C# সফটওয়্যার লাইসেন্সিং: .NET ও WinForms

dotnet add package Licentivo.SDK --version 0.11.6

dotnet new console --name LicensedApp --framework net8.0
cd LicensedApp
dotnet add package Licentivo.SDK --version 0.11.6

using Licentivo;

// BEGIN LICENTIVO PRODUCT
// Copy Product ID and all key ID/public key pairs from Console > Products > Signing public keys.
const string ProductId = "YOUR_PRODUCT_ID";
var TrustedKeys = new Dictionary<string,string> { ["YOUR_KEY_ID"] = "YOUR_PUBLIC_KEY" };
// END LICENTIVO PRODUCT

static string Setting(string name, string fallback) => Environment.GetEnvironmentVariable(name) ?? fallback;

// Call at the business entry point, including shortcuts and alternate menu actions.
static async Task ExportReport(string path)
{
    // Replace this write with your existing, non-metered export operation.
    await File.WriteAllTextAsync(path, "A report generated by the licensed application.\n");
}

try
{
    // In a GUI, read the activation input. Later starts pass an empty key.
    await using var client = await LicentivoClient.OpenProduct(
        ProductId, TrustedKeys, Setting("LICENTIVO_LICENSE_KEY", ""),
        error => Console.Error.WriteLine($"Background verification: {error.Message}"));
    var feature = Setting("LICENTIVO_FEATURE", "export");
    var path = Setting("LICENTIVO_OUTPUT", "licensed-report.txt");
    if (Setting("LICENTIVO_METERED", "") == "1")
        await client.RunMeteredFeature(feature, 1, Setting("LICENTIVO_OPERATION_ID", ""), () => ExportReport(path));
    else
        await client.RunFeature(feature, () => ExportReport(path));
    Console.WriteLine($"License OK: {feature} is available\nExport completed: {path}");
    // Keep client alive in your real app; disposal belongs in app shutdown.
}
catch (Exception error)
{
    Console.Error.WriteLine(error.Message);
    Environment.ExitCode = 2;
}

$env:LICENTIVO_LICENSE_KEY = 'YOUR_TEST_LICENSE_KEY'
dotnet run
# On later starts, restore the saved device credential:
Remove-Item Env:LICENTIVO_LICENSE_KEY
dotnet run

export LICENTIVO_LICENSE_KEY='YOUR_TEST_LICENSE_KEY'
dotnet run
# On later starts, restore the saved device credential:
unset LICENTIVO_LICENSE_KEY
dotnet run

dotnet new winforms --name LicensedWinForms --framework net8.0
cd LicensedWinForms
dotnet add package Licentivo.SDK --version 0.11.6

using Licentivo;
namespace LicensedWinForms;
sealed class DemoForm : Form {
    // BEGIN LICENTIVO PRODUCT
    // Console > Products > Signing public keys: paste Product ID and every key ID/public key pair.
    const string ProductId = "YOUR_PRODUCT_ID";
    static readonly Dictionary<string,string> TrustedKeys = new() { ["YOUR_KEY_ID"] = "YOUR_PUBLIC_KEY" };
    // END LICENTIVO PRODUCT
    readonly TextBox key = new() { Width = 380, UseSystemPasswordChar = true };
    readonly Label status = new() { AutoSize = true, MaximumSize = new Size(550, 0), Text = "Enter a key, or leave empty to restore this device." };
    readonly CancellationTokenSource lifetime = new();
    LicentivoClient? client;
    bool busy;
    [STAThread] static void Main() { ApplicationConfiguration.Initialize(); Application.Run(new DemoForm()); }
    DemoForm() {
        Text = "Licentivo · Report export"; ClientSize = new Size(600, 220);
        var panel = new FlowLayoutPanel { Dock = DockStyle.Fill, Padding = new Padding(20), FlowDirection = FlowDirection.TopDown, WrapContents = false, AutoScroll = true };
        Controls.Add(panel); panel.Controls.Add(new Label { Text = "Customer license key", AutoSize = true }); panel.Controls.Add(key);
        Add(panel, "Activate / restore", async () => {
            if (client is not null) { await client.DisposeAsync(); client = null; }
            client = await LicentivoClient.OpenProduct(ProductId, TrustedKeys, key.Text, ct: lifetime.Token);
            key.Clear(); status.Text = client.Status().State;
        });
        var buttons = new FlowLayoutPanel { AutoSize = true, AutoSizeMode = AutoSizeMode.GrowAndShrink, WrapContents = false }; panel.Controls.Add(buttons);
        Add(buttons, "Export CSV", () => Export("export", "report.csv"));
        Add(buttons, "Pro export", () => Export("pro", "pro-report.csv"));
        Add(buttons, "Refresh license", async () => { await Require().RefreshOnline(lifetime.Token); status.Text = Require().Status().State; });
        panel.Controls.Add(status);
        FormClosed += async (_, _) => { lifetime.Cancel(); if (client is not null) await client.DisposeAsync(); };
    }
    LicentivoClient Require() => client ?? throw new InvalidOperationException("Activate the application first.");
    async Task Export(string feature, string filename) {
        using var save = new SaveFileDialog { FileName = filename, Filter = "CSV report|*.csv" };
        await Require().RunFeature(feature, async () => {
            if (save.ShowDialog(this) != DialogResult.OK) return;
            await File.WriteAllTextAsync(save.FileName, "Item,Quantity,Price\nNotebook,2,12.50\nPen,5,3.00\n");
            status.Text = "Saved: " + save.FileName;
        });
    }
    void Add(Control panel, string title, Func<Task> action) {
        var button = new Button { Text = title, AutoSize = true }; panel.Controls.Add(button);
        button.Click += async (_, _) => {
            if (busy) return; busy = true; status.Text = "Working…";
            try { await action(); } catch (Exception error) { if (!IsDisposed) status.Text = error.Message; }
            finally { busy = false; }
        };
    }
}

dotnet run