C＃Lambda语法

Question

I have used lambda syntax before but I keep seeing the following kind of syntax, not sure how to interpret this, is there are more conventional way of writing these so I can compare the two and understand better.

This is one of the examples I have seen:

       client.ExecuteAsync(request, (response, asyncHandle) =>
        {
            Assert.NotNull(response.Content);
            Assert.Equal(val, response.Content);
            resetEvent.Set();
        });

This is another example:

        client.SearchAsync("Getting", s =>
                    {
                     Assert.IsNotNull(s);
                     Assert.AreEqual(1, s.Count);
                    }, 
                    Assert.IsNull);

Is there a way of writing these without lambda so I can understand them?

Thanks

Answer 1

In this example, Lambdas are like methods. This is a roughly equivalent code:

private SomeMethod(List<string> s)
{
    Assert.IsNotNull(s);
    Assert.AreEqual(1, s.Count);
}

clientSearchAsync("Getting", SomeMethod, Assert.IsNull);

In a nutshell, you're passing SomeMethod to SearchAsync method as a parameter, and SearhAsync invokes it in its body.