如果我必须每次都等待而不是使用Sync .ToList（），使用.ToListAsync的各个多数据库查询是否有任何性能优势？

Question

So I was first retrieving data from a database in this manner respectively with each entity repo:

_dbset.ShareCompany.ToList();

_dbset.SourceOfIncome.ToList();

Likewise there were more db calls. Then I changed my db call to:

await _dbset.ShareCompany.ToListAsync();

await _dbset.SourceOfIncome.ToListAsync();

But I do not think that there is any performance benefit with this async call as it has to wait for the data to be retreived, which actually in turn makes it into sync call. If I have to wait for the data in order to retrieve my next data.

So if anyone could tell me when is it a good practice to use async calls and will there be any performance benefit if I use async in my second code and how?

Answer 1

Using async will release your worker thread for accepting new requests. This makes your application more responsive. If you do not use async, the worker thread is blocked and IIS will spin-up a new thread for new requests (which eventually may hamper performance of application as you can spin up only so many threads).

This is actually duplicate of this question which has already been answered.