Refactor GraphQLClient to use default options for JSON serialization and update documentation in GraphQLRequestOptions

Author: clement911

GraphQLSharp/Client/GraphQLClient.cs

@@ -62,7 +62,7 @@ private async Task<GraphQLResponse<T>> ExecuteCoreAsync<T>(GraphQLRequest reques
             GraphQLResponse<T> res;
             try
             {
-                res = await httpResponseMsg.Content.ReadFromJsonAsync<GraphQLResponse<T>>(Serializer.Options, cancellationToken);
+                res = await httpResponseMsg.Content.ReadFromJsonAsync<GraphQLResponse<T>>(_defaultOptions.JsonSerializerOptions ?? options.JsonSerializerOptions ?? Serializer.Options, cancellationToken);
                 if (res == null)
                     throw new GraphQLException(request, httpResponse, $"Failed to deserialize null GraphQL response. Request: {request}");
             }
@@ -93,7 +93,7 @@ private HttpRequestMessage CreateHttpRequest(GraphQLRequest request, GraphQLRequ
         {
             Method = HttpMethod.Post,
             RequestUri = uri,
-            Content = JsonContent.Create(request, options: Serializer.Options),
+            Content = JsonContent.Create(request, options: _defaultOptions.JsonSerializerOptions ?? options.JsonSerializerOptions ?? Serializer.Options),
         };
 
         requestMessage.Headers.UserAgent.Add(_defaultUserAgent);

GraphQLSharp/Client/GraphQLRequestOptions.cs

@@ -1,4 +1,5 @@
 using System.Net.Http.Headers;
+using System.Text.Json;
 
 namespace GraphQLSharp;
 
@@ -18,20 +19,25 @@ public class GraphQLRequestOptions
     public Uri Uri { get; set; }
 
     /// <summary>
-    /// HttpClient to be used/
+    /// An (optional) custom HttpClient to be used for sending requests.
     /// If null, a default shared HttpClient is used
     /// If set, you control the lifetime of the HttpClient.
     /// </summary>
     public HttpClient HttpClient { get; set; }
 
     /// <summary>
-    /// A configuration callback to modify the HttpRequestHeaders before sending the request.
+    /// An (optional) configuration callback to modify the HttpRequestHeaders before sending the request.
     /// This can be used to set custom headers, authentication tokens, etc.
     /// </summary>
     public Action<HttpRequestHeaders> ConfigureHttpRequestHeaders { get; set; }
 
     /// <summary>
-    /// Interceptor to be used for this request.
+    /// An (optional) JSON serializer options to be used for serializing and deserializing GraphQL requests and responses.
+    /// </summary>
+    public JsonSerializerOptions JsonSerializerOptions { get; set; }
+
+    /// <summary>
+    /// An (optional) Interceptor to be used for this request.
     /// </summary>
     public IInterceptor Interceptor { get; set; }
 }