public static async Task Initialize(ExpenseDbContext context, ILogger logger)
{
using (context)
{
logger?.LogInformation("{0} has been invoked", nameof(DbInitializer));
try
{
context.Database.EnsureCreated();//if db is not exist ,it will create database .but ,do nothing .
}
catch (Exception ex)
{
logger?.LogCritical("{0}:error {1} ", nameof(DbInitializer), ex.Message);
throw;
}
logger?.LogInformation("{0} has been invoked", nameof(DbInitializer));
// Look for any students.
if (!context.Set <Provider>().Any())
{
await SeedProvider.Initialize(context, logger);
}
if (!context.Set <Farm>().Any())
{
await SeedFarm.Initialize(context, logger);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="CryptoRandom" /> class.
/// </summary>
/// <param name="rng">The random data provider.</param>
/// <param name="provider">The provider for the additional seed data.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="rng" /> and/or <paramref name="provider" /> are <see langword="null" />.
/// </exception>
public CryptoRandom(RNGCryptoServiceProvider rng, SeedProvider provider)
: base()
{
if (rng == null)
{
throw new ArgumentNullException("rng");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
this._RNG = rng;
this._PROVIDER = provider;
}
public void GetBytes_Throws_InvalidOperation_Exception_If_All_Attempts_Unsuccessful()
{
var mockExtractorOne = new Mock <IEntropyExtractor>();
var mockExtractorTwo = new Mock <IEntropyExtractor>();
mockExtractorOne.Setup(x => x.GetEntropicData()).Throws(new Exception());
mockExtractorTwo.Setup(x => x.GetEntropicData()).Throws(new Exception());
var extractors = new List <IEntropyExtractor>
{
mockExtractorOne.Object,
mockExtractorTwo.Object,
};
var provider = new SeedProvider(extractors);
Assert.Throws <InvalidOperationException>(() => provider.GetBytes());
}
/// <summary>
/// Initializes a new instance of the <see cref="CryptoRandom" /> class.
/// </summary>
/// <param name="provider">The provider for the additional seed data.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="provider" /> is <see langword="null" />.
/// </exception>
public CryptoRandom(SeedProvider provider)
: this(new RNGCryptoServiceProvider(), provider)
{
}
