如何确定C#/ .NET中是否存在文件？

using System.IO;

string filePath = "path/to/your/file.txt";

if (File.Exists(filePath))
{
    Console.WriteLine("文件存在");
}
else
{
    Console.WriteLine("文件不存在");
}

using System.IO;

string directoryPath = "path/to/your/directory";
string searchPattern = "file.txt";

string[] files = Directory.GetFiles(directoryPath, searchPattern);

if (files.Length > 0)
{
    Console.WriteLine("文件存在");
}
else
{
    Console.WriteLine("文件不存在");
}