c#linq增加新的一条记录同时删除最后一条代码

Sure! Here's an example of how you can use LINQ in C# to add a new record to a collection and remove the last record:

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        List<string> records = new List<string>() { "Record1", "Record2", "Record3" };

        // Add a new record
        string newRecord = "Record4";
        records.Add(newRecord);

        // Remove the last record
        string lastRecord = records.Last();
        records.Remove(lastRecord);

        // Print the updated records
        foreach (var record in records)
        {
            Console.WriteLine(record);
        }
    }
}

In this example, we have a `List<string>` called `records` that initially contains three records. We use the `Add` method to add a new record ("Record4") to the list. Then, we use the `Last` method to retrieve the last record in the list, and the `Remove` method to remove it. Finally, we print the updated records using a foreach loop.

Note that this example assumes that you have already imported the necessary namespaces (`System` and `System.Collections.Generic`) and have a basic understanding of C# and LINQ.