///// <summary>
///// 设置全局数据缓存，如果存在仅修改值
///// </summary>
///// <param name="context">HttpContext</param>
///// <param name="cacheKey">键值名称</param>
///// <param name="objObject">值</param>
//public static void SetCache(this HttpContext context, string cacheKey, object objObject)
//{
// if (string.IsNullOrWhiteSpace(cacheKey))
// {
// throw new System.SystemException("键值名称不能为空！");
// }
// if (context.Cache == null || context.Cache[cacheKey] == null)
// {
// context.Cache.Insert(cacheKey, objObject);
// return;
// }
// context.Cache[cacheKey] = objObject;
//}
///// <summary>
///// 设置数据缓存
///// </summary>
///// <param name="context">HttpContext</param>
///// <param name="cacheKey">键值名称</param>
///// <param name="objObject">值</param>
///// <param name="timeout">单位秒，默认7200秒</param>
//public static void SetCache(this HttpContext context, string cacheKey, object objObject, int timeout = 7200)
//{
// if (string.IsNullOrWhiteSpace(cacheKey))
// {
// throw new System.SystemException("键值名称不能为空！");
// }
// //相对过期
// //context.Cache.Insert(cacheKey, objObject, null, DateTime.MaxValue, timeout, CacheItemPriority.NotRemovable, null);
// //绝对过期时间
// context.Cache.Insert(cacheKey, objObject, null, DateTime.Now.AddSeconds(timeout), TimeSpan.Zero, System.Web.Caching.CacheItemPriority.High, null);
//}
///// <summary>
///// 获取数据缓存
///// </summary>
///// <param name="context">HttpContext</param>
///// <param name="cacheKey">键</param>
///// <returns>返回一个值，如果键值名称不存在则返回NULL</returns>
//public static object GetCache(this HttpContext context, string cacheKey)
//{
// if (string.IsNullOrWhiteSpace(cacheKey))
// {
// throw new System.SystemException("键值名称不能为空！");
// }
// if (context.Cache == null || context.Cache[cacheKey] == null)
// {
// return null;
// }
// return context.Cache.Get(cacheKey); ;
//}
///// <summary>
///// 移除指定数据缓存
///// </summary>
///// <param name="context">HttpContext</param>
///// <param name="cacheKey">键</param>
//public static void RemoveCache(this HttpContext context, string cacheKey)
//{
// if (string.IsNullOrWhiteSpace(cacheKey))
// {
// throw new System.SystemException("键值名称不能为空！");
// }
// if (context.Cache == null || context.Cache[cacheKey] == null)
// {
// return;
// }
// context.Cache.Remove(cacheKey);
//}
///// <summary>
///// 移除全部缓存
///// </summary>
///// <param name="context">HttpContext</param>
//public static void RemoveAllCache(this HttpContext context)
//{
// if (context.Cache == null)
// {
// return;
// }
// var cacheEnum = context.Cache.GetEnumerator();
// while (cacheEnum.MoveNext())
// {
// context.Cache.Remove(cacheEnum.Key.ToString());
// }
//}
///// <summary>
///// 调用此方法可以对请求的信息进行压缩处理
///// </summary>
///// <param name="reques"><see cref="HttpContext"/>对象</param>
///// <returns>返回当前发起请求的用户浏览器是否支持压缩信息 状态：<see cref="bool"/>类型</returns>
//public static bool Deflate_Gzip(this HttpContext reques)
//{
// string Accept = reques.Request.Headers["Accept-Encoding"];
// if (string.IsNullOrWhiteSpace(Accept))
// {
// return false;
// }
// if (Accept.Contains("gzip"))
// {
// reques.Response.AppendHeader("Content-Encoding", "gzip");
// reques.Response.Filter = new GZipStream(reques.Response.Filter, CompressionMode.Compress);
// return true;
// }
// else if (Accept.Contains("deflate"))
// {
// reques.Response.AppendHeader("Content-Encoding", "deflate");
// reques.Response.Filter = new DeflateStream(reques.Response.Filter, CompressionMode.Compress);
// return true;
// }
// return false;
//}
///// <summary>
///// 调用此方法可以对请求的信息进行压缩处理
///// </summary>
///// <param name="reques"><see cref="HttpContext"/>对象</param>
///// <param name="httpEncoding">压缩枚举</param>
///// <returns>返回当前发起请求的用户浏览器是否支持压缩信息 状态：<see cref="bool"/>类型</returns>
//public static bool Deflate_Gzip(this HttpContext reques, HttpEncoding httpEncoding)
//{
// string Accept = reques.Request.Headers["Accept-Encoding"];
// if (string.IsNullOrWhiteSpace(Accept))
// {
// return false;
// }
// if (httpEncoding == HttpEncoding.gzip)
// {
// if (Accept.Contains("gzip"))
// {
// reques.Response.AppendHeader("Content-Encoding", "gzip");
// reques.Response.Filter = new GZipStream(reques.Response.Filter, CompressionMode.Compress);
// return true;
// }
// else
// {
// return true;
// }
// }
// else if (httpEncoding == HttpEncoding.deflate)
// {
// if (Accept.Contains("deflate"))
// {
// reques.Response.AppendHeader("Content-Encoding", "deflate");
// reques.Response.Filter = new DeflateStream(reques.Response.Filter, CompressionMode.Compress);
// return true;
// }
// else
// {
// return true;
// }
// }
// return false;
//}
///// <summary>
///// 解开以压缩的输出流
///// </summary>
///// <param name="reques"><see cref="HttpContext"/>对象</param>
///// <returns>返回状态</returns>
//public static bool DecodeDeflate_Gzip(this HttpContext reques)
//{
// string Content = reques.Response.Headers["Content-Encoding"];
// if (string.IsNullOrWhiteSpace(Content))
// {
// return false;
// }
// if (Content.Contains("deflate"))
// {
// //reques.Response.Headers.Remove("Accept-Encoding");
// reques.Response.Headers.Remove("Content-Encoding");
// reques.Response.Filter = new DeflateStream(reques.Response.Filter, CompressionMode.Decompress);
// return true;
// }
// else if (Content.Contains("gzip"))
// {
// //reques.Response.Headers.Remove("Accept-Encoding");
// reques.Response.Headers.Remove("Content-Encoding");
// reques.Response.Filter = new GZipStream(reques.Response.Filter, CompressionMode.Decompress);
// return true;
// }
// return false;
//}
/// <summary>
/// 将文件流分流写入
/// </summary>
/// <param name="ReadStream">原文件流</param>
/// <param name="WriteStream">更新文件流</param>
/// <param name="minlen">最小资源大小</param>
/// <returns></returns>
public static async System.Threading.Tasks.Task StreamMove(System.IO.Stream ReadStream, System.IO.Stream WriteStream, int minlen)
{
long length = ReadStream.Length;
long len = (minlen) > length ? length : (minlen);
byte[] slice = new byte[len];
long seekiength = 0;
do
{
int i = await ReadStream.ReadAsync(slice.AsMemory(0, slice.Length));
await WriteStream.WriteAsync(slice.AsMemory(0, i));
await WriteStream.FlushAsync();
seekiength += i;
Array.Clear(slice, 0, i);
} while (length > seekiength);
await ReadStream.DisposeAsync();
}
