10 Advanced C# Snippets Developer Productivity
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1. Pattern Matching with switch Expressions
public string GetUserType(User user) =>
user switch
{
{ IsAdmin: true } => "Admin",
{ IsPremium: true } => "Premium",
_ => "Regular"
};
2. Span<T> for Memory-efficient Data Manipulation
Span<int> numbers = stackalloc int[] { 1, 2, 3, 4, 5 };
for (int i = 0; i < numbers.Length; i++)
{
Console.WriteLine(numbers[i]);
}
3. Local functions for Better Code Structure
public void ProcessData()
{
Validate();
void Validate()
{
// Validation logic
}
}
4. Async Stream with IAsyncEnumerable<T>
Efficiently handle large data streams asynchronously
public async IAsyncEnumerable<int> GetNumbersAsync()
{
for (int i = 0; i < 10; i++)
{
await Task.Delay(100); // Simulate async work
yield return i;
}
}
5. Records for Immutable Data Structure
public record User(string Name, int Age);
6. Task.WhenAll() for Parallel Async Operations
public async Task ProcessDataAsync()
{
var tasks = new List<Task>
{
Task1(),
Task2(),
Task3()
};
await Task.WhenAll(tasks);
}
7. Nullable Reference Types
public void ProcessUser(User? user)
{
if (user is not null)
{
Console.WriteLine(user.Name);
}
}
8. Parallel.ForEach for Multithreading
Parallel.ForEach(dataList, data =>
{
ProcessData(data);
});
9. Dependency Injection in ASP.NET Core
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddScoped<IMyService, MyService>();
}
}
10. Expression Trees for Dynamic Code Generation
var param = Expression.Parameter(typeof(int), "x");
var body = Expression.Multiply(param, Expression.Constant(2));
var lambda = Expression.Lambda<Func<int, int>>(body, param).Compile();
Console.WriteLine(lambda(5)); // Outputs: 10