Utilize ArrayBuilder

Author: TanayParikh

src/Components/Shared/src/ArrayBuilder.cs

@@ -14,6 +14,8 @@ namespace Ignitor
 namespace Microsoft.AspNetCore.Components.WebView
 #elif COMPONENTS_SERVER
 namespace Microsoft.AspNetCore.Components.Server.Circuits
+#elif JS_INTEROP
+namespace Microsoft.JSInterop.Infrastructure
 #else
 namespace Microsoft.AspNetCore.Components.RenderTree
 #endif

src/JSInterop/Microsoft.JSInterop/src/Infrastructure/ByteArrayJsonConverter.cs

@@ -21,7 +21,7 @@ internal sealed class ByteArrayJsonConverter : JsonConverter<byte[]>
         /// <summary>
         /// Contains the byte array(s) being serialized.
         /// </summary>
-        internal readonly List<byte[]> ByteArraysToSerialize = new();
+        internal readonly ArrayBuilder<byte[]> ByteArraysToSerialize = new();
 
         /// <summary>
         /// Sets the byte array(s) being deserialized.
@@ -106,7 +106,7 @@ public override void Write(Utf8JsonWriter writer, byte[] value, JsonSerializerOp
 
             var id = ByteArraysToSerialize.Count;
 
-            ByteArraysToSerialize.Add(value);
+            ByteArraysToSerialize.Append(value);
 
             writer.WriteStartObject();
             writer.WriteNumber(ByteArrayRefKey, id);

src/JSInterop/Microsoft.JSInterop/src/Infrastructure/DotNetDispatcher.cs

@@ -319,7 +319,9 @@ internal static SerializedArgs SerializeArgs(JSRuntime jsRuntime, object? args)
             }
 
             var serializedArgs = JsonSerializer.Serialize(args, jsRuntime.JsonSerializerOptions);
-            var byteArrays = jsRuntime.ByteArrayJsonConverter.ByteArraysToSerialize.ToArray();
+            var numByteArrays = jsRuntime.ByteArrayJsonConverter.ByteArraysToSerialize.Count;
+            var byteArrays = new byte[numByteArrays][];
+            Array.Copy(jsRuntime.ByteArrayJsonConverter.ByteArraysToSerialize.Buffer, byteArrays, numByteArrays);
             jsRuntime.ByteArrayJsonConverter.ByteArraysToSerialize.Clear();
             jsRuntime.ByteArrayJsonConverter.WriteSemaphore.Release();
 

src/JSInterop/Microsoft.JSInterop/src/Microsoft.JSInterop.csproj

@@ -8,11 +8,13 @@
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <Nullable>enable</Nullable>
     <Trimmable>true</Trimmable>
+    <DefineConstants>$(DefineConstants);JS_INTEROP</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>
     <Compile Include="$(SharedSourceRoot)JSInterop\JSCallResultTypeHelper.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)LinkerFlags.cs" LinkBase="Shared" />
+    <Compile Include="$(RepoRoot)\src\Components\Shared\src\ArrayBuilder.cs" />
   </ItemGroup>
 
   <ItemGroup>