Fix storage metrics not being accurate

SharepointToolbox/Services/Export/ExportFileWriter.cs

@@ -24,4 +24,41 @@ internal static class ExportFileWriter
     /// <summary>Writes <paramref name="html"/> to <paramref name="filePath"/> as UTF-8 without BOM.</summary>
     public static Task WriteHtmlAsync(string filePath, string html, CancellationToken ct)
         => File.WriteAllTextAsync(filePath, html, Utf8NoBom, ct);
+
+    /// <summary>
+    /// Streams a <see cref="StringBuilder"/> directly to disk as UTF-8 with
+    /// BOM, chunk by chunk. Avoids the full-document <c>ToString()</c> copy
+    /// and the separate UTF-8 byte buffer that <see cref="File.WriteAllTextAsync(string, string, Encoding, CancellationToken)"/>
+    /// would otherwise allocate — meaningful for large CSV exports.
+    /// </summary>
+    public static Task WriteCsvChunksAsync(string filePath, StringBuilder builder, CancellationToken ct)
+        => WriteChunksAsync(filePath, builder, Utf8WithBom, ct);
+
+    /// <summary>
+    /// Streams a <see cref="StringBuilder"/> directly to disk as UTF-8 without
+    /// BOM. Same rationale as <see cref="WriteCsvChunksAsync"/> — for large
+    /// HTML reports it halves peak memory by skipping the intermediate string.
+    /// </summary>
+    public static Task WriteHtmlChunksAsync(string filePath, StringBuilder builder, CancellationToken ct)
+        => WriteChunksAsync(filePath, builder, Utf8NoBom, ct);
+
+    private static async Task WriteChunksAsync(string filePath, StringBuilder builder, Encoding encoding, CancellationToken ct)
+    {
+        // FileOptions.Asynchronous lets StreamWriter use true async I/O.
+        await using var fs = new FileStream(
+            filePath,
+            FileMode.Create,
+            FileAccess.Write,
+            FileShare.None,
+            bufferSize: 64 * 1024,
+            options: FileOptions.Asynchronous | FileOptions.SequentialScan);
+        await using var sw = new StreamWriter(fs, encoding, bufferSize: 64 * 1024);
+
+        foreach (var chunk in builder.GetChunks())
+        {
+            ct.ThrowIfCancellationRequested();
+            await sw.WriteAsync(chunk, ct);
+        }
+        await sw.FlushAsync(ct);
+    }
 }

SharepointToolbox/Services/Export/StorageCsvExportService.cs

@@ -1,5 +1,6 @@
 using SharepointToolbox.Core.Models;
 using SharepointToolbox.Localization;
+using System.Globalization;
 using System.IO;
 using System.Text;
 
@@ -18,34 +19,58 @@ public class StorageCsvExportService
     /// </summary>
     public string BuildCsv(IReadOnlyList<StorageNode> nodes)
     {
-        var T = TranslationSource.Instance;
-        var sb = new StringBuilder();
+        // Pre-size: ~110 chars/row + header avoids most StringBuilder growth.
+        var sb = new StringBuilder(128 + nodes.Count * 110);
+        WriteCsv(sb, nodes);
+        return sb.ToString();
+    }
 
-        // Header
-        sb.AppendLine($"{T["report.col.library"]},{T["stor.col.kind"]},{T["report.col.site"]},{T["report.stat.files"]},{T["report.col.total_size_mb"]},{T["report.col.version_size_mb"]},{T["report.col.last_modified"]}");
+    private static void WriteCsv(StringBuilder sb, IReadOnlyList<StorageNode> nodes)
+    {
+        var T = TranslationSource.Instance;
+        // Hoist resource lookups out of the row loop: ResourceManager.GetString
+        // is a culture-aware dictionary probe — caching once per export saves
+        // O(rows × columns) lookups on large tenants.
+        string colLibrary  = T["report.col.library"];
+        string colKind     = T["stor.col.kind"];
+        string colSite     = T["report.col.site"];
+        string colFiles    = T["report.stat.files"];
+        string colTotalMb  = T["report.col.total_size_mb"];
+        string colVerMb    = T["report.col.version_size_mb"];
+        string colLastMod  = T["report.col.last_modified"];
+
+        sb.Append(colLibrary).Append(',')
+          .Append(colKind).Append(',')
+          .Append(colSite).Append(',')
+          .Append(colFiles).Append(',')
+          .Append(colTotalMb).Append(',')
+          .Append(colVerMb).Append(',')
+          .AppendLine(colLastMod);
+
+        var kindLabels = BuildKindLabelCache();
 
