TagHelperInitializerOfT.cs

// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Razor.TagHelpers;

namespace Microsoft.AspNetCore.Mvc.Razor
{
    /// <inheritdoc />
    public class TagHelperInitializer<TTagHelper> : ITagHelperInitializer<TTagHelper>
        where TTagHelper : ITagHelper
    {
        private readonly Action<TTagHelper, ViewContext> _initializeDelegate;

        /// <summary>
        /// Creates a <see cref="TagHelperInitializer{TTagHelper}"/>.
        /// </summary>
        /// <param name="action">The initialization delegate.</param>
        public TagHelperInitializer(Action<TTagHelper, ViewContext> action)
        {
            if (action == null)
            {
                throw new ArgumentNullException(nameof(action));
            }

            _initializeDelegate = action;
        }

        /// <inheritdoc />
        public void Initialize(TTagHelper helper, ViewContext context)
        {
            if (helper == null)
            {
                throw new ArgumentNullException(nameof(helper));
            }

            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }

            _initializeDelegate(helper, context);
        }
    }
}