FileNotFoundException错误创建数据库WP8 Sqlite

Question

I am following this tutorial to create an application with an SQLite database.

When I executed it, I got System.IO.FileNotFoundException pointing to the file SQLite.cs , the line where the error originated is shown in the screen shot below(in the SQLite.cs file)

Below is the code snippet for creating a database

string dbPath = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, "db.sqlite");
if (!FileExists(dbPath).Result)
{
   using (var db = new SQLiteConnection(dbPath))
   {
        db.CreateTable<Person>();
   }
}

and the method FileExists

        private async Task<bool> FileExists(string fileName)
        {
            var result = false;
            try
            {
                var store = await Windows.Storage.ApplicationData.Current.LocalFolder.GetFileAsync(fileName);
                result =true;
            }
            catch
            {
            }

            return result;

        }

I am wondering what went wrong. Any help?

Answer 1

With the line if (!FileExists(dbPath).Result) you're saying that if the file doesn't exist, connect to the database and create a table. So your condition is wrong, because the line

Windows.Storage.ApplicationData.Current.LocalFolder.GetFileAsync(fileName)

wants an existing file to execute correctly. Correct then your if condition with:

if (FileExists(dbPath).Result)