ARTICLE

Search Files to Local Library in Windows Store Apps

Posted by Gaurav Gupta Articles | Windows Store Apps November 01, 2012
In this article I will show you how to search files in a local computer's locations such as folder, library or any other location in the computer in Windows Store Apps using the Windows.Storage.Search API.
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In this article I will show you how to search files in a local computer's locations such as folder, library or any other location in the computer. To access the files and folders I use the Windows.Storage.Search API.

Using the Windows.Storage.Search.API we can access the files and folders and even get files based on some query options. We can create our own query to search the files and folders in the system libraries.

Here I show an example of searching files in the Music Libraries based on some query criteria and also display a status message indicating whether the file is found or not.

How to search files programmatically in Windows Store Apps.

Step 1

Create a Blank application of Windows Store Apps.

Step 2

Include some namespaces to use the APIs; they are:

using Windows.Storage;

using Windows.Storage.Search;

Step 3

Get the MusicLibrary in the storage folder as in the following:

StorageFolder musicFolder = KnownFolders.MusicLibrary;

Step 4

Here I use the QueryOptions class to make a query to search the folder. Use the user's input to make a query. See:

QueryOptions queryOptions = new QueryOptions(CommonFileQuery.OrderBySearchRank, fileTypeFilter);

            //use the user's input to make a query

queryOptions.UserSearchFilter = InputTextBox.Text;

StorageFileQueryResult queryResult = musicFolder.CreateFileQueryWithOptions(queryOptions);

Step 5

Get the result into an IReadOnlyList, as in:

IReadOnlyList<StorageFile> files = await queryResult.GetFilesAsync();

Step 6

Now, we only need to traverse the List and check the count of list objects to determine whether file is found or not. See:

     if (files.Count == 0)

     {

         outputText.Append("No files found for '" + queryOptions.UserSearchFilter + "'");

     }

     else if (files.Count == 1)

     {

         outputText.Append(files.Count + " file found:\n\n");

     }

     else

     {

         outputText.Append(files.Count + " files found:\n\n");

     }

 

          //output the name of each file that matches the query

     foreach (StorageFile file in files)

     {

         outputText.Append(file.Name + "\n");

     }

 

     OutputTextBlock.Text = outputText.ToString();

Here is full code

private async void SearchButton_Click(object sender, RoutedEventArgs e)

{

     StorageFolder musicFolder = KnownFolders.MusicLibrary;

    List<string> fileTypeFilter = new List<string>();

    fileTypeFilter.Add("*");

 

    QueryOptions queryOptions = new QueryOptions(CommonFileQuery.OrderBySearchRank, fileTypeFilter);

    //use the user's input to make a query

    queryOptions.UserSearchFilter = InputTextBox.Text;

     StorageFileQueryResult queryResult = musicFolder.CreateFileQueryWithOptions(queryOptions);
     
StringBuilder outputText = new StringBuilder();

            //find all files that match the query

     IReadOnlyList<StorageFile> files = await queryResult.GetFilesAsync();

            //output how many files that match the query were found

     if (files.Count == 0)

     {

         outputText.Append("No files found for '" + queryOptions.UserSearchFilter + "'");

     }

     else if (files.Count == 1)

     {

         outputText.Append(files.Count + " file found:\n\n");

     }

     else

     {

         outputText.Append(files.Count + " files found:\n\n");

     }

 

          //output the name of each file that matches the query

     foreach (StorageFile file in files)

     {

         outputText.Append(file.Name + "\n");

     }

 

     OutputTextBlock.Text = outputText.ToString();

}

Step 7

Output

Enter the keyword for a filename into the textox, as in:

Search-file-in-Windows-Store-Apps.jpg

Now you will see the number and names of files found, as in:

Search-file-in-local-library.jpg

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