如果C＃中不存在，则自动创建文件夹

因此，我试图在特定路径下创建文件，但是我拥有的代码不允许我创建文件夹。

这是我的代码：

public void LogFiles()
{
    string data = string.Format("LogCarga-{0:yyyy-MM-dd_hh-mm-ss}.txt", DateTime.Now);
    for (int linhas = 0; linhas < dataGridView1.Rows.Count; linhas++)
    {
        if (dataGridView1.Rows[linhas].Cells[8].Value.ToString().Trim() != "M")
        {
            var pathWithEnv = @"%USERPROFILE%\AppData\Local\Cargas - Amostras\_logs\";
            var filePath = Environment.ExpandEnvironmentVariables(pathWithEnv);
            using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
            {
                using (StreamWriter writer = File.AppendText(filePath + data))
                {
                    string carga = dataGridView1.Rows[linhas].Cells[0].Value.ToString();
                    string referencia = dataGridView1.Rows[linhas].Cells[1].Value.ToString();
                    string quantidade = dataGridView1.Rows[linhas].Cells[2].Value.ToString();
                    string dataemissao = dataGridView1.Rows[linhas].Cells[3].Value.ToString();
                    string linha = dataGridView1.Rows[linhas].Cells[4].Value.ToString();
                    string marca = dataGridView1.Rows[linhas].Cells[5].Value.ToString().Trim();
                    string descricaoweb = dataGridView1.Rows[linhas].Cells[6].Value.ToString().Trim();
                    string codprod = dataGridView1.Rows[linhas].Cells[7].Value.ToString().Trim();
                    string tipoemb = dataGridView1.Rows[linhas].Cells[8].Value.ToString().Trim();
                    string nomepc = System.Environment.MachineName;
                    writer.WriteLine(carga + ", " + referencia + ", " + quantidade + ", " + dataemissao + ", " + linha + ", " + marca + ", " + descricaoweb + ", " + codprod + ", "
                            + tipoemb + ", " + nomepc);
                    }  
                }  
            }
        }
    }

这%USERPROFILE%\AppData\Local\在通用路径中，我想自动创建\Cargas - Amostras\_logs\。

你有什么想法吗？