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 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#入門知識 >> 文件緩存,php文件緩存

文件緩存,php文件緩存

編輯:C#入門知識

文件緩存,php文件緩存


緩存存儲在文件中,根據過期時間過期,也可以手動刪除。IIS回收進程時緩存不丟失。

代碼:

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Runtime.Serialization.Formatters.Binary; using System.Threading; namespace Common.Utils { /// <summary> /// 緩存工具類 /// </summary> public static class CacheUtil { #region 變量 /// <summary> /// 緩存路徑 /// </summary> private static string folderPath = Application.StartupPath + "\\cache"; /// <summary> /// 鎖 /// </summary> private static object _lock = new object(); private static BinaryFormatter formatter = new BinaryFormatter(); #endregion #region 構造函數 static CacheUtil() { if (!Directory.Exists(folderPath)) { Directory.CreateDirectory(folderPath); } } #endregion #region SetValue 保存鍵值對 /// <summary> /// 保存鍵值對 /// </summary> public static void SetValue(string key, object value, int expirationMinutes = 0) { CacheData data = new CacheData(key, value); data.updateTime = DateTime.Now; data.expirationMinutes = expirationMinutes; string keyMd5 = GetMD5(key); string path = folderPath + "\\" + keyMd5 + ".txt"; lock (_lock) { using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)) { fs.SetLength(0); formatter.Serialize(fs, data); fs.Close(); } } } #endregion #region GetValue 獲取鍵值對 /// <summary> /// 獲取鍵值對 /// </summary> public static object GetValue(string key) { string keyMd5 = GetMD5(key); string path = folderPath + "\\" + keyMd5 + ".txt"; if (File.Exists(path)) { using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read)) { CacheData data = (CacheData)formatter.Deserialize(fs); fs.Close(); if (data.expirationMinutes > 0 && DateTime.Now.Subtract(data.updateTime).TotalMinutes > data.expirationMinutes) { File.Delete(path); return null; } return data.value; } } return null; } #endregion #region Delete 刪除 /// <summary> /// 刪除 /// </summary> public static void Delete(string key) { string keyMd5 = GetMD5(key); string path = folderPath + "\\" + keyMd5 + ".txt"; if (File.Exists(path)) { lock (_lock) { File.Delete(path); } } } #endregion #region DeleteAll 全部刪除 /// <summary> /// 全部刪除 /// </summary> public static void DeleteAll() { string[] files = Directory.GetFiles(folderPath); foreach (string file in files) { File.Delete(file); } } #endregion #region 計算MD5值 /// <summary> /// 計算MD5值 /// </summary> private static string GetMD5(string value) { string base64 = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(value)).Replace("/", "-"); if (base64.Length > 200) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); byte[] bArr = md5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(value)); StringBuilder sb = new StringBuilder(); foreach (byte b in bArr) { sb.Append(b.ToString("x2")); } return sb.ToString(); } return base64; } #endregion } #region CacheData 緩存數據 /// <summary> /// 緩存數據 /// </summary> [Serializable] public class CacheData { /// <summary> /// 鍵 /// </summary> public string key { get; set; } /// <summary> /// 值 /// </summary> public object value { get; set; } /// <summary> /// 緩存更新時間 /// </summary> public DateTime updateTime { get; set; } /// <summary> /// 過期時間(分鐘),0表示永不過期 /// </summary> public int expirationMinutes { get; set; } public CacheData(string key, object value) { this.key = key; this.value = value; } } #endregion } View Code

 

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