Question

我想将一些代码升级到ASP.NET Core 2。我知道HttpContext.Current已从ASP.NET Core 2移除，必须使用IHttpContextAccessor。

但我不知道如何替换这段代码：

HttpContext.Current.Items.Contains（DataContextKey）

我该怎么做？

完整的代码：

namespace Jahan.Infrastructure.DataAccess.DataContextStorage
{
    public class HttpDataContextStorageContainer<T> : IDataContextStorageContainer<T> where T : class
    {
        private const string DataContextKey = "DataContext";

        public T GetDataContext()
        {
            T objectContext = null;
            if (HttpContext.Current.Items.Contains(DataContextKey))
            {
                objectContext = (T)HttpContext.Current.Items[DataContextKey];
            }
            return objectContext;
        }

        public void Clear()
        {
            if (HttpContext.Current.Items.Contains(DataContextKey))
            {
                HttpContext.Current.Items[DataContextKey] = null;
            }
        }

        public void Store(T objectContext)
        {
            if (HttpContext.Current.Items.Contains(DataContextKey))
            {
                HttpContext.Current.Items[DataContextKey] = objectContext;
            }
            else
            {
                HttpContext.Current.Items.Add(DataContextKey, objectContext);
            }
        }
    }
}

Answer 1

注入HttpContext并通过该访问权限访问当前public class HttpDataContextStorageContainer<T> : IDataContextStorageContainer<T> where T : class { private const string DataContextKey = "DataContext"; private readonly IHttpContextAccessor accessor; public HttpDataContextStorageContainer(IHttpContextAccessor accessor) { this.accessor = accessor; } public T GetDataContext() { var current = accessor.HttpContext; T objectContext = null; if (current.Items.ContainsKey(DataContextKey)) { objectContext = (T)current.Items[DataContextKey]; } return objectContext; } public void Clear() { var current = accessor.HttpContext; if (current.Items.ContainsKey(DataContextKey)) { current.Items[DataContextKey] = null; } } public void Store(T objectContext) { var current = accessor.HttpContext; if (current.Items.ContainsKey(DataContextKey)) { current.Items[DataContextKey] = objectContext; } else { current.Items.Add(DataContextKey, objectContext); } } }。其余的应该足够简单，可以重构。

例如。

IHttpContextAccessor

确保services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();及其实现已在服务容器中注册。默认情况下不再添加它。

{
  "0" : {
    "Coordinates" : {
      "Lat" : -29.00902,
      "Long" : 31.98
    }
  },
  "1" : {
    "Coordinates" : {
      "Lat" : -28.8,
      "Long" : 30.00007
    }
  },
  "num" : 1
}

ASP.NET Core 2中HttpContext.Current.Items.Contains（DataContextKey）的替代方法

1 个答案: