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ジェネリックメソッドにして型制約します。
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[ジェネリック メソッド - C# プログラミング ガイド | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/csharp/programming-guide/generics/generic-methods)
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```cs
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using System;
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using System.Linq;
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using System.Collections.ObjectModel;
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namespace Questions362491
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{
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class Program
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{
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static void Main()
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{
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var tests = new ObservableCollection<Test>
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{
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new Test(),
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new Test(),
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new Test(),
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};
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tests.ExportToCSV();
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}
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}
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static class ExObservableCollection
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{
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public static void ExportToCSV<T>(this ObservableCollection<T> Entities) where T : IConvertCSV
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{
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var csv = string.Join("\r\n", Entities.Select(x => x.ToCSV()));
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Console.WriteLine(csv);
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}
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}
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interface IConvertCSV
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{
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string ToCSV();
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}
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sealed class Test : IConvertCSV
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{
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public string ToCSV() => "Test";
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}
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}
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```
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---
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`ObservableCollection`に限定する必要もなさそうですが。
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