         foreach (var node in nodes)
         {
-            sb.AppendLine(string.Join(",",
-                Csv(node.Name),
-                Csv(KindLabel(node.Kind)),
-                Csv(node.SiteTitle),
-                node.TotalFileCount.ToString(),
-                FormatMb(node.TotalSizeBytes),
-                FormatMb(node.VersionSizeBytes),
-                node.LastModified.HasValue
-                    ? Csv(node.LastModified.Value.ToString("yyyy-MM-dd"))
-                    : string.Empty));
+            AppendCsvField(sb, node.Name).Append(',');
+            AppendCsvField(sb, kindLabels[(int)node.Kind]).Append(',');
+            AppendCsvField(sb, node.SiteTitle).Append(',');
+            sb.Append(node.TotalFileCount).Append(',');
+            AppendMb(sb, node.TotalSizeBytes).Append(',');
+            AppendMb(sb, node.VersionSizeBytes).Append(',');
+            if (node.LastModified.HasValue)
+                AppendCsvField(sb, node.LastModified.Value.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
+            sb.AppendLine();
         }
-
-        return sb.ToString();
     }
 
     /// <summary>Writes the library-level CSV to <paramref name="filePath"/> with UTF-8 BOM.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, string filePath, CancellationToken ct)
     {
-        var csv = BuildCsv(nodes);
-        await ExportFileWriter.WriteCsvAsync(filePath, csv, ct);
+        // Stream straight to disk: skip the StringBuilder→string copy and the
+        // separate UTF-8 buffer that File.WriteAllTextAsync materializes.
+        var sb = new StringBuilder(128 + nodes.Count * 110);
+        WriteCsv(sb, nodes);
+        await ExportFileWriter.WriteCsvChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>
@@ -53,44 +78,68 @@ public class StorageCsvExportService
     /// </summary>
     public string BuildCsv(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics)
     {
-        var T = TranslationSource.Instance;
-        var sb = new StringBuilder();
+        var sb = new StringBuilder(192 + nodes.Count * 100 + fileTypeMetrics.Count * 40);
+        WriteCsv(sb, nodes, fileTypeMetrics);
+        return sb.ToString();
+    }
+
+    private static void WriteCsv(StringBuilder sb, IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics)
+    {
+        var T = TranslationSource.Instance;
+        string colLibrary  = T["report.col.library"];
+        string colSite     = T["report.col.site"];
+        string colFiles    = T["report.stat.files"];
+        string colTotalMb  = T["report.col.total_size_mb"];
+        string colVerMb    = T["report.col.version_size_mb"];
+        string colLastMod  = T["report.col.last_modified"];
+
+        sb.Append(colLibrary).Append(',')
+          .Append(colSite).Append(',')
+          .Append(colFiles).Append(',')
+          .Append(colTotalMb).Append(',')
+          .Append(colVerMb).Append(',')
+          .AppendLine(colLastMod);
 
-        // Library details
-        sb.AppendLine($"{T["report.col.library"]},{T["report.col.site"]},{T["report.stat.files"]},{T["report.col.total_size_mb"]},{T["report.col.version_size_mb"]},{T["report.col.last_modified"]}");
         foreach (var node in nodes)
         {
-            sb.AppendLine(string.Join(",",
-                Csv(node.Name),
-                Csv(node.SiteTitle),
-                node.TotalFileCount.ToString(),
-                FormatMb(node.TotalSizeBytes),
-                FormatMb(node.VersionSizeBytes),
-                node.LastModified.HasValue
-                    ? Csv(node.LastModified.Value.ToString("yyyy-MM-dd"))
-                    : string.Empty));
+            AppendCsvField(sb, node.Name).Append(',');
+            AppendCsvField(sb, node.SiteTitle).Append(',');
+            sb.Append(node.TotalFileCount).Append(',');
+            AppendMb(sb, node.TotalSizeBytes).Append(',');
+            AppendMb(sb, node.VersionSizeBytes).Append(',');
+            if (node.LastModified.HasValue)
+                AppendCsvField(sb, node.LastModified.Value.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
+            sb.AppendLine();
         }
 
