移除档案的副档名

using System;
using System.IO;
public class Example
{
public static void Main()
{
string filepath= @"C:\1234\5678\abc.csv";
// 直接将副档名给null就会清空
string onlyFileNamePath = Path.ChangeExtension(filepath, null);
Console.WriteLine(filePathWithoutExt);
}
}