MemoryCache.Default not available in .NET Core?

MemoryCache.Default not available in .NET Core?

In .NET Core, the MemoryCache class is available in the Microsoft.Extensions.Caching.Memory package. Unlike in the full .NET Framework, it is not available in the System.Runtime.Caching namespace.

To use MemoryCache in a .NET Core application, you need to add a reference to the Microsoft.Extensions.Caching.Memory package in your project. You can do this using the NuGet Package Manager in Visual Studio or by editing your project file manually.

Here's an example of how to use MemoryCache in a .NET Core application:

using Microsoft.Extensions.Caching.Memory;

// ...

var cache = new MemoryCache(new MemoryCacheOptions());
var key = "myKey";
var value = "myValue";
cache.Set(key, value);

if (cache.TryGetValue(key, out object result))
{
    Console.WriteLine($"Cache hit: {result}");
}
else
{
    Console.WriteLine("Cache miss");
}

In this example, a new MemoryCache object is created with default options. The Set method is used to add a value to the cache with a specific key. The TryGetValue method is used to retrieve the value from the cache, and the result is printed to the console.

Note that MemoryCache is just one of several caching options available in .NET Core. Other options include IDistributedCache for distributed caching and IMemoryCache for in-memory caching with more fine-grained control over cache entry expiration and eviction policies.

Examples

  1. "MemoryCache.Default alternative in .NET Core"

    • Description: In .NET Core, MemoryCache.Default is not available. Instead, you can use the MemoryCache class directly. Here's an example of implementing a default cache in .NET Core:

      // Code
using Microsoft.Extensions.Caching.Memory;

// ...

var memoryCache = new MemoryCache(new MemoryCacheOptions());

  2. "How to use MemoryCache in .NET Core?"

    • Description: To utilize MemoryCache in .NET Core, you can instantiate it with the desired options. Here's a code snippet demonstrating basic usage:

      // Code
using Microsoft.Extensions.Caching.Memory;

// ...

var memoryCache = new MemoryCache(new MemoryCacheOptions());
memoryCache.Set("key", "value", TimeSpan.FromMinutes(10));

  3. "Caching strategies in .NET Core with MemoryCache"

    • Description: Explore various caching strategies with MemoryCache in .NET Core. For example, implement a sliding expiration strategy:

      // Code
memoryCache.Set("key", "value", new MemoryCacheEntryOptions
{
    SlidingExpiration = TimeSpan.FromMinutes(10)
});

  4. "Migrating from MemoryCache.Default to MemoryCache in .NET Core"

    • Description: If you're transitioning from the older MemoryCache.Default to the new MemoryCache in .NET Core, update your code like this:

      // Code
var memoryCache = new MemoryCache(new MemoryCacheOptions());

  5. "Handling cache expiration in .NET Core MemoryCache"

    • Description: Learn how to handle cache expiration scenarios in MemoryCache in .NET Core. Use the AbsoluteExpiration option for fixed-duration caching:

      // Code
memoryCache.Set("key", "value", new MemoryCacheEntryOptions
{
    AbsoluteExpiration = DateTime.Now.AddMinutes(10)
});

  6. "Global caching patterns in .NET Core"

    • Description: Implement a global caching pattern using a static MemoryCache instance for common data shared across the application:

      // Code
public static MemoryCache GlobalCache = new MemoryCache(new MemoryCacheOptions());

More Tags

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