ShaoHua
100 lines
2.7 KiB
C#
100 lines
2.7 KiB
C#
using System.Reflection;
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namespace Hua.Todo.Maui.Platforms.Windows;
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internal static class WebView2RuntimeDetector
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{
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/// <summary>
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/// 判断当前 Windows 系统是否可用 WebView2 Runtime。
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/// 优先通过已知的 Evergreen 安装目录探测（避免因托管程序集缺失/裁剪导致误判），
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/// 其次再尝试通过 WebView2 SDK 的 <c>CoreWebView2Environment.GetAvailableBrowserVersionString</c> 获取版本。
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/// </summary>
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/// <param name="version">检测到的运行时版本（若可用）。</param>
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/// <returns>若系统存在可用的 WebView2 Runtime，则返回 <c>true</c>；否则返回 <c>false</c>。</returns>
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internal static bool IsRuntimeInstalled(out string? version)
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{
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version = null;
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try
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{
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version = TryGetEvergreenVersionFromKnownLocations();
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if (!string.IsNullOrWhiteSpace(version))
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{
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return true;
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}
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var type = Type.GetType("Microsoft.Web.WebView2.Core.CoreWebView2Environment, Microsoft.Web.WebView2.Core");
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if (type == null)
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{
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return false;
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}
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version = TryInvokeVersionGetter(type);
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return !string.IsNullOrWhiteSpace(version);
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}
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catch
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{
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return false;
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}
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}
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private static string? TryGetEvergreenVersionFromKnownLocations()
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{
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var candidates = new[]
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{
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Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86), "Microsoft", "EdgeWebView", "Application"),
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Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles), "Microsoft", "EdgeWebView", "Application"),
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Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Microsoft", "EdgeWebView", "Application"),
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};
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Version? best = null;
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foreach (var baseDir in candidates)
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{
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if (string.IsNullOrWhiteSpace(baseDir) || !Directory.Exists(baseDir))
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{
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continue;
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}
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foreach (var dir in Directory.EnumerateDirectories(baseDir))
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{
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var name = Path.GetFileName(dir);
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if (!Version.TryParse(name, out var v))
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{
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continue;
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}
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if (!File.Exists(Path.Combine(dir, "msedgewebview2.exe")))
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{
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continue;
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}
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if (best == null || v > best)
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{
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best = v;
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}
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}
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}
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return best?.ToString();
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}
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private static string? TryInvokeVersionGetter(Type environmentType)
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{
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var noArg = environmentType.GetMethod("GetAvailableBrowserVersionString", BindingFlags.Public | BindingFlags.Static, Type.DefaultBinder, Type.EmptyTypes, null);
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if (noArg != null)
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{
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return noArg.Invoke(null, null) as string;
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}
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var oneArg = environmentType.GetMethod("GetAvailableBrowserVersionString", BindingFlags.Public | BindingFlags.Static, Type.DefaultBinder, new[] { typeof(string) }, null);
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if (oneArg != null)
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{
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return oneArg.Invoke(null, new object?[] { null }) as string;
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}
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return null;
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}
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}
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