C# 获得指定路径扩展名 , 去除扩展名

        //指定扩展名的文件
        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            string path = txtFilePath.Text.Trim(); //路径
            string kzm = txtFilehouzhui.Text.Trim();//"*.txt" //扩展名

            List<string> list = new List<string>();
            DirectoryInfo folder = new DirectoryInfo(path); //对象初始化

            foreach (FileInfo file in folder.GetFiles(kzm))
            {
                // file.Name; //输出文件名+扩展名
                textBox1.Text += "  --    " + file.FullName + "\r\n"; //获取的全路径
                list.Add(file.FullName); //添加全路径
            }
        }

var filename = "";
//去掉扩展名
if (file.FileName.LastIndexOf(".") != -1)
{
filename = file.FileName.Substring(0, file.FileName.LastIndexOf("."));
}
else
{
//申请文件名称
filename = file.FileName;
}