是否可以在Visual Studio 2017的直接窗口中使用数据上下文？

Question

I'm trying to debug C# Linq 2 SQL code, and i'm getting a "System.NotSupportedException" exception when using Last() on a table. Is it not possible to use this operator in the Immediate windows of Visual Studio 2017?

Answer 1

I just tried a quick test using LinqPad and can confirm that Linq to SQL does not have a translation for .Last() , instead it throws an exception with the message "The query operator 'Last' is not supported."

If you have a incremental type primary id such an integere or another field that's indexed and easy to order by, instead perhaps try doing a .OrderByDescending(x => x.id).First()