解决无法建立SSL / TLS安全通道(The request was aborted: Could not create SSL/TLS secure channel)的问题
这个问题主要是没配置好SSL版本
在谷歌浏览器中打开该链接，按下F12，打开开发者工具，切换到Security选项卡，就可以看到了。这一串说明：
The connection to this site is encrypted and authenticated using TLS 1.2, ECDHE_RSA with P-256, and AES_128_GCM.
就是 TLS1.2
各SSL版本与C#代码的对应：
| SSL/TLS版本 | 对应C#代码 |
|---|---|
| SSL 3 | ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; |
| TLS 1.0 | ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls; |
| TLS 1.1 | ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11; |
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