C# Mongo FirstOrDefaultAsync hangs

Question

using the 2.0 driver the following code will sometimes hang and never return.

public async Task GetFirst(FilterDefinition query)
{
    retu         


        

Answer 1

There are 2 solutions:

1. Add a ConfigureAwait(false) at the end:

   return await GetCollection.Find(query).FirstOrDefaultAsync().ConfigureAwait(false);
   

2. Just return the Task, since the result of FirstOrDefaultAsync() is the same type as the result you want to return.

   public Task GetFirst(FilterDefinition query)
   {
       return GetCollection.Find(query).FirstOrDefaultAsync();
   }