C# 在C上使用内容类型应用程序Json发送Http请求#

我试图通过C#发送内容类型为application/json的HTTP Get请求。但我找不到如何创建此请求。 我的HTTP请求是这样的：

POST /messaging/registrations/(REGISTRATION_ID_FOR_DESTINATION_APP_INSTANCE)/messages HTTP/1.1
Host: api.amazon.com
Authorization: Bearer (MY_ACCESS_TOKEN)
Content-Type: application/json
X-Amzn-Type-Version: com.amazon.device.messaging.ADMMessage@1.0
Accept: application/json
X-Amzn-Accept-Type: com.amazon.device.messaging.ADMSendResult@1.0

{
    "data":{"key1":"value1","key2":"value2"},
    "consolidationKey":"Some Key",
    "expiresAfter":86400
}

请有人帮我。

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为所有人着想。

假设您有这样一个类来表示有效负载

class Payload
{
        public Dictionary<string, string> data { get; set; }
        public string consolidationKey { get; set;}
        public long expiresAfter { get; set; }
}

---

假设有这样一个类来表示有效负载

class Payload
{
        public Dictionary<string, string> data { get; set; }
        public string consolidationKey { get; set;}
        public long expiresAfter { get; set; }
}