Linq.Extension.PredicateBuilder 1.0.0

Linq.Extension.PredicateBuilder

A library that build dynamic query predicate with filters in Linq.

Installation

Install Linq.Extension.PredicateBuilder with Nuget

  dotnet add package Linq.Extension.PredicateBuilder

Usage

internal class Program
{
    static void Main(string[] args)
    {
        var searchFilters = new List<SearchFilter> {
            new SearchFilter{PropertyName = "Name", Operation = OperatorComparer.BeginsWith, Value = "post" },
            new SearchFilter{PropertyName = "IsPublished", Operation = OperatorComparer.Equal, Value = true },
            new SearchFilter{PropertyName = "TotalViews", Operation = OperatorComparer.GreaterOrEqual, Value = 150 },
        };

        var predicate = PredicateBuilder.Compile<Post>(searchFilters);

        var filteredPostsResult = new Post().GetPosts().Where(predicate).ToList();
    }
}

public class Post
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public bool IsPublished { get; set; }
    public DateTime PublishedAt { get; set; }
    public int TotalViews { get; set; }
    public int TotalComments { get; set; }

    public List<Post> GetPosts()
    {
        var posts = new List<Post>
        {
                new Post {Id = 1, Name = "post1" , Description = "post1 description", IsPublished = true, PublishedAt = DateTime.Now, TotalViews = 50, TotalComments = 4},
                new Post {Id = 2, Name = "post2" , Description = "post2 description", IsPublished = false, PublishedAt = DateTime.Now.AddDays(-3), TotalViews = 10, TotalComments = 1},
                new Post {Id = 3, Name = "post3" , Description = "post3 description", IsPublished = true, PublishedAt = DateTime.Now.AddDays(-8), TotalViews = 120, TotalComments = 8},
                new Post {Id = 4, Name = "post4" , Description = "post4 description", IsPublished = true, PublishedAt = DateTime.Now.AddDays(-1), TotalViews = 40, TotalComments = 5},
                new Post {Id = 5, Name = "post5" , Description = "post5 description", IsPublished = true, PublishedAt = DateTime.Now, TotalViews = 0, TotalComments = 0},
                new Post {Id = 6, Name = "post6" , Description = "post6 description", IsPublished = true, PublishedAt = DateTime.Now.AddDays(-10), TotalViews = 150, TotalComments = 10},
                new Post {Id = 7, Name = "post7" , Description = "post7 description", IsPublished = false, PublishedAt = DateTime.Now, TotalViews = 0, TotalComments = 0},
                new Post {Id = 8, Name = "post8" , Description = "post8 description", IsPublished = true, PublishedAt = DateTime.Now.AddDays(-20), TotalViews = 250, TotalComments = 15},

        };
        return posts;
    }
}