/// <summary>
/// 向指定的手机发送短信验证码。
/// </summary>
/// <param name="phoneNumber"></param>
/// <returns></returns>
public async Task <string> SendValidationCodeAsync(string phoneNumber)
{
using (var client = new ValidationCodeSvc.VerificationCodeClient())
{
var result = await client.SendAsync(phoneNumber);
if (result.StatusCode != 0)
{
throw new InvalidOperationException("发送验证码时出现无效操作，代码" + result.StatusCode + "，消息：" + result.Message);
}
return(result.VerificationCode);
}
}