csharp ASP.NET MVC WebViewPageExtensions

Posted 2021-05-12

using System;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Web.WebPages;
using System.Linq;

public static class WebViewPageExtensions
{
    /// <summary>
    /// Functionality similar to the controller's TryUpdateModel() protected method
    /// </summary>
    public static bool TryUpdateModel<TModel>(this WebViewPage page, TModel model, string prefix = "") where TModel : class
    {
        if (model == null)
        {
            throw new ArgumentNullException("model");
        }

        var pageModelState = page.ViewData.ModelState;

        var bindingContext = new ModelBindingContext
        {
            ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => model, typeof(TModel)),
            ModelName = prefix,
            ModelState = pageModelState,
            //PropertyFilter = propertyFilter,
            ValueProvider = page.ViewContext.Controller.ValueProvider
        };
        var binder = ModelBinders.Binders.GetBinder(typeof(TModel));
        binder.BindModel(page.ViewContext.Controller.ControllerContext, bindingContext);

        return pageModelState.IsValid;
    }

    /// <summary>
    /// Uses TemplateStack.Stack to return parents
    /// </summary>
    /// <param name="page"></param>
    /// <returns></returns>
    public static IEnumerable<WebPageRenderingBase> GetPageStack(this WebPageRenderingBase page)
    {
        var method = typeof(TemplateStack).GetMethod("GetStack", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);
        var res = method.Invoke(null, new object[] { page.Context }) as Stack<ITemplateFile>;
        return res.OfType<WebPageRenderingBase>();
    }

    /// <summary>
    /// Uses TemplateStack.Stack to return parent
    /// </summary>
    /// <param name="page"></param>
    /// <returns></returns>
    public static WebPageRenderingBase GetPageParent(this WebPageRenderingBase page)
    {
        return GetPageStack(page).Skip(1).FirstOrDefault();
    }
}