Need help in solving error in HTTP GET request - vb.net

Question

Need help in solving error in HTTP GET request [closed]
I have the following code in VB.NET framework which should pull the data in json format and add it to a list view control using GET request. However I am getting following error:
System.Threading.Tasks.Task.FromResult(System.Net.Http.HttpResponseMessage)
Dim client = New HttpClient()
client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "{Subscription-Key}")
Dim uri = "https://example.com/" & SearchKey
Dim response = client.GetAsync(uri)
lstMer.Items.Add(response.ToString)
Initially I wrote the following code in VBA and it was working fine:
Dim jsonText as String
Set req = New MSXML2.ServerXMLHTTP60
key_id = "{Subscription-Key}"
key_header_name = "Subscription-Key-Id"
liveURL = "https://example.com/" & SearchKey
req.Open "GET", liveURL, False
req.setRequestHeader {Subscription-Key-Id}, {Subscription-Key}
req.setRequestHeader "Host", "site Address"
req.send
jsonText = req.responseText
The requirement is to get the headers from URL and fill a list view.

Answer 1

I think I understand. You don't get an error
System.Threading.Tasks.Task.FromResult(System.Net.Http.HttpResponseMessage)
rather you get that as a result of response.ToString(). This is because you are calling client.GetAsync(uri) directly, which returns a Task.FromResult<TResult>. However, it is meant to be run async, and there are some convenient keywords for achieving this, namely Async / Await. If you await the task, instead of returning a Task.FromResult<TResult>, it will return a TResult. So change your code to do just that
Private Async Sub Foo()
Dim client = New HttpClient()
client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "{Subscription-Key}")
Dim uri = "https://example.com/" & SearchKey
Dim response = Await client.GetAsync(uri)
lstMer.Items.Add(response.ToString)
End Sub
See HttpClient.GetAsync and about what it returns Task.FromResult