From be1500919d00e9205a45e787a0b4715e1ec17d35 Mon Sep 17 00:00:00 2001
From: "Mark.Dingley" <Mark.Dingley@quidvisrisk.com>
Date: Tue, 8 Sep 2026 09:50:27 +0100
Subject: [PATCH] Adds ToByteArrayAsync with cancellation support

---
 QuickChart/QuickChart.cs | 52 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/QuickChart/QuickChart.cs b/QuickChart/QuickChart.cs
index 01d16e6..bf95a45 100644
--- a/QuickChart/QuickChart.cs
+++ b/QuickChart/QuickChart.cs
@@ -3,6 +3,8 @@
 using System.Text;
 using System.Text.Json;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace QuickChart
 {
@@ -51,7 +53,7 @@ public Chart(string scheme = null, string host = null, int? port = null)
                     }
                     else
                     {
-                        if(scheme == "http")
+                        if (scheme == "http")
                         {
                             Port = 80;
                         }
@@ -178,6 +180,52 @@ public byte[] ToByteArray()
             return response.Content.ReadAsByteArrayAsync().Result;
         }
 
+        public async Task<byte[]> ToByteArrayAsync(CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (Config == null)
+            {
+                throw new NullReferenceException("You must set Config on the QuickChart object before generating a URL");
+            }
+
+            var options = new JsonSerializerOptions()
+            {
+                IgnoreNullValues = true,
+            };
+
+            var json = JsonSerializer.Serialize(new
+            {
+                width = Width,
+                height = Height,
+                backgroundColor = BackgroundColor,
+                devicePixelRatio = DevicePixelRatio,
+                format = Format,
+                chart = Config,
+            }, options);
+
+            var url = $"{Scheme}://{Host}:{Port}/chart";
+
+            using (var content = new StringContent(json, Encoding.UTF8, "application/json"))
+            {
+                var response = await Client.PostAsync(url, content, cancellationToken).ConfigureAwait(false);
+
+                if (!response.IsSuccessStatusCode)
+                {
+                    throw new ApiException("Unsuccessful response from API", response);
+                }
+
+                using (response)
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+
+                    return await response.Content
+                        .ReadAsByteArrayAsync()
+                        .ConfigureAwait(false);
+                }
+            }
+        }
+
         public void ToFile(string filePath)
         {
             File.WriteAllBytes(filePath, this.ToByteArray());
@@ -186,7 +234,7 @@ public void ToFile(string filePath)
 
     public class ApiException : Exception
     {
-        public ApiException(string message, HttpResponseMessage response) : base(message) 
+        public ApiException(string message, HttpResponseMessage response) : base(message)
             => this.Response = response;
 
         public HttpResponseMessage Response { get; private set; }