使用Asp.Net进行GCM推送通知

Question

您可能已经看到,Google正在迁移其推送通知系统.

http://developer.android.com/guide/google/gcm/c2dm.html

是否有任何示例或指南可用于使用Asp.Net应用程序实施Google Cloud Messaging(GCM)？

Answer 1

我有一段代码对我来说很好,可能会有所帮助,我测试了它...

void send(string regId)
{
    var applicationID = "xxxxxxxx";


    var SENDER_ID = "xxxxx";
    var value = txtMsg.Text;
    WebRequest tRequest;
    tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send");
    tRequest.Method = "post";
    tRequest.ContentType = " application/x-www-form-urlencoded;charset=UTF-8";
    tRequest.Headers.Add(string.Format("Authorization: key={0}", applicationID));

    tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));

    // string postData = "{ 'registration_id': [ '" + regId + "' ], 'data': {'message': '" + txtMsg.Text + "'}}";
    string postData = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + regId + "";
    Console.WriteLine(postData);
    Byte[] byteArray = Encoding.UTF8.GetBytes(postData);
    tRequest.ContentLength = byteArray.Length;

    Stream dataStream = tRequest.GetRequestStream();
    dataStream.Write(byteArray, 0, byteArray.Length);
    dataStream.Close();

    WebResponse tResponse = tRequest.GetResponse();

    dataStream = tResponse.GetResponseStream();

    StreamReader tReader = new StreamReader(dataStream);

    String sResponseFromServer = tReader.ReadToEnd();

    lblStat.Text = sResponseFromServer;
    tReader.Close();
    dataStream.Close();
    tResponse.Close();
}

Answer 2

这是c#中的代码

 WebRequest tRequest;
        tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send");
        tRequest.Method = "post";
        tRequest.ContentType = "application/x-www-form-urlencoded";
        tRequest.Headers.Add(string.Format("Authorization: key={0}", GoogleAppID));
String collaspeKey = Guid.NewGuid().ToString("n");
String postData=string.Format("registration_id={0}&data.payload={1}&collapse_key={2}", DeviceID, "Pickup Message" + DateTime.Now.ToString(), collaspeKey);
Byte[] byteArray = Encoding.UTF8.GetBytes(postData);
tRequest.ContentLength = byteArray.Length;

Stream dataStream = tRequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();

WebResponse tResponse = tRequest.GetResponse();

dataStream = tResponse.GetResponseStream();

StreamReader tReader = new StreamReader(dataStream);

String sResponseFromServer = tReader.ReadToEnd();

tReader.Close();
dataStream.Close();
tResponse.Close();

Answer 3

不久前，我一直在尝试使用 C2DM 来发送推送通知。我根据本页提到的更改更改了代码：http://developer.android.com/guide/google/gcm/c2dm.html#server以使用 GCM 服务：

Private Sub btnPush_Click(sender As Object, e As System.EventArgs) Handles btnPush.Click
    lblResponse.Text = SendNotification(AIzaSyB-1uEai2WiUapxCs2Q0GZYzPu7Udno5aA)
End Sub

我的发送通知功能：

Private Function SendNotification(ByVal authstring As String) As String
    ServicePointManager.ServerCertificateValidationCallback = Function(sender As Object, certificate As X509Certificate, chain As X509Chain, sslPolicyErrors As SslPolicyErrors) True
    Dim request As WebRequest = WebRequest.Create("https://android.googleapis.com/gcm/send")
    request.Method = "POST"
    request.ContentType = "application/x-www-form-urlencoded"
    request.Headers.Add(String.Format("Authorization: key={0}", authstring))
    Dim collaspeKey As String = Guid.NewGuid().ToString("n")
    Dim postData As String = String.Format("registration_id={0}&data.payload={1}&collapse_key={2}", deviceList.SelectedValue, txtPayload.Text, collaspeKey)
    Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
    request.ContentLength = byteArray.Length
    Dim dataStream As Stream = request.GetRequestStream()
    dataStream.Write(byteArray, 0, byteArray.Length)
    dataStream.Close()
    Dim response As WebResponse = request.GetResponse()
    dataStream = response.GetResponseStream()
    Dim reader As New StreamReader(dataStream)
    Dim responseFromServer As String = reader.ReadToEnd()
    reader.Close()
    dataStream.Close()
    response.Close()

    Return responseFromServer
End Function

看来 GCM 并不要求您通过 Google 进行身份验证来获取身份验证密钥（就像 C2DM 的情况一样）。相反，您需要一个传递给 SendNotification 函数的 API 密钥。此页面应该可以帮助您设置 API 密钥：http://developer.android.com/guide/google/gcm/gs.html

我的网络表单的代码如下，以防万一：

<form id="form1" runat="server">
<div>
    <asp:DropDownList ID="deviceList" runat="server">
        <asp:ListItem Value="device-id-goes-here">Eclipse AVD</asp:ListItem>
        <asp:ListItem Value="device-id-goes-here">My Phone 1</asp:ListItem>
        <asp:ListItem Value="device-id-goes-here">My Phone 2</asp:ListItem>
    </asp:DropDownList>
    <br /><br />
    <asp:TextBox ID="txtPayload" runat="server" Width="480px"></asp:TextBox>
    <br /><br />
    <asp:Button ID="btnPush" runat="server" Text="Push" />
    <asp:Label ID="lblResponse" runat="server" Text=""></asp:Label>
</div>
</form>

至于创建 Android 应用程序以接收推送通知，请查看此链接：http://developer.android.com/guide/google/gcm/gs.html#android-app

不要忘记导入 System.Net、System.IO、System.Security.Cryptography.X509Certificates 和 System.Net.Security。