LINQ: How to declare IEnumerable[AnonymousType]?

Question

This is my function:

    private IEnumerable SeachItem(int[] ItemIds)
    {
        using (var reader = File.OpenText(Application.StartupPath + @\"         


        

Answer 1

Return a ValueTuple instead of an anonymous class. Ex (using "named tuples")-

(Text: line, ItemId: id, Path: m.Groups[2].Value)

https://docs.microsoft.com/en-us/dotnet/csharp/tuples

Instead of-

new { Text = line, ItemId = id, Path = m.Groups[2].Value }

The ValueTuple is part of C# version 7 and was originally implemented as a separate NuGet package (System.ValueTuple). Starting with .NET 4.7 it is a built-in type. For .NET Core, versions prior to 2.0 required the NuGet package but it is built-in with version 2.0.