需要先在服务器里面安装URL重写

然后在web.config文件添加以下代码：

 <rewrite>

     <rules>

        <rule name="HTTP to HTTPS redirect" stopProcessing="true">

          <match url="(.*)" />

          <conditions>

            <add input="{HTTPS}" pattern="off" ignoreCase="true" />

          </conditions>

          <action type="Redirect" redirectType="Permanent" url="https://{HTTP_HOST}/{R:1}" />

        </rule>

      </rules>

    </rewrite>