 		[Fact]
 		public async void OperationNamePostAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				query Person{
 					person(personID: ""1"") {
 						name
@@ -56,7 +51,7 @@ query Planet {
 					planet(planetID: ""1"") {
 						name
 					}
-				}",
+				}") { 
 				OperationName = "Person"
 			};
 			var response = await this.GraphQLClient.PostAsync(graphQLRequest).ConfigureAwait(false);
@@ -67,13 +62,12 @@ query Planet {
 
 		[Fact]
 		public async void VariablesPostAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				query Person($personId: ID!){
 					person(personID: $personId) {
 						name
 					}
-				}",
+				}") { 
 				Variables = new {
 					personId = "1"
 				}
@@ -86,8 +80,7 @@ query Person($personId: ID!){
 
 		[Fact]
 		public async void OperationNameVariablePostAsyncFact() {
-			var graphQLRequest = new GraphQLRequest {
-				Query = @"
+			var graphQLRequest = new GraphQLRequest(@"
 				query Person($personId: ID!){
 					person(personID: $personId) {
 						name
@@ -98,7 +91,7 @@ query Planet {
 					planet(planetID: ""1"") {
 						name
 					}
-				}",
+				}") { 
 				OperationName = "Person",
 				Variables = new {
 					personId = "1"