How can the WebClient automatically add folders?

问题

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

If I want to save the test.txt file to the folder, the WebClient saves the file only, when I have created these folders (Files\Test\Folder) before. I have however for example the folder Test not created, the Webclient saves nothing.

How do I do that folders are added automatically?

回答1:

You would need to check first if the required folder does not exists already, then create it and after that start downloading of the file:

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);

more better is to create a method:

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

and call it :

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

来源：https://stackoverflow.com/questions/42951397/how-can-the-webclient-automatically-add-folders