为你的桌面应用提供试用和许可证密钥。

// dotnet add package SunLicense
using SunLicense;

using var sl = new SunLicenseClient("https://api.sunlicense.com",
    token: AppConfig.ApiKey);              // slk_..., can only validate

try
{
    var r = await sl.ValidateAsync(settings.LicenseKey,   // AX8P-XXXX-XXXX-XXXX
        new Dictionary<string, string> { ["host"] = DeviceId.Get() });
    if (r.IsValid) return Activation.Ok;
    return Activation.Refused(r.Body);     // EXPIRED, TOO_MANY_MACHINES...
}
catch (SunLicenseException)
{
    return Activation.FromOfflineFile("license.lic");  // signed, checked locally
}