-        // File type breakdown
         if (fileTypeMetrics.Count > 0)
         {
+            string colFileType = T["report.col.file_type"];
+            string colSizeMb   = T["report.col.size_mb"];
+            string colFileCnt  = T["report.col.file_count"];
+            string noExtLabel  = T["report.text.no_extension"];
+
             sb.AppendLine();
-            sb.AppendLine($"{T["report.col.file_type"]},{T["report.col.size_mb"]},{T["report.col.file_count"]}");
+            sb.Append(colFileType).Append(',')
+              .Append(colSizeMb).Append(',')
+              .AppendLine(colFileCnt);
+
             foreach (var m in fileTypeMetrics)
             {
-                string label = string.IsNullOrEmpty(m.Extension) ? T["report.text.no_extension"] : m.Extension;
-                sb.AppendLine(string.Join(",", Csv(label), FormatMb(m.TotalSizeBytes), m.FileCount.ToString()));
+                string label = string.IsNullOrEmpty(m.Extension) ? noExtLabel : m.Extension;
+                AppendCsvField(sb, label).Append(',');
+                AppendMb(sb, m.TotalSizeBytes).Append(',');
+                sb.Append(m.FileCount).AppendLine();
             }
         }
-
-        return sb.ToString();
     }
 
     /// <summary>Writes the two-section CSV (libraries + file-type breakdown) with UTF-8 BOM.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, string filePath, CancellationToken ct)
     {
-        var csv = BuildCsv(nodes, fileTypeMetrics);
-        await ExportFileWriter.WriteCsvAsync(filePath, csv, ct);
+        var sb = new StringBuilder(192 + nodes.Count * 100 + fileTypeMetrics.Count * 40);
+        WriteCsv(sb, nodes, fileTypeMetrics);
+        await ExportFileWriter.WriteCsvChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>
@@ -139,11 +188,27 @@ public class StorageCsvExportService
 
     // ── Helpers ───────────────────────────────────────────────────────────────
 
-    private static string FormatMb(long bytes)
-        => (bytes / (1024.0 * 1024.0)).ToString("F2");
+    private static StringBuilder AppendMb(StringBuilder sb, long bytes)
+        => sb.Append((bytes / (1024.0 * 1024.0)).ToString("F2", CultureInfo.InvariantCulture));
 
-    /// <summary>RFC 4180 CSV field quoting with formula-injection guard.</summary>
-    private static string Csv(string value) => CsvSanitizer.EscapeMinimal(value);
+    private static StringBuilder AppendCsvField(StringBuilder sb, string value)
+        => sb.Append(CsvSanitizer.EscapeMinimal(value));
+
+    /// <summary>
+    /// Pre-resolves localized labels for every <see cref="StorageNodeKind"/>
+    /// once per export, indexed by the enum's int value. Avoids a
+    /// <c>ResourceManager.GetString</c> call per row in hot CSV loops.
+    /// </summary>
+    private static string[] BuildKindLabelCache()
+    {
+        var values = (StorageNodeKind[])Enum.GetValues(typeof(StorageNodeKind));
+        int max = 0;
+        foreach (var v in values) { int i = (int)v; if (i > max) max = i; }
+        var cache = new string[max + 1];
+        for (int i = 0; i < cache.Length; i++) cache[i] = ((StorageNodeKind)i).ToString();
+        foreach (var v in values) cache[(int)v] = KindLabel(v);
+        return cache;
+    }
 
     private static string KindLabel(StorageNodeKind kind)
     {

SharepointToolbox/Services/Export/StorageHtmlExportService.cs

@@ -13,6 +13,8 @@ namespace SharepointToolbox.Services.Export;
 public class StorageHtmlExportService
 {
     private int _togIdx;
+    private string[] _kindLabels = Array.Empty<string>();
+    private string[] _kindLabelsHtml = Array.Empty<string>();
 
