How to make LINQ execute a (SQL) LIKE range search

Question

I am in big need of help, i have been trying to do this for some time now.

So I have this Query:

Select name from BlaBlaBla

order by 

case when nam         


        

Answer 1

If I was you I wouldn't try using Expressions to solve this issue since it brings in a lot of complexity.

I see that you would like to have a generic method, so it can work with different domain entities, yet you are expecting that each entity has a Name property. You can solve this in a more simple way by defining interface that contains Name property. Like this:

    public static void Main()
    {
        var test = new List()
        {
            new YourDomainEntity() { Name = "1test", OtherProperty = "1"},
            new YourDomainEntity() { Name = "2test",  OtherProperty = "2" },
            new YourDomainEntity() { Name = "2test", OtherProperty = "1"   }
        };

        var k = Foo(test).ToList();
    }

    public interface INameOrderable
    {
        string Name { get; set; }
    }

    public interface IOtherPropertyOrderable
    {
        string OtherProperty { get; set; }
    }

    public static IEnumerable Foo(IEnumerable list) where T : INameOrderable, IOtherPropertyOrderable
    {
        return list.OrderBy(a => a.Name, new NamesDescComparer()).ThenBy(b => b.OtherProperty);
    }

    public class NamesDescComparer : IComparer
    {
        public int Compare(string x, string y) => -String.CompareOrdinal(x, y);
    }

    class YourDomainEntity : INameOrderable, IOtherPropertyOrderable
    {
        public string OtherProperty { get; set; }
        public string Name { get; set; }
    }

I believe the method Foo is what you are looking for.

Note the where T : INameOrderable part. It restricts usage of this method to entities that implement INameOrderable interface