Example

[pazicb]

Hello,
I would need a simple example

I have

List<Item> items = new List<Item>
{
    new Item { Id = 1, Name = "Apple", Price = 50 },
    new Item { Id = 2, Name = "Banana", Price = 120 },
    new Item { Id = 3, Name = "Cherry", Price = 80 },
    new Item { Id = 4, Name = "Date", Price = 200 }
};

and

Expression<Func<Item, bool>> query = item => item.Price > 100;

I would need to serialize this function using System.Text.Json.
Then deserialize it and apply it to items.

Thank you.

[6bee]

For your specific request:

// <PackageReference Include="Remote.Linq.Text.Json" Version="7.2.2" />

using Remote.Linq;
using Remote.Linq.Text.Json;
using System.Text.Json;

System.Linq.Expressions.Expression<Func<Item, bool>> query = item => item.Price > 100;

Remote.Linq.Expressions.LambdaExpression remoteExpression = query.ToRemoteLinqExpression();

JsonSerializerOptions jsonSerializerOptions = new JsonSerializerOptions().ConfigureRemoteLinq();

string json = JsonSerializer.Serialize(remoteExpression, jsonSerializerOptions);

Remote.Linq.Expressions.LambdaExpression deserializedRemoteExpression = JsonSerializer.Deserialize<Remote.Linq.Expressions.LambdaExpression>(json, jsonSerializerOptions);

System.Linq.Expressions.Expression<Func<Item, bool>> filterExpression = deserializedRemoteExpression.ToLinqExpression<Item, bool>();

List<Item> items = new List<Item>
{
    new Item { Id = 1, Name = "Apple", Price = 50 },
    new Item { Id = 2, Name = "Banana", Price = 120 },
    new Item { Id = 3, Name = "Cherry", Price = 80 },
    new Item { Id = 4, Name = "Date", Price = 200 }
};

List<Item> filteredList = items.AsQueryable().Where(filterExpression).ToList();

public record class Item
{
    public required int Id { get; init; }
    public required string Name { get; init; }
    public int? Price { get; init; }
}

More samples can be found in the samples folder and Remote.Linq.Samples.sln respectively.