Linqraft.SourceGenerator 0.8.1

Linqraft

Linqraft is a Roslyn Source Generator for easily writing IQueryable projections.

• Query-based automatic DTO generation
  • You can freely define DTO structures in the query without predefining them.
  • Based on anonymous types, "what you see is what you get" declarations.
  • Supports nested DTOs, collections, and calculated fields.
• Null-propagation operator support (?.) in Expression Trees
  • No more need to write o.Customer != null ? o.Customer.Name : null.
• Zero-dependency
  • No runtime dependencies are required since it uses Source Generators and Interceptors.

For Example:

var orders = await dbContext.Orders
    // Order: input entity type
    // OrderDto: output DTO type (auto-generated)
    .SelectExpr<Order, OrderDto>(o => new
    {
        // can use inferred member names
        o.Id,
        // null-propagation supported
        // you can create flattened structures easily
        CustomerName = o.Customer?.Name,
        // also works for nested objects
        CustomerCountry = o.Customer?.Address?.Country?.Name,
        CustomerCity = o.Customer?.Address?.City?.Name,
        // you can use anonymous types inside. great for grouping
        CustomerInfo = new
        {
            Email = o.Customer?.EmailAddress,
            Phone = o.Customer?.PhoneNumber,
        },
        // calculated fields? no problem!
        LatestOrderDate = o.OrderItems.Max(oi => oi.OrderDate),
        TotalAmount = o.OrderItems.Sum(oi => oi.Quantity * oi.UnitPrice),
        // collections available
        Items = o.OrderItems.Select(oi => new
        {
            // of course, features work here too
            ProductName = oi.Product?.Name,
            oi.Quantity
        }),
    })
    .ToListAsync();

will be generated as:

// <auto-generated>
// This file is auto-generated by Linqraft 
// </auto-generated>
#nullable enable
#pragma warning disable IDE0060
#pragma warning disable CS8601
#pragma warning disable CS8602
#pragma warning disable CS8603
#pragma warning disable CS8604
#pragma warning disable CS8618
using System;
using System.Linq;
using System.Collections.Generic;
namespace Linqraft
{
    file static partial class GeneratedExpression
    {
        [global::System.Runtime.CompilerServices.InterceptsLocationAttribute(1, "HWIj1D9ydZTCzRj7o0y/oYkBAABUdXRvcmlhbENhc2VUZXN0LmNz")]
        public static IQueryable<TResult> SelectExpr_CE7A5A7D_5A34E201<TIn, TResult>(
            this IQueryable<TIn> query, Func<TIn, object> selector)
        {
            var matchedQuery = query as object as IQueryable<global::Tutorial.Order>;
            var converted = matchedQuery.Select(o => new global::Tutorial.OrderDto
            {
                Id = o.Id,
                CustomerName = o.Customer != null ? (string?)o.Customer.Name : null,
                CustomerCountry = o.Customer != null && o.Customer.Address != null && o.Customer.Address.Country != null ? (string?)o.Customer.Address.Country.Name : null,
                CustomerCity = o.Customer != null && o.Customer.Address != null && o.Customer.Address.City != null ? (string?)o.Customer.Address.City.Name : null,
                CustomerInfo = new global::Tutorial.LinqraftGenerated_F1A64BF4.CustomerInfoDto
                {
                    Email = o.Customer != null ? (string?)o.Customer.EmailAddress : null,
                    Phone = o.Customer != null ? (string?)o.Customer.PhoneNumber : null
                },
                LatestOrderDate = o.OrderItems.Max(oi => oi.OrderDate),
                TotalAmount = o.OrderItems.Sum(oi => oi.Quantity * oi.UnitPrice),
                Items = o.OrderItems
                    .Select(oi => new global::Tutorial.LinqraftGenerated_DE33EA40.ItemsDto
                    {
                        ProductName = oi.Product != null ? (string?)oi.Product.Name : null,
                        Quantity = oi.Quantity
                    })
            });
            return converted as object as IQueryable<TResult>;
        }

    }
}
namespace Tutorial
{
    public partial class OrderDto
    {
        public required int Id { get; set; }
        public required string? CustomerName { get; set; }
        public required string? CustomerCountry { get; set; }
        public required string? CustomerCity { get; set; }
        public required global::Tutorial.LinqraftGenerated_F1A64BF4.CustomerInfoDto? CustomerInfo { get; set; }
        public required global::System.DateTime LatestOrderDate { get; set; }
        public required decimal TotalAmount { get; set; }
        public required global::System.Collections.Generic.IEnumerable<Tutorial.LinqraftGenerated_DE33EA40.ItemsDto> Items { get; set; }
    }
}
namespace Tutorial.LinqraftGenerated_DE33EA40
{
    [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
    [Linqraft.LinqraftAutoGeneratedDtoAttribute]
    public partial class ItemsDto
    {
        public required string? ProductName { get; set; }
        public required int Quantity { get; set; }
    }
}
namespace Tutorial.LinqraftGenerated_F1A64BF4
{
    [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
    [Linqraft.LinqraftAutoGeneratedDtoAttribute]
    public partial class CustomerInfoDto
    {
        public required string? Email { get; set; }
        public required string? Phone { get; set; }
    }
}

See the GitHub Repository for more details.