在 .NET Standard / Core 中设置

```csharp
// Create a Viewer instance using the current API (no constructor arguments required).
var docViewer = new Viewer();
```

using System.IO;
using Microsoft.Extensions.DependencyInjection;
using Doconut;

var licenseFilePath = Path.Combine(builder.Environment.WebRootPath, "path/to/your/license");
var docViewer = app.Services.GetRequiredService<Viewer>();

using System.IO;
using Doconut.Infrastructure.Licensing;

using (var licenseStream = new FileStream("path/to/your/license", FileMode.Open, FileAccess.Read))
{
    var license = new DoconutLicense { DocBytes = new BinaryReader(licenseStream).ReadBytes((int)licenseStream.Length) };
}

using System.Xml;
using Doconut.Infrastructure.Licensing;

var xmlDoc = new XmlDocument(); // load the license XML
xmlDoc.Load("path/to/your/license.xml");
var license = new DoconutLicense(); // instantiate license object (populate properties as needed)

```csharp
// Prepare the paths to the viewer licence files (kept for reference; the current API loads them automatically)
var licenseFilePaths = new List<string>
{
    Path.Combine(_hostingEnvironment.WebRootPath, "Doconut.Viewer.lic"),
    Path.Combine(_hostingEnvironment.WebRootPath, "Doconut.Viewer.Annotation.lic"),
    Path.Combine(_hostingEnvironment.WebRootPath, "Doconut.Viewer.Search.lic")
};

// The Viewer class no longer requires the licences in its constructor.
// Create an instance with the default constructor.
var docViewer = new Viewer();

// Open a document (e.g., a PDF) and obtain a token that represents the opened file.
string token = await docViewer.OpenDocumentAsync(
    filePath: Path.Combine(_hostingEnvironment.WebRootPath, "sample.pdf"),
    options: new DocOptions(),
    ct: CancellationToken.None);
```

using (var pluginLicenseStream = new FileStream("path/to/your/plugin-license.lic", FileMode.Open))
{
    // In Doconut.NETStandard 26.9.0 the license is supplied via the configuration
    // passed to OpenDocumentAsync (BaseConfig), so the explicit SetLicensePlugin call
    // is no longer required. Keep the license file accessible to the viewer or
    // include it in your BaseConfig as shown in other samples.
}

// The license XML is discovered automatically by the viewer in Doconut.NETStandard 26.9.0.
// No explicit API call is required to register it.

string token = await Viewer.OpenDocumentAsync(
    "path/to/your/document.pdf",
    null, // DocOptions – use default settings
    CancellationToken.None);

using Doconut.Annotations;
using System.Drawing;

// Placeholder: open the document and obtain page dimensions using the current Doconut.NETStandard API.
// Placeholder: create an annotation manager for the page size.

string imgUrl = "img/sample.png";
var imgAnn = new ImageAnnotation(
    1,
    new Rectangle(600, 700, 750, 300),
    imgUrl
);

// Placeholder: add the annotation to the manager and load the annotation XML back into the viewer using the current API.

function ImageStamp() {
    if (null != objctlDoc.YourController()) {
        var objStampImage = new ImageAnnotation({ left: 200, top: 200, width: 260, height: 55 });
        objctlDoc.YourController().AddAnnotation(null, objStampImage, null);

        objStampImage.SetNote('/images/Approved_Stamp.png');
        objStampImage.Paint();
    }
}