Update

ConsoleApp2/Cache/CacheKeys.cs

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+namespace ConsoleApp2.Cache;
+
+#nullable disable
+public static class CacheKeys
+{
+    public static Func<string, string> Order_OrderNo_CompanyID { get; set; }
+    public static Func<string, string> OrderBlockPlan_ID_CompanyID { get; set; }
+    public static Func<string, string> OrderProcess_ID_ShardKey { get; set; }
+}

ConsoleApp2/Cache/ICacher.cs

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+namespace ConsoleApp2.Cache;
+
+public interface ICacher
+{
+    Task<string?> GetStringAsync(string key);
+    Task SetStringAsync(string key, string value);
+    Task<bool> ExistsAsync(string key);
+    Task SetHashAsync(string key, IReadOnlyDictionary<string, string> hash);
+    Task<Dictionary<string, string>> GetHashAsync(string key);
+}

ConsoleApp2/Cache/RedisCache.cs

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+using ConsoleApp2.Options;
+using Microsoft.Extensions.DependencyInjection;
+using StackExchange.Redis;
+
+namespace ConsoleApp2.Cache;
+
+public class RedisCache : ICacher
+{
+    private readonly IDatabase _db;
+
+    public string KeyPrefix { get; set; }
+
+    public RedisCache(IConnectionMultiplexer conn, int dataBase, string keyPrefix = "")
+    {
+        _db = conn.GetDatabase(dataBase);
+        KeyPrefix = keyPrefix;
+    }
+
+    public async Task<string?> GetStringAsync(string key)
+    {
+        var value = await _db.StringGetAsync($"{KeyPrefix}{key}");
+        return !value.HasValue ? null : value.ToString();
+    }
+
+    public async Task SetStringAsync(string key, string value)
+    {
+        if (!await _db.StringSetAsync($"{KeyPrefix}{key}", value))
+            throw new RedisCommandException("设置Redis缓存失败");
+    }
+
+    public Task<bool> ExistsAsync(string key)
+    {
+        return _db.KeyExistsAsync($"{KeyPrefix}{key}");
+    }
+
+    public Task SetHashAsync(string key, IReadOnlyDictionary<string, string> hash)
+    {
+        return _db.HashSetAsync($"{KeyPrefix}{key}", hash.Select(pair => new HashEntry(pair.Key, pair.Value)).ToArray());
+    }
+
+    public async Task<Dictionary<string, string>> GetHashAsync(string key)
+    {
+        var entries = await _db.HashGetAllAsync($"{KeyPrefix}{key}");
+        var result = new Dictionary<string, string>();
+        foreach (var entry in entries)
+        {
+            result.Add(entry.Name.ToString(), entry.Value.ToString());
+        }
+
+        return result;
+    }
+}
+
+public static class RedisCacheExtensions
+{
+    public static IServiceCollection AddRedisCache(this IServiceCollection services, RedisCacheOptions options)
+    {
+        var conn = ConnectionMultiplexer.Connect(options.Configuration 
+                                                 ?? throw new ApplicationException("未配置Redis连接字符串"));
+        services.AddSingleton<ICacher>(new RedisCache(conn, options.Database, options.InstanceName));
+        return services;
+    }
+}