     /// <summary>
     /// Builds a self-contained HTML report with one collapsible row per
@@ -21,10 +23,18 @@ public class StorageHtmlExportService
     /// breakdown section is desired.
     /// </summary>
     public string BuildHtml(IReadOnlyList<StorageNode> nodes, ReportBranding? branding = null)
+    {
+        var sb = new StringBuilder(3072 + nodes.Count * 340);
+        BuildHtmlCore(sb, nodes, branding);
+        return sb.ToString();
+    }
+
+    private void BuildHtmlCore(StringBuilder sb, IReadOnlyList<StorageNode> nodes, ReportBranding? branding)
     {
         var T = TranslationSource.Instance;
         _togIdx = 0;
-        var sb = new StringBuilder();
+        _kindLabels = BuildKindLabelCache();
+        _kindLabelsHtml = BuildHtmlEncodedCache(_kindLabels);
 
         sb.AppendLine("<!DOCTYPE html>");
         sb.AppendLine("<html lang=\"en\">");
@@ -60,11 +70,18 @@ public class StorageHtmlExportService
         sb.Append(BrandingHtmlHelper.BuildBrandingHeader(branding));
         sb.AppendLine($"<h1>{T["report.title.storage"]}</h1>");
 
-        // Summary cards
-        var rootNodes0 = nodes.Where(n => n.IndentLevel == 0).ToList();
-        long siteTotal0 = rootNodes0.Sum(n => n.TotalSizeBytes);
-        long versionTotal0 = rootNodes0.Sum(n => n.VersionSizeBytes);
-        long fileTotal0 = rootNodes0.Sum(n => n.TotalFileCount);
+        // Single-pass root aggregation: replaces 4 separate enumerations
+        // (.Where().ToList() + 3× .Sum() + a final .Where() during render).
+        var rootNodes0 = new List<StorageNode>(Math.Min(nodes.Count, 64));
+        long siteTotal0 = 0, versionTotal0 = 0, fileTotal0 = 0;
+        foreach (var n in nodes)
+        {
+            if (n.IndentLevel != 0) continue;
+            rootNodes0.Add(n);
+            siteTotal0    += n.TotalSizeBytes;
+            versionTotal0 += n.VersionSizeBytes;
+            fileTotal0    += n.TotalFileCount;
+        }
 
         sb.AppendLine($"""
             <div style="display:flex;gap:16px;margin:16px 0;flex-wrap:wrap">
@@ -90,10 +107,10 @@ public class StorageHtmlExportService
               <tbody>
             """);
 
-        // Only iterate root-level nodes; RenderNode recurses into Children
-        // inline. Iterating the flat list would render every descendant a
-        // second time as a top-level row.
-        foreach (var node in nodes.Where(n => n.IndentLevel == 0))
+        // Render only the pre-materialized root list — recursing into
+        // Children handles descendants. Iterating the flat list would render
+        // every descendant a second time as a top-level row.
+        foreach (var node in rootNodes0)
         {
             RenderNode(sb, node);
         }
@@ -105,18 +122,24 @@ public class StorageHtmlExportService
 
         sb.AppendLine($"<p class=\"generated\">{T["report.text.generated_colon"]} {DateTime.Now:yyyy-MM-dd HH:mm}</p>");
         sb.AppendLine("</body></html>");
-
-        return sb.ToString();
     }
 
     /// <summary>
     /// Builds an HTML report including a file-type breakdown chart section.
     /// </summary>
     public string BuildHtml(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, ReportBranding? branding = null)
+    {
+        var sb = new StringBuilder(4096 + nodes.Count * 340 + fileTypeMetrics.Count * 220);
+        BuildHtmlCore(sb, nodes, fileTypeMetrics, branding);
+        return sb.ToString();
+    }
+
+    private void BuildHtmlCore(StringBuilder sb, IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, ReportBranding? branding)
     {
         var T = TranslationSource.Instance;
         _togIdx = 0;
-        var sb = new StringBuilder();
+        _kindLabels = BuildKindLabelCache();
+        _kindLabelsHtml = BuildHtmlEncodedCache(_kindLabels);
 
         sb.AppendLine("<!DOCTYPE html>");
         sb.AppendLine("<html lang=\"en\">");
@@ -163,11 +186,17 @@ public class StorageHtmlExportService
         sb.Append(BrandingHtmlHelper.BuildBrandingHeader(branding));
         sb.AppendLine($"<h1>{T["report.title.storage"]}</h1>");
 
