src/ZKEACMS/ModelBinder/WidgetTypeModelBinder.cs

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/* http://www.zkea.net/ 
 * Copyright (c) ZKEASOFT. All rights reserved. 
 * https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/ComplexTypeModelBinder.cs
 * http://www.zkea.net/licenses */

using Easy;
using Easy.MetaData;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading.Tasks;
using ZKEACMS.Widget;

namespace ZKEACMS.ModelBinder
{
    public class WidgetTypeModelBinder : IModelBinder
    {
        private IDictionary<Type, Func<object>> _modelCreator;
        private readonly ModelBinderProviderContext _modelBinderProviderContext;
        public WidgetTypeModelBinder(ModelBinderProviderContext modelBinderProviderContext)
        {
            _modelBinderProviderContext = modelBinderProviderContext;
            _modelCreator = new Dictionary<Type, Func<object>>();
        }

        public Task BindModelAsync(ModelBindingContext bindingContext)
        {

            var assembly = bindingContext.ValueProvider.GetValue("AssemblyName");
            var viewModelType = bindingContext.ValueProvider.GetValue("ViewModelTypeName");
            var widgetViewModelType = WidgetBase.KnownWidgetModel[$"{assembly.FirstValue},{viewModelType.FirstValue}"];

            var viewConfig = ServiceLocator.GetViewConfigure(widgetViewModelType);
            var modelMetadataProvider = bindingContext.HttpContext.RequestServices.GetService<IModelMetadataProvider>();
            bindingContext.ModelMetadata = modelMetadataProvider.GetMetadataForType(widgetViewModelType);

            if (!CanCreateModel(bindingContext))
            {
                return Task.CompletedTask;
            }

            return BindModelCoreAsync(bindingContext, viewConfig);
        }

        private async Task BindModelCoreAsync(ModelBindingContext bindingContext, ViewConfigure viewConfigure)
        {
            if (bindingContext.Model == null)
            {
                bindingContext.Model = CreateModel(bindingContext);
            }

            for (var i = 0; i < bindingContext.ModelMetadata.Properties.Count; i++)
            {
                var property = bindingContext.ModelMetadata.Properties[i];
                if (!CanBindProperty(bindingContext, property))
                {
                    continue;