all posts Библиотека шарписта | C#, F#, .NET, ASP.NET

dotnet tool install -g csharprepl

MemoryCache

public async Task GetBlogPost(int id)
{
    var cacheKey = $"BlogPost_{id}";
    if (!_memoryCache.TryGetValue(cacheKey, out BlogPost blogPost))
    {
        blogPost = await _blogRepository.GetBlogPostByIdAsync(id);
        _memoryCache.Set(cacheKey, blogPost);
    }
    return Ok(blogPost);
}

MemoryCache

public async Task GetBlogPost(int id)
{
    var cacheKey = $"BlogPost_{id}";
    var blogPost = await _memoryCache.GetOrCreateAsync(cacheKey, async entry =>
    {
        return await _blogRepository.GetBlogPostByIdAsync(id);
    });
    return Ok(blogPost);
}

IDistributedCache

builder.Services.AddStackExchangeRedisCache(options => { ... });

builder.Services.AddDistributedSqlServerCache(options =>
{
    options.ConnectionString = builder.Configuration.GetConnectionString("DistCache_ConnectionString");
    options.SchemaName = "dbo";
    options.TableName = "TestCache";
});

IDistributedCache

public class SomeService(IDistributedCache cache)
{
    public async Task GetSomeInformationAsync(string name, int id, CancellationToken token = default)
    {
        var key = $"someinfo:{name}:{id}";
        var bytes = await cache.GetAsync(key, token);
        SomeInformation info;
        if (bytes is null)
        {
            info = await SomeExpensiveOperationAsync(name, id, token);
            bytes = SomeSerializer.Serialize(info);
            await cache.SetAsync(key, bytes, token);
        }
        else
        {
            info = SomeSerializer.Deserialize(bytes);
        }
        return info;
    }

    private async Task SomeExpensiveOperationAsync(string name, int id, CancellationToken token = default)
    {
        // ... Реализация
    }
}

HybridCache

MemoryCache

DistributedCache

public class SomeService(HybridCache cache)
{
    public async Task GetSomeInformationAsync(string name, int id, CancellationToken token = default)
    {
        return await cache.GetOrCreateAsync(
            $"someinfo:{name}:{id}",
            async cancel => await SomeExpensiveOperationAsync(name, id, cancel),
            token: token
        );
    }
}

HybridCache

IDistributedCache

StringSyntax

sudo apt update
sudo apt install dotnet8

TouchBehavior

TouchEffect`), изменения в работе `Snackbar

TouchEffect

PlatformBehaviors

TouchBehavior

TouchBehavior

TouchBehavior

record

OrderBy.ToList

OrderBy

Chunk

Array<T>

Chunk

ReadOnlySpan

OfType

Cast

OfType

Cast

Any

Any

TryGetNonEnumeratedCount

Any

Invoke-Command

-AsJob

HttpClient

429 Too Many Requests

 System.InvalidOperationException: Collection was modified; enumeration operation may not execute.?

 version,

 version.

 MoveNext() 

 version 

 InvalidOperationException.

DbUpdateException

DbException

EntityFramework.Exceptions

DbContext

UseExceptionProcessor

UniqueConstraintException

CannotInsertNullException

MaxLengthExceededException

NumericOverflowException

ReferenceConstraintException

UniqueConstraintException

ReferenceConstraintException

ConstraintName

ConstraintProperties

[MemberNotNullWhen]

NULL

readonly

readonly

readonly

readonly

TryGetNonEnumeratedCount

IQueryable

Count

Equals

GetHashCode

GetHashCode