Blazor WASM Server可以采用内存缓存或分布式缓存来实现缓存控制。下面是实现内存缓存的代码示例:
使用单例模式创建CacheService类:
public class CacheService
{
private readonly MemoryCache _cache;
public CacheService()
{
_cache = new MemoryCache(new MemoryCacheOptions());
}
public T Get(string cacheKey)
{
if (_cache.TryGetValue(cacheKey, out T cacheValue))
{
return cacheValue;
}
return default;
}
public void Set(string cacheKey, T cacheValue, TimeSpan cacheDuration)
{
var options = new MemoryCacheEntryOptions()
.SetSlidingExpiration(cacheDuration);
_cache.Set(cacheKey, cacheValue, options);
}
public void Remove(string cacheKey)
{
_cache.Remove(cacheKey);
}
}
然后在startup.cs文件里将服务注册到DI容器:
services.AddSingleton(typeof(CacheService));
在需要缓存的地方使用:
private readonly CacheService _cacheService;
public MyClass(CacheService cacheService)
{
_cacheService = cacheService;
}
public async Task GetDataAsync(int id)
{
var cacheKey = $"MyObject-{id}";
var cachedData = _cacheService.Get(cacheKey);
if (cachedData != null)
{
return cachedData;
}
var data = await GetDataFromServerAsync(id);
_cacheService.Set(cacheKey, data, TimeSpan.FromMinutes(30));
return data;
}
这个代码示例中,MyClass类从服务端获取MyObject对象,使用CacheService类实现内存缓存,缓存时间为30分钟。如果缓存已存在,则从缓存中返回数据,否则从服务端获取数据并将其缓存起来。