Blog as notepad time. Just a little reminder for myself on how to return the result from BeginExecuteNonQuery as a Task<int>
public Task<int> Save(string value)
{
var taskCompletionSource = new TaskCompletionSource<int>();
var connection = new SqlConnection(connectionString);
connection.Open();
var command = new SqlCommand("uspSaveSomeValue", connection)
{
CommandType = CommandType.StoredProcedure
};
command.Parameters.AddWithValue("@myparam", value);
command.BeginExecuteNonQuery(asyncResult =>
{
var result = command.EndExecuteNonQuery(asyncResult);
command.Dispose();
connection.Dispose();
taskCompletionSource.SetResult(result);
}, null);
return taskCompletionSource.Task;
}
If you know a better way, please comment below.
Yes, yes, I know, but I’m not working on 4.5 yet :(
Update: Ken Egozi suggested using Task<int>.Factory.FromAsync. Of course! I’d been doing so much TaskCompletionSource manual task creation recently that I’d forgotten about this useful shortcut. Here’s a more succinct version using FromAsync:
public Task<int> Save(string value)
{
var connection = new SqlConnection(connectionString);
connection.Open();
var command = new SqlCommand("uspSaveSomeValue", connection)
{
CommandType = CommandType.StoredProcedure
};
command.Parameters.AddWithValue("@myparam", value);
return Task<int>.Factory.FromAsync(command.BeginExecuteNonQuery(), asyncResult =>
{
var result = command.EndExecuteNonQuery(asyncResult);
command.Dispose();
connection.Dispose();
return result;
});
}
