用F＃编写此AWS C＃代码段

Question

I'm new to F# and was just wondering how to write the below C# code in F#?

// Issue request and remember to dispose of the response
using (GetObjectResponse response = client.GetObject(request))
{
    using (StreamReader reader = new StreamReader(response.ResponseStream))
    {
        string contents = reader.ReadToEnd();
        Console.WriteLine("Object - " + response.Key);
        Console.WriteLine(" Version Id - " + response.VersionId);
        Console.WriteLine(" Contents - " + contents);
    }
}

I have read up on the documentation using use and came up with this:

    use response = s3Client.GetObject(req)
    (
      use reader = new StreamReader(response.ResponseStream)
      urlCheck = reader.ReadToEnd())
      Console.WriteLine(urlCheck)

but it's not working at all. Could anybody help?

EDIT
I used this link: f# keyword use and using as a template for my solution above but it didn't work.

The error I get is that "reader is not a function and cannot be applied".

Also, I know I could just leave it in C#, but I'd like to see if I can port it over to F#. Any advice on this would be much appreciated.

Answer 1

The use keyword in F# has slightly different mechanics than the C#'s using . One major difference is that in C# you explicitly specify the scope of the using with curly braces, but the F#'s use affects the whole "current block" ( let -binding or member), from the use to the end. So that you don't have to explicitly "nest" (ie indent) the code that is "under" the use . Just keep on writing as usual:

use response = s3Client.GetObject(req)
use reader = new StreamReader(response.ResponseStream)
let urlCheck = reader.ReadToEnd()
Console.WriteLine(urlCheck)