-        // ── Summary cards ──
-        var rootNodes = nodes.Where(n => n.IndentLevel == 0).ToList();
-        long siteTotal = rootNodes.Sum(n => n.TotalSizeBytes);
-        long versionTotal = rootNodes.Sum(n => n.VersionSizeBytes);
-        long fileTotal = rootNodes.Sum(n => n.TotalFileCount);
+        // ── Summary cards (single-pass aggregation) ──
+        var rootNodes = new List<StorageNode>(Math.Min(nodes.Count, 64));
+        long siteTotal = 0, versionTotal = 0, fileTotal = 0;
+        foreach (var n in nodes)
+        {
+            if (n.IndentLevel != 0) continue;
+            rootNodes.Add(n);
+            siteTotal    += n.TotalSizeBytes;
+            versionTotal += n.VersionSizeBytes;
+            fileTotal    += n.TotalFileCount;
+        }
 
         sb.AppendLine("<div class=\"stats\">");
         sb.AppendLine($"  <div class=\"stat-card\"><div class=\"value\">{FormatSize(siteTotal)}</div><div class=\"label\">{T["report.stat.total_size"]}</div></div>");
@@ -227,10 +256,10 @@ public class StorageHtmlExportService
               <tbody>
             """);
 
-        // Only iterate root-level nodes; RenderNode recurses into Children
-        // inline. Iterating the flat list would render every descendant a
-        // second time as a top-level row.
-        foreach (var node in nodes.Where(n => n.IndentLevel == 0))
+        // Render only the pre-materialized root list — recursing into
+        // Children handles descendants. Iterating the flat list would render
+        // every descendant a second time as a top-level row.
+        foreach (var node in rootNodes)
         {
             RenderNode(sb, node);
         }
@@ -242,22 +271,24 @@ public class StorageHtmlExportService
 
         sb.AppendLine($"<p class=\"generated\">{T["report.text.generated_colon"]} {DateTime.Now:yyyy-MM-dd HH:mm}</p>");
         sb.AppendLine("</body></html>");
-
-        return sb.ToString();
     }
 
     /// <summary>Writes the library-only HTML report to <paramref name="filePath"/>.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, string filePath, CancellationToken ct, ReportBranding? branding = null)
     {
-        var html = BuildHtml(nodes, branding);
-        await File.WriteAllTextAsync(filePath, html, Encoding.UTF8, ct);
+        // Build into StringBuilder, stream chunks straight to disk —
+        // skips a full-document char-array copy from sb.ToString().
+        var sb = new StringBuilder(3072 + nodes.Count * 340);
+        BuildHtmlCore(sb, nodes, branding);
+        await ExportFileWriter.WriteHtmlChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>Writes the HTML report including the file-type breakdown chart.</summary>
     public async Task WriteAsync(IReadOnlyList<StorageNode> nodes, IReadOnlyList<FileTypeMetric> fileTypeMetrics, string filePath, CancellationToken ct, ReportBranding? branding = null)
     {
-        var html = BuildHtml(nodes, fileTypeMetrics, branding);
-        await File.WriteAllTextAsync(filePath, html, Encoding.UTF8, ct);
+        var sb = new StringBuilder(4096 + nodes.Count * 340 + fileTypeMetrics.Count * 220);
+        BuildHtmlCore(sb, nodes, fileTypeMetrics, branding);
+        await ExportFileWriter.WriteHtmlChunksAsync(filePath, sb, ct);
     }
 
     /// <summary>
@@ -313,21 +344,7 @@ public class StorageHtmlExportService
             ? $"<button class=\"toggle-btn\" onclick=\"toggle({myIdx})\">&#9654;</button>{HtmlEncode(node.Name)}"
             : $"<span style=\"margin-left:{node.IndentLevel * 16}px\">{HtmlEncode(node.Name)}</span>";
 
