创建一个新文件夹，给定父文件夹的路径:

        string pathToNewFolder = System.IO.Path.Combine(parentFolderPath, "NewSubFolder");
        DirectoryInfo directory = Directory.CreateDirectory(pathToNewFolder); 
       // Will create if does not already exist (otherwise will ignore)

指定新文件夹的路径 目录信息变量，因此您可以继续操作它，如您所愿。

if (!Directory.Exists(Path.GetDirectoryName(fileName)))
{
    Directory.CreateDirectory(Path.GetDirectoryName(fileName));
}

如果路径还不存在，可以使用如下方法创建路径:

using System.IO;

private void CreateIfMissing(string path)
{
  bool folderExists = Directory.Exists(Server.MapPath(path));
  if (!folderExists)
    Directory.CreateDirectory(Server.MapPath(path));
}

你可以使用try/catch子句来检查它是否存在:

  try
  {
    if (!Directory.Exists(path))
    {
       // Try to create the directory.
       DirectoryInfo di = Directory.CreateDirectory(path);
    }
  }
  catch (IOException ioex)
  {
     Console.WriteLine(ioex.Message);
  }

创建一个新文件夹，给定父文件夹的路径:

        string pathToNewFolder = System.IO.Path.Combine(parentFolderPath, "NewSubFolder");
        DirectoryInfo directory = Directory.CreateDirectory(pathToNewFolder); 
       // Will create if does not already exist (otherwise will ignore)

指定新文件夹的路径 目录信息变量，因此您可以继续操作它，如您所愿。

从多个答案衍生/组合而来，对我来说，实现它就像这样简单:

public void Init()
{
    String platypusDir = @"C:\platypus";
    CreateDirectoryIfDoesNotExist(platypusDir);
}

private void CreateDirectoryIfDoesNotExist(string dirName)
{
    System.IO.Directory.CreateDirectory(dirName);
}