クイックスタート

builder.Services.AddDoconut(options =>
{
    options.LicensePath = "Doconut.Viewer.lic";
});
builder.Services.AddDistributedMemoryCache(); // セッション状態にはキャッシュが必要です（MVC/Razor Pages はすでに追加されています）
builder.Services.AddSession(); // Doconut のドキュメント セキュリティは ASP.NET のセッション状態に依存します

app.UseSession();          // UseDoconut() の前に UseSession() を呼び出します
app.UseDoconutResources(); // UseDoconut() の前に登録する必要があります
app.UseDoconut();

builder.Services.AddDoconut(options =>
{
    options.UnsafeMode      = false;   // Doconut のセッションチェックを有効に保ちます
    options.ShowDoconutInfo = false;
});
builder.Services.AddDistributedMemoryCache(); // セッション状態にはキャッシュが必要です（MVC/Razor Pages はすでに追加されています）
builder.Services.AddSession(options =>
{
    options.IdleTimeout        = TimeSpan.FromSeconds(3600);
    options.Cookie.HttpOnly    = true;
    options.Cookie.IsEssential = true;
});

// 一部のドキュメント形式でのマルチバイトエンコーディングに必要です。
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

app.UseStaticFiles();
app.UseRouting();
app.UseSession();
app.UseDoconutResources();   // ドキュメント ブランチの前
app.MapWhen(
    context => context.Request.Path.Value?.EndsWith("DocImage.axd", StringComparison.OrdinalIgnoreCase) == true,
    branch => branch.UseDoconut());

<div id="divDocViewer">
    <div id="div_ctlDoc"></div>
</div>

<nav id="toolbar" aria-label="Document viewer controls">
    <!-- ビューアのナビゲーション、ズーム、検索、注釈ボタン -->
</nav>

<div id="searchBarMount"></div>
<div id="annBarMount"></div>

<div id="divDocViewer">
    <div id="div_ctlDoc"></div>
</div>

@inject Doconut.Viewer Viewer

@Html.Raw(Viewer.ReferenceCss(new CssConfig
{
    IncludeBootstrapCss = true,
    IncludeViewerCss    = true
}))

@Html.Raw(Viewer.ReferenceScripts(new ScriptConfig
{
    IncludeJQuery        = true,
    IncludeBootstrap     = true,
    IncludeViewerScripts = true
}))

@Html.Raw(Viewer.ReferenceCss(new CssConfig
{
    IncludeBootstrapCss  = true,
    IncludeViewerCss     = true,
    IncludeSearchCss     = true,
    IncludeAnnotationCss = true
}))

@Html.Raw(Viewer.ReferenceScripts(new ScriptConfig
{
    IncludeJQuery            = true,
    IncludeBootstrap         = true,
    IncludeViewerScripts     = true,
    IncludeSearchScripts     = true,
    IncludeSearchBar         = true,
    IncludeAnnotationScripts = true,
    IncludeAnnotationBar     = true
}))

let searchBar = null;
let annBar = null;

const objViewer = $('#div_ctlDoc').docViewer({
    showThumbs: true,
    autoLoad:   false,
    pageZoom:   100,
    FitType:    'width',
    BasePath:   '/',
    ResPath:    'doconut-res/images',
    onViewerReady: function () {
        // pages are visible; safe to hide a loading spinner here
    },
    // Forward annotation lifecycle events to the embedded ribbon when it is present.
    onAnnLoaded:    () => annBar?.handleAnnLoaded(),
    onAnnSaved:     () => annBar?.handleAnnSaved(),
    onAnnSaveError: () => annBar?.handleAnnSaveError(),
    onAnnClosed:    () => annBar?.handleAnnClosed(),
    onError: function (message) {
        console.error('Doconut viewer error:', message);
    }
});

<nav id="toolbar" aria-label="Document viewer controls">
    <button type="button" onclick="objViewer.GotoPage(1)">First</button>
    <button type="button" onclick="objViewer.Next(false)">Previous</button>
    <button type="button" onclick="objViewer.Next(true)">Next</button>
    <button type="button" onclick="objViewer.GotoPage(objViewer.TotalPages())">Last</button>
    <button type="button" onclick="objViewer.Zoom(false)">Zoom out</button>
    <button type="button" onclick="objViewer.Zoom(true)">Zoom in</button>
    <button type="button" onclick="objViewer.FitType('width')">Fit width</button>
    <button type="button" onclick="objViewer.FitType('height')">Fit height</button>
    <button type="button" id="openSearch">Search</button>
    <button type="button" id="openAnnotations">Annotations</button>
</nav>

<script>
    let currentToken = '';

    const refitViewer = () =>
        requestAnimationFrame(() => objViewer.Refit());

    @if (Viewer.IsSearchEnabled)
    {
        <text>
    searchBar = $('#searchBarMount').doconutSearchBar({
        docId: 'ctlDoc',
        getRequestParams: () => ({ token: currentToken }),
        onLayout: refitViewer
    });
    searchBar.attach(objViewer);
        </text>
    }

    @if (Viewer.IsAnnotationEnabled)
    {
        <text>
    annBar = $('#annBarMount').doconutAnnotationBar({
        docId: 'ctlDoc',
        getRequestParams: () => ({ token: currentToken }),
        onLayout: refitViewer
    });
    annBar.attach(objViewer);
        </text>
    }

    document.getElementById('openSearch').addEventListener('click', () => {
        if (!searchBar) return;
        searchBar.isOpen() ? searchBar.close() : searchBar.open();
    });

    document.getElementById('openAnnotations').addEventListener('click', () => {
        if (!annBar) return;
        annBar.isOpen() ? annBar.close() : annBar.open();
    });
</script>

app.MapPost("/api/open", async (Viewer viewer) =>
{
    // トークンは不透明です — ウィジェットに渡すだけにし、決してログに記録したり永続化したりしないでください。
    string token = await viewer.OpenDocumentAsync("wwwroot/files/Sample.pdf");
    return Results.Ok(new { token });
});

fetch('/api/open', { method: 'POST' })
    .then(resp => resp.json())
    .then(data => {
        currentToken = data.token;
        objViewer.View(currentToken);
    });

AddDoconut + middleware
    -> render CSS/scripts and mount div
    -> initialize docViewer
    -> OpenDocumentAsync
    -> return opaque token
    -> objViewer.View(token)
    -> page/search/annotation requests
    -> Close / CloseDocument