SharePoint online (O365):How to get a parent item URL? - sharepoint

Question

Having the following URL
https://test.sharepoint.com/shared%20documents/MyFolder1/myImg1.jpeg
I need to send a request for parent URL of this item (in this specific case image) and to get a response:
https://test.sharepoint.com/shared%20documents/MyFolder1/
Does such a request exists if using a CSOM or Office 365 Activity API?
Where in documentation can i find such examples?

Answer 1

static public string ReturnFileParentUrl(string url)
{
try
{
Uri uri = new Uri("https://XXX.sharepoint.com/");
using (var ctx = GetContext(uri, "YYY#DOMAIN.com", "password"))
{
Microsoft.SharePoint.Client.File item = ctx.Web.GetFileByServerRelativeUrl(url);
ctx.Load(item);
ctx.ExecuteQuery();
Console.WriteLine("file: {0}\n", item.Name);
Console.WriteLine("Type: {0}\n", item.TypedObject.ToString());
if (item.TypedObject.ToString() == "Microsoft.SharePoint.Client.File") //To check if there is a better way to check if the item is a file
if (item.ServerObjectIsNull != true)
{
ctx.Load(item, i => i.ListItemAllFields);
ctx.ExecuteQuery();
var folder = ctx.Web.GetFolderByServerRelativeUrl((string)item.ListItemAllFields["FileDirRef"]);
ctx.Load(folder);
ctx.ExecuteQuery();
Console.WriteLine("parent relative url {0}\n", folder.ServerRelativeUrl);
return folder.ServerRelativeUrl;
}
return null;
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
return null;
}