/// <summary>
/// Allows to execute a given <paramref name="func"/> within an ensured <paramref name="ctx"/> including
/// disposing the <paramref name="ctx"/> if none was given.
/// </summary>
/// <typeparam name="TResult">The result type of the <paramref name="func"/>.</typeparam>
/// <typeparam name="TContext">The type of DbContext which should be used.</typeparam>
/// <param name="func">The function to execute including an EF context.</param>
/// <param name="ctx">The context or <c>null</c> if a new should be created.</param>
/// <param name="resolver">A type which knows how to get the correct DbContext for a given entity type.</param>
/// <param name="logger">The logger to use inside the operation.</param>
/// <returns>The result of the <paramref name="func"/>.</returns>
public static TResult ExecuteContextWrapped <TContext, TResult>(Func <TContext, TResult> func, TContext ctx, IContextResolver resolver, ILogger logger = null) where TContext : DbContext
{
if (func == null)
{
var ex = new ArgumentNullException(nameof(func));
logger?.LogException("ECU-EX-02", ex);
throw ex;
}
var dispose = false;
if (ctx == null)
{
ctx = resolver.GetContext(typeof(TContext)) as TContext;
if (ctx == null)
{
throw new InvalidOperationException("Can not resolve database context.");
}
dispose = true;
}
var result = func.Invoke(ctx);
if (dispose)
{
ctx.Dispose();
}
return(result);
}
/// <summary>
/// Allows to execute a given <paramref name="action"/> within an ensured <paramref name="ctx"/> including
/// disposing the <paramref name="ctx"/> if none was given.
/// </summary>
/// <param name="action">The action to execute including an EF context.</param>
/// <param name="ctx">The context or <c>null</c> if a new should be created.</param>
/// <param name="resolver">A type which knows how to get the correct DbContext for a given entity type.</param>
/// <param name="logger">The logger to use inside the operation.</param>
public static void ExecuteContextWrapped <TContext>(Action <TContext> action, TContext ctx, IContextResolver resolver, ILogger logger = null) where TContext : DbContext
{
if (action == null)
{
var ex = new ArgumentNullException(nameof(action));
logger?.LogException("ECU-EX-01", ex);
throw ex;
}
var dispose = false;
if (ctx == null)
{
ctx = resolver.GetContext(typeof(TContext)) as TContext;
if (ctx == null)
{
throw new InvalidOperationException("Can not resolve database context.");
}
dispose = true;
}
action.Invoke(ctx);
if (dispose)
{
ctx.Dispose();
}
}
