graphql fluent validation implementation with middleware.

PoweredSoft.CQRS.GraphQL.Abstractions/IGraphQLFieldError.cs

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+using System.Collections.Generic;
+
+namespace PoweredSoft.CQRS.GraphQL.Abstractions
+{
+    public interface IGraphQLFieldError
+    {
+        string Field { get; set; }
+        List<string> Errors { get; set; }
+    }
+}

PoweredSoft.CQRS.GraphQL.Abstractions/IGraphQLValidationResult.cs

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+using System.Collections.Generic;
+
+namespace PoweredSoft.CQRS.GraphQL.Abstractions
+{
+    public interface IGraphQLValidationResult
+    {
+        bool IsValid { get; }
+
+        List<IGraphQLFieldError> Errors { get; }
+    }
+}

PoweredSoft.CQRS.GraphQL.Abstractions/IGraphQLValidationService.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace PoweredSoft.CQRS.GraphQL.Abstractions
+{
+
+    public interface IGraphQLValidationService
+    {
+        Task<IGraphQLValidationResult> ValidateObjectAsync(object subject, CancellationToken cancellationToken = default);
+        Task<IGraphQLValidationResult> ValidateAsync<T>(T subject, CancellationToken cancellationToken = default);
+    }
+}

PoweredSoft.CQRS.GraphQL.Abstractions/PoweredSoft.CQRS.GraphQL.Abstractions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>