使用JavaScriptSerializer反序列化JSON对象

Question

我正在为我的应用程序编写引导程序。 它会下载该应用程序的最新版本并进行安装。 我对应用程序的JSON解析部分有疑问。 我正在尝试从此JSON获取信息：

{
    "Launcher": {
        "latestver": "<the latest version of the launcher>",
        "url": "<url to the launcher pack>",
    }
}

为了解析它，我创建了一个结构：

Public Structure Launcher

    Public latestver As String
    Public url As String

End Structure

然后，我尝试从互联网上的JSON获取值：

    Dim client As New WebClient() With {.Proxy = Nothing}
    Dim Json As String = Await client.DownloadStringTaskAsync("<url to the launcher.json>")

    Dim jss As New JavaScriptSerializer()
    Dim thisLauncher As Launcher = jss.Deserialize(Of Launcher)(Json)

    RemoteLauncherVer = thisLauncher.latestver
    LauncherPackUrl = thisLauncher.url

但是，当我使用MsgBox检查值时，这些值是Nothing ：

    MsgBox(RemoteLauncherVer)
    MsgBox(LauncherPackUrl)

有人可以帮我找出原因吗？

Answer 1

您在根级别上缺少一个类。 尝试使您的班级像这样：

Public Class RootObject
    Public Property Launcher As Launcher
End Class

Public Class Launcher
    Public Property latestver As String
    Public Property url As String
End Class

然后像这样反序列化：

Dim jss As New JavaScriptSerializer()
Dim thisLauncher As Launcher = jss.Deserialize(Of RootObject)(json).Launcher