：.NET Core: EnyimMemcachedCore

客户端介绍

EnyimMemcachedCore 是一个从 EnyimMemcached 迁移至 .NET Core 的 Memcached 客户端，支持 .NET Core。

• 源代码托管在 GitHub 上的地址：https://github.com/cnblogs/EnyimMemcachedCore

• NuGet 包地址：https://www.nuget.org/packages/EnyimMemcachedCore

1. 安装 NuGet 包

Install-Package EnyimMemcachedCore

2. 配置

2.1 在 appsetting.json 中进行配置

• 不带验证的配置

{
  "enyimMemcached": {
    "Servers": [
      {
        "Address": "memcached",
        "Port": 11211
      }
    ]
  }
}

• 带验证的配置

{
  "enyimMemcached": {
    "Servers": [
      {
        "Address": "memcached",
        "Port": 11211
      }
    ],
    "Authentication": {
      "Type": "Enyim.Caching.Memcached.PlainTextAuthenticator",
      "Parameters": {
        "zone": "",
        "userName": "username",
        "password": "password"
      }
    }
  }
}

• Startup.cs 中的配置代码

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddEnyimMemcached(options => Configuration.GetSection("enyimMemcached").Bind(options));
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    { 
        app.UseEnyimMemcached();
    }
}

2.2 直接硬编码配置（无需配置文件）

Startup.cs 中的硬编码配置代码

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddEnyimMemcached(options =>
        {
            options.AddServer("memcached", 11211);                
            //options.AddPlainTextAuthenticator("", "usename", "password");
        });
    }        

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        app.UseEnyimMemcached();
    }
}

3. 调用

3.1 使用 IMemcachedClient 接口

public class TabNavService
{
    private ITabNavRepository _tabNavRepository;
    private IMemcachedClient _memcachedClient;

    public TabNavService(
        ITabNavRepository tabNavRepository,
        IMemcachedClient memcachedClient)
    {
        _tabNavRepository = tabNavRepository;
        _memcachedClient = memcachedClient;
    }

    public async Task<IEnumerable<TabNav>> GetAll()
    {
        var cacheKey = "aboutus_tabnavs_all";
        var result = await _memcachedClient.GetAsync<IEnumerable<TabNav>>(cacheKey);
        if (!result.Success)
        {
            var tabNavs = await _tabNavRepository.GetAll();
            await _memcachedClient.AddAsync(cacheKey, tabNavs, 300);
            return tabNavs;
        }
        else
        {
            return result.Value;
        }
    }
}

3.2 使用 IDistributedCache 接口（来自 Microsoft.Extensions.Caching.Abstractions ）

public class CreativeService
{
    private ICreativeRepository _creativeRepository;
    private IDistributedCache _cache;

    public CreativeService(
        ICreativeRepository creativeRepository,
        IDistributedCache cache)
    {
        _creativeRepository = creativeRepository;
        _cache = cache;
    }

    public async Task<IList<CreativeDTO>> GetCreatives(string unitName)
    {
        var cacheKey = $"creatives_{unitName}";
        IList<CreativeDTO> creatives = null;

        var creativesJson = await _cache.GetStringAsync(cacheKey);
        if (creativesJson == null)
        {
            creatives = await _creativeRepository.GetCreatives(unitName)
                    .ProjectTo<CreativeDTO>().ToListAsync();

            var json = string.Empty;
            if (creatives != null && creatives.Count() > 0)
            {
                json = JsonConvert.SerializeObject(creatives);
            }
            await _cache.SetStringAsync(
                cacheKey, 
                json, 
                new DistributedCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(5)));
        }
        else
        {
            creatives = JsonConvert.DeserializeObject<List<CreativeDTO>>(creativesJson);
        }

        return creatives;
    }
}