移除檔案的副檔名

using System;
using System.IO;
public class Example
{
public static void Main()
{
string filepath= @"C:\1234\5678\abc.csv";
// 直接將副檔名給null就會清空
string onlyFileNamePath = Path.ChangeExtension(filepath, null);
Console.WriteLine(filePathWithoutExt);
}
}