netcore/asp-netcore-session-sample/Middleware/HttpContextItemsMiddleware.cs

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;

namespace SessionSample.Middleware {
#region snippet1
  public class HttpContextItemsMiddleware {
    private readonly RequestDelegate _next;
    public static readonly object HttpContextItemsMiddlewareKey = new Object();

    public HttpContextItemsMiddleware(RequestDelegate next) {
      _next = next;
    }

    public async Task Invoke(HttpContext httpContext) {
      httpContext.Items[HttpContextItemsMiddlewareKey] = "K-9";

      await _next(httpContext);
    }
  }

  public static class HttpContextItemsMiddlewareExtensions {
    public static IApplicationBuilder UseHttpContextItemsMiddleware(this IApplicationBuilder app) {
      return app.UseMiddleware<HttpContextItemsMiddleware>();
    }
  }
#endregion
}