C# Substring 返回错误值

Question

var newEncodedFiles = @"C:\Users\wande\OneDrive\Documentos\Visual Studio 2019\Spira\Spira\bin\Debug\netcoreapp5.0\Translated\master\new_uspc\menu\macrodic.dcp";
var newPath = newEncodedFiles.Substring(0, dcpFile.LastIndexOf('.'));

This code returns:

C:\Users\wande\OneDrive\Documentos\Visual Studio 2019\Spira\Spira\bin\Debug\netcoreapp5.0\Translated\master\new_uspc\menu\macro

I am trying to remove file extension to get:

C:\Users\wande\OneDrive\Documentos\Visual Studio 2019\Spira\Spira\bin\Debug\netcoreapp5.0\Translated\master\new_uspc\menu\macrodic

Answer 1

Its working as expected for me in .net core 3.1 console application.

var newEncodedFiles = @"C:\Users\wande\OneDrive\Documentos\Visual Studio 2019\Spira\Spira\bin\Debug\netcoreapp5.0\Translated\master\new_uspc\menu\macrodic.dcp";
var newPath = newEncodedFiles.Substring(0, newEncodedFiles.LastIndexOf('.'));

You need to use newEncodedFiles , not dcpFile .

Answer 2

var newEncodedFiles = @"C:\Users\wande\OneDrive\Documentos\Visual Studio 2019\Spira\Spira\bin\Debug\netcoreapp5.0\Translated\master\new_uspc\menu\macrodic.dcp";

var newPath = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(newEncodedFiles ), System.IO.Path.GetFileNameWithoutExtension(newEncodedFiles ));