Linger.EFCore 0.2.0-alpha

Linger.EFCore

A C# Entity Framework Core helper library that provides enhanced query filter capabilities and property conversion extensions for .NET 9.0 and .NET 8.0.

Introduction

Linger.EFCore extends Entity Framework Core with powerful features including global query filters and property type conversions, making it easier to work with complex data types and filtering scenarios.

Features

Global Query Filters

• Apply filters automatically to entities implementing specific interfaces
• Apply filters based on property values
• Type-safe filter expressions
• Supports all Entity Framework Core query scenarios

Property Conversions

• JSON serialization support for complex types
• Conversion for string collections
• Custom value comparers
• Flexible configuration options

Usage Examples

JSON Property Conversion

public class User
{ 
    public int Id { get; set; }
    public UserSettings? Settings { get; set; }
}

protected override void OnModelCreating(ModelBuilder modelBuilder) 
{ 
    modelBuilder.Entity<User>().Property(x => x.Settings).HasJsonConversion(); 
}

String Collection Conversion

public class Product 
{ 
    public int Id { get; set; }
    public ICollection? Tags { get; set; }
}

protected override void OnModelCreating(ModelBuilder modelBuilder) 
{
    modelBuilder.Entity<Product>().Property(x => x.Tags).HasStringCollectionConversion(separator: ","); 
}

Interface-based Filtering

// Define your interface 
public interface ISoftDelete { bool IsDeleted { get; set; } }

// Implement the interface in your entities 
public class User : ISoftDelete 
{
    public int Id { get; set; }
    public string Name { get; set; }
    public bool IsDeleted { get; set; } 
}

// Apply the filter in your DbContext 
protected override void OnModelCreating(ModelBuilder modelBuilder) 
{ 
    // This will automatically filter out soft-deleted entities 
    modelBuilder.ApplyGlobalFilters(x => !x.IsDeleted); 
}

Property-based Filtering

// Multi-tenant filtering example 
public class ApplicationDbContext : DbContext 
{
    private readonly int _currentTenantId;
    public ApplicationDbContext(int currentTenantId)
    {
        _currentTenantId = currentTenantId;
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // This will automatically filter entities by tenant
        modelBuilder.ApplyGlobalFilters("TenantId", _currentTenantId);
    }
}

Install

From Visual Studio

1. Open the Solution Explorer.
2. Right-click on a project within your solution.
3. Click on Manage NuGet Packages....
4. Click on the Browse tab and search for "Linger.EFCore".
5. Click on the Linger.EFCore package, select the appropriate version and click Install.

Package Manager Console

PM> Install-Package Linger.EFCore

.NET CLI Console

> dotnet add package Linger.EFCore