csharp

name	csharp
description	C# programming language best practices and patterns
license	MIT
compatibility	opencode
metadata	{"audience":"developers","category":"programming"}

What I do

• Write idiomatic C# code
• Use .NET features effectively
• Implement async/await patterns
• Use LINQ for queries
• Apply SOLID principles
• Handle exceptions properly
• Use dependency injection
• Write unit tests

When to use me

When writing C# or .NET code.

C# Best Practices

// Async/await patterns
public async Task<UserDto> GetUserAsync(int id)
{
    return await _repository.GetByIdAsync(id)
        .ConfigureAwait(false);
}

// LINQ queries
var activeUsers = await _context.Users
    .Where(u => u.IsActive)
    .OrderBy(u => u.CreatedAt)
    .Skip(page * pageSize)
    .Take(pageSize)
    .ToListAsync();

// Dependency injection
services.AddScoped<IUserService, UserService>();
services.AddSingleton<IConfiguration>(Configuration);

// Records for DTOs
public record UserDto(
    int Id,
    string Email,
    string Name,
    DateTime CreatedAt);

// Pattern matching
public decimal CalculateDiscount(Order order) => order switch
{
    { IsPremium: true } => 0.2m,
    { Items.Count: > 10 } => 0.1m,
    { Total: > 100 } => 0.05m,
    _ => 0m
};