[UWP][c#] How to override tostring method for "StorageFileQueryResult" class ?

Question

is there a way to override tostring method for "StorageFileQueryResult" class ?

Answer 1

Hello,

Welcome to Microsoft Q&A.

If you want to get a string from a StorageFileQueryResult to show the information for logging, then you could create a method which accepts a parameter whose type is StorageFileQueryResult, and return the string you needed from the StorageFileQueryResult instance.

Or, if you want a better coupling, you could wrap a StorageFileQueryResult instance and a ToString() method in a single class.

Here is a presentation for the second idea:

public class MyStorageFileQueryResult  
{  
    public StorageFileQueryResult storageFileQueryResult { get; set; }  
    public async Task<string> ToString()  
    {  
        //If your ToString() method is synchronous, you could create ToString() like this:  
        //public override string ToString()  
        string returnString = "StorageFile list:\n";  
        IReadOnlyList<StorageFile> fileList = await storageFileQueryResult.GetFilesAsync();  

        foreach (StorageFile file in fileList)  
        {  
            returnString += file.Name + "\n";  
        }  

        return returnString;  
    }  
}  

//A test  
private async void Button_Click(object sender, RoutedEventArgs e)  
{  
    List<string> fileTypeFilter = new List<string>();  
    fileTypeFilter.Add(".jpg");  
    fileTypeFilter.Add(".png");  
    fileTypeFilter.Add(".bmp");  
    fileTypeFilter.Add(".gif");  
    var queryOptions = new QueryOptions(CommonFileQuery.OrderByName, fileTypeFilter);  

    // Create query and retrieve files  
    MyStorageFileQueryResult query = new MyStorageFileQueryResult();  
    query.storageFileQueryResult= KnownFolders.PicturesLibrary.CreateFileQueryWithOptions(queryOptions);  
    string str =await query.ToString();  
}  

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