添加项目文件。

common/Tnb.CollectiveOAuth/Cache/DefaultAuthStateCache.cs

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+namespace JNPF.Extras.CollectiveOAuth.Cache;
+
+/// <summary>
+/// 授权状态默认缓存.
+/// </summary>
+public class DefaultAuthStateCache : IAuthStateCache
+{
+    /// <summary>
+    /// 默认缓存前缀.
+    /// </summary>
+    private static string Default_Cache_Prefix = "CollectiveOAuth_Status_";
+
+    /// <summary>
+    /// 保存缓存.
+    /// </summary>
+    /// <param name="key">键.</param>
+    /// <param name="value">值.</param>
+    public void cache(string key, string value)
+    {
+        HttpRuntimeCache.Set($"{Default_Cache_Prefix}{key}", value);
+    }
+
+    /// <summary>
+    /// 保存缓存.
+    /// </summary>
+    /// <param name="key">键.</param>
+    /// <param name="value">值.</param>
+    /// <param name="timeout">过期时间戳.</param>
+    public void cache(string key, string value, long timeout)
+    {
+        HttpRuntimeCache.Set($"{Default_Cache_Prefix}{key}", value, timeout);
+    }
+
+    /// <summary>
+    /// 是否存在.
+    /// </summary>
+    /// <param name="key">键.</param>
+    /// <returns>true or false.</returns>
+    public bool containsKey(string key)
+    {
+        var cacheObj = HttpRuntimeCache.Get($"{Default_Cache_Prefix}{key}");
+        if (cacheObj != null)
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// 取值缓存.
+    /// </summary>
+    /// <param name="key">键.</param>
+    /// <returns></returns>
+    public string get(string key)
+    {
+        var cacheObj = HttpRuntimeCache.Get($"{Default_Cache_Prefix}{key}");
+        if (cacheObj != null)
+        {
+            return Convert.ToString(cacheObj);
+        }
+        else
+        {
+            return null;
+        }
+    }
+}

common/Tnb.CollectiveOAuth/Cache/HttpRuntimeCache.cs

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+using Microsoft.Extensions.Caching.Memory;
+
+namespace JNPF.Extras.CollectiveOAuth.Cache;
+
+/// <summary>
+/// http运行时缓存.
+/// </summary>
+public class HttpRuntimeCache
+{
+    /// <summary>
+    /// 缓存.
+    /// </summary>
+    public static IMemoryCache memoryCache = new MemoryCache(new MemoryCacheOptions() { });
+
+    /// <summary>
+    /// 获取数据缓存.
+    /// </summary>
+    /// <param name="CacheKey">键.</param>
+    public static object Get(string CacheKey)
+    {
+        memoryCache.TryGetValue(CacheKey, out object result);
+        return result;
+    }
+
+    /// <summary>
+    /// 设置数据缓存
+    /// 变化时间过期（平滑过期）。表示缓存连续2个小时没有访问就过期（TimeSpan.FromSeconds(7200)）.
+    /// </summary>
+    /// <param name="CacheKey">键.</param>
+    /// <param name="objObject">值.</param>
+    /// <param name="Second">过期时间，默认7200秒.</param>
+    /// <param name="Sliding">是否相对过期，默认是；否，则固定时间过期.</param>
+    public static void Set(string CacheKey, object objObject, long Second = 7200, bool Sliding = true) =>
+        memoryCache.Set(CacheKey, objObject, Sliding ?
+            new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromSeconds(Second)) :
+            new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromSeconds(Second)));
+
+    /// <summary>
+    /// 移除指定数据缓存.
+    /// </summary>
+    /// <param name="CacheKey">键.</param>
+    public static void Remove(string CacheKey) => memoryCache.Remove(CacheKey);
+
+    /// <summary>
+    /// 移除全部缓存.
+    /// </summary>
+    public static void RemoveAll() => memoryCache.Dispose();
+}

common/Tnb.CollectiveOAuth/Cache/IAuthStateCache.cs

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+namespace JNPF.Extras.CollectiveOAuth.Cache;
+
+/// <summary>
+/// 授权状态缓存抽象类.
+/// </summary>
+public interface IAuthStateCache
+{
+    /// <summary>
+    /// 存入缓存.
+    /// </summary>
+    /// <param name="key">缓存key.</param>
+    /// <param name="value">缓存内容.</param>
+    void cache(string key, string value);
+
+    /// <summary>
+    /// 存入缓存.
+    /// </summary>
+    /// <param name="key">缓存key.</param>
+    /// <param name="value">缓存内容.</param>
+    /// <param name="timeout">指定缓存过期时间（毫秒）.</param>
+    void cache(string key, string value, long timeout);
+
+    /// <summary>
+    /// 获取缓存内容.
+    /// </summary>
+    /// <param name="key">缓存key.</param>
+    /// <returns>缓存内容.</returns>
+    string get(string key);
+
+    /// <summary>
+    /// 是否存在key，如果对应key的value值已过期，也返回false.
+    /// </summary>
+    /// <param name="key">缓存key.</param>
+    /// <returns>true：存在key，并且value没过期；false：key不存在或者已过期.</returns>
+    bool containsKey(string key);
+}