WPF 呼叫 WEB API 取得回傳的資料

Imports System.Net.Http
Imports System.Net.Http.Headers

Class MainWindow
    Dim client As HttpClient = New HttpClient

    Private Sub MainWindow_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
        client.BaseAddress = New Uri("http://localhost:60014")
        client.DefaultRequestHeaders.Accept.Add(
            New MediaTypeWithQualityHeaderValue("application/json"))

    End Sub

    Private Async Sub btn1_Click(sender As Object, e As RoutedEventArgs)
        Dim response = Await client.GetAsync("api/JB")
        response.EnsureSuccessStatusCode()
        Dim result As String = Await response.Content.ReadAsStringAsync()
        txt1.Text = result
    End Sub

End Class