c# - WebClient如何自动添加文件夹？

Question

WebClient webClient = new WebClient();
webClient.DownloadFileAsync(new Uri(urlDownload), @"C:\Files\Test\Folder\test.txt");

如果我想将 test.txt 文件保存到该文件夹​​，WebClient 仅在我创建这些文件夹时保存该文件(Files\Test\Folder) 之前。 然而，例如，我没有创建文件夹 Test，Webclient 没有保存任何内容。

如何自动添加文件夹？

Answer 1

您需要首先检查所需的文件夹是否不存在，然后创建它，然后开始下载文件:

string path = "@C:\Files\Test\Folder";
string filePath = path +"\\test.txt";
if (!Directory.Exists(path))
{
   Directory.CreateDirectory(path);
}
WebClient webClient = new WebClient();
webClient.DownloadFileAsync(new Uri(urlDownload),filePath);

更好的是创建一个方法:

private void CreateFolder(string path)
{
    if (!Directory.Exists(path))
    {
         Directory.CreateDirectory(path);
    }
}

并称其为:

string path = "@C:\Files\Test\Folder";
string filePath = path +"\\test.txt";
CreateFolder(path);
WebClient webClient = new WebClient();
webClient.DownloadFileAsync(new Uri(urlDownload),filePath);