CODEWITHSUNDEEP
c#uwp
nam
nam

Reputation: 23749

C#-UWP: How to find if a subfolder exists in a StorageFolder?

Question: Without using a foreach loop how we can find out if a StorageFolder has any SubFolder. Probably a C# guru can help here.

Why asked: I am using StorageFolder.GetFoldersAsync() method that returns IAsyncOperation<IReadOnlyList<StorageFolder>> and does seem to have IReadOnlyCollection.Count property but I could figure out how to use this property in my following line of code. I do need that count and do not want to use foreeach loop to get that count - unless there is not better work around:

......
IAsyncOperation<IReadOnlyList<StorageFolder>> MyList = MyStorageFolder.GetFoldersAsync();
......

So, how do I apply count property to MyList

Upvotes: 0

Views: 241

Answers (1)

Xie Steven
Xie Steven

Reputation: 8591

how do I apply count property to MyList

So, you did not know how to call an asynchronous method. Please see The Task asynchronous programming model in C# and Asynchronous programming in the UWP for details.

For your question, you just need to change your code like the following:

private async void YourMethod()
{
    ......
    IReadOnlyList<StorageFolder> MyList = await MyStorageFolder.GetFoldersAsync();
    if (MyList.Count > 0)
    {
        Debug.WriteLine("SubFolder exists.");
    }
}

Upvotes: 1

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