.net 将数据（Webclient/Webrequest）发布到HTTPS页面

我试图重建以下非常简单的Post方法：

https:/XYZ.com/v01/example.html

在Winforms客户端，它的工作原理如下：

WC = New Net.WebClient
Dim reqparm As New Specialized.NameValueCollection
reqparm.Add("DomainName", "XYZarco.com")
reqparm.Add("PIN", "1111")
Dim responsebytes() As Byte = WC.UploadValues(uri, "POST", reqparm) 'works
Dim responsebody As String = (New Text.UTF8Encoding).GetString(responsebytes) 'works

但在WindowsPhone7.1上它不起作用，因为库不支持上传值。经过研究，我发现：

Dim U As String = "https://XYZ.com/v01/api.asp"
        Dim uri As New Uri(U, UriKind.Absolute)

        If WC Is Nothing Then
            WC = New WebClient
            'WC.Headers("HttpRequestHeader.ContentType") = "    text/html"
            WC.Headers("HttpRequestHeader.ContentType") = "application/x-www-form-urlencoded"
            WC.Encoding = System.Text.Encoding.UTF8
        End If
        Dim Params As String = "DomainName=xyz.com&PIN=1111"
        WC.Headers("HttpRequestHeader.ContentLength") = Params.Length.ToString
        WC.UploadStringAsync(uri, "POST", Params)

但数据并未公布。响应方式：。错误01，域名不正确，请插入类似Domain.com的黄金网站

有人能帮我吗

WC.Headers("HttpRequestHeader.ContentType")

HttpRequestHeader是一个枚举。不加引号地使用它：

WC.Headers(HttpRequestHeader.ContentType)

---

非常感谢。我完全走错路了。你让我开心！