first commit

DOAN.Common/DynamicApiSimple/JsonModelBinder.cs

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+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Newtonsoft.Json;
+
+namespace DOAN.Common.DynamicApiSimple;
+
+public class JsonModelBinder : IModelBinder
+{
+    private readonly IModelBinder _fallbackBinder;
+
+    public JsonModelBinder(IModelBinder fallbackBinder)
+    {
+        _fallbackBinder = fallbackBinder;
+    }
+
+    public async Task BindModelAsync(ModelBindingContext bindingContext)
+    {
+        if (bindingContext == null)
+        {
+            throw new ArgumentNullException(nameof(bindingContext));
+        }
+
+        var request = bindingContext.HttpContext.Request;
+        if ((request.Method == "POST" || request.Method == "PUT") && request.ContentType != null && request.ContentType.Contains("application/json"))
+        {
+            using (var reader = new StreamReader(request.Body))
+            {
+                var body = await reader.ReadToEndAsync();
+                if (!string.IsNullOrEmpty(body))
+                {
+                    var result = JsonConvert.DeserializeObject(body, bindingContext.ModelType);
+                    bindingContext.Result = ModelBindingResult.Success(result);
+                    return;
+                }
+            }
+        }
+
+        if (_fallbackBinder != null)
+        {
+            await _fallbackBinder.BindModelAsync(bindingContext);
+        }
+        else
+        {
+            bindingContext.Result = ModelBindingResult.Failed();
+        }
+    }
+}