-        string lastMod = node.LastModified.HasValue
-            ? node.LastModified.Value.ToString("yyyy-MM-dd")
-            : string.Empty;
-
-        sb.AppendLine($"""
-              <tr>
-                <td>{nameCell}</td>
-                <td>{HtmlEncode(KindLabel(node.Kind))}</td>
-                <td>{HtmlEncode(node.SiteTitle)}</td>
-                <td class="num">{node.TotalFileCount:N0}</td>
-                <td class="num">{FormatSize(node.TotalSizeBytes)}</td>
-                <td class="num">{FormatSize(node.VersionSizeBytes)}</td>
-                <td>{lastMod}</td>
-              </tr>
-            """);
+        AppendRow(sb, node, nameCell);
 
         if (hasChildren)
         {
@@ -352,21 +369,7 @@ public class StorageHtmlExportService
             ? $"<span style=\"{indent}\"><button class=\"toggle-btn\" onclick=\"toggle({myIdx})\">&#9654;</button>{HtmlEncode(node.Name)}</span>"
             : $"<span style=\"{indent}\">{HtmlEncode(node.Name)}</span>";
 
-        string lastMod = node.LastModified.HasValue
-            ? node.LastModified.Value.ToString("yyyy-MM-dd")
-            : string.Empty;
-
-        sb.AppendLine($"""
-              <tr>
-                <td>{nameCell}</td>
-                <td>{HtmlEncode(KindLabel(node.Kind))}</td>
-                <td>{HtmlEncode(node.SiteTitle)}</td>
-                <td class="num">{node.TotalFileCount:N0}</td>
-                <td class="num">{FormatSize(node.TotalSizeBytes)}</td>
-                <td class="num">{FormatSize(node.VersionSizeBytes)}</td>
-                <td>{lastMod}</td>
-              </tr>
-            """);
+        AppendRow(sb, node, nameCell);
 
         if (hasChildren)
         {
@@ -381,6 +384,35 @@ public class StorageHtmlExportService
         }
     }
 
+    /// <summary>
+    /// Appends one data row given the pre-rendered name cell. Hot path:
+    /// pulls localized kind labels from <see cref="_kindLabelsHtml"/> instead
+    /// of going through <c>ResourceManager.GetString</c> + <c>HtmlEncode</c>
+    /// per row.
+    /// </summary>
+    private void AppendRow(StringBuilder sb, StorageNode node, string nameCell)
+    {
+        int kindIdx = (int)node.Kind;
+        string kindLabel = (uint)kindIdx < (uint)_kindLabelsHtml.Length
+            ? _kindLabelsHtml[kindIdx]
+            : HtmlEncode(node.Kind.ToString());
+        string lastMod = node.LastModified.HasValue
+            ? node.LastModified.Value.ToString("yyyy-MM-dd")
+            : string.Empty;
+
+        sb.AppendLine($"""
+              <tr>
+                <td>{nameCell}</td>
+                <td>{kindLabel}</td>
+                <td>{HtmlEncode(node.SiteTitle)}</td>
+                <td class="num">{node.TotalFileCount:N0}</td>
+                <td class="num">{FormatSize(node.TotalSizeBytes)}</td>
+                <td class="num">{FormatSize(node.VersionSizeBytes)}</td>
+                <td>{lastMod}</td>
+              </tr>
+            """);
+    }
+
     private static string FormatSize(long bytes)
     {
         if (bytes >= 1_073_741_824L) return $"{bytes / 1_073_741_824.0:F2} GB";
@@ -406,4 +438,28 @@ public class StorageHtmlExportService
             _ => kind.ToString()
         };
     }
+
+    /// <summary>
+    /// Pre-resolves localized labels for every <see cref="StorageNodeKind"/>
+    /// once per export. Cached array index lookup avoids
+    /// <c>ResourceManager.GetString</c> per row in hot rendering loops.
+    /// </summary>
+    private static string[] BuildKindLabelCache()
+    {
+        var values = (StorageNodeKind[])Enum.GetValues(typeof(StorageNodeKind));
+        int max = 0;
+        foreach (var v in values) { int i = (int)v; if (i > max) max = i; }
+        var cache = new string[max + 1];
+        for (int i = 0; i < cache.Length; i++) cache[i] = ((StorageNodeKind)i).ToString();
+        foreach (var v in values) cache[(int)v] = KindLabel(v);
+        return cache;
+    }
+
+    /// <summary>HTML-encodes each entry of <paramref name="raw"/> once.</summary>
+    private static string[] BuildHtmlEncodedCache(string[] raw)
+    {
+        var encoded = new string[raw.Length];
+        for (int i = 0; i < raw.Length; i++) encoded[i] = HtmlEncode(raw[i]);
+        return encoded;
+    }
 }