C#打開瀏覽器

public class BrowserHelper
    {
        /// <summary>
        /// 調用系統瀏覽器打開網頁
        /// </summary>
        /// <param name="url">打開網頁的鏈接</param>
        public static void OpenBrowserUrl(string url)
        {
            try
            {
                // 64位注冊表路徑
                var openKey = @"SOFTWARE\Wow6432Node\Google\Chrome";
                if (IntPtr.Size == 4)
                {
                    // 32位注冊表路徑
                    openKey = @"SOFTWARE\Google\Chrome";
                }
                RegistryKey appPath = Registry.LocalMachine.OpenSubKey(openKey);
                // 谷歌瀏覽器就用谷歌打開，沒找到就用系統默認的瀏覽器
                // 谷歌卸載了，注冊表還沒有清空，程序會返回一個"系統找不到指定的文件。"的bug
                if (appPath != null)
                {
                    var result = Process.Start("chrome.exe", url);
                    if (result == null)
                    {
                        OpenIe(url);
                    }
                }
                else
                {
                    var result = Process.Start("chrome.exe", url);
                    if (result == null)
                    {
                        OpenDefaultBrowserUrl(url);
                    }
                }
            }
            catch
            {
                // 出錯調用用戶默認設置的瀏覽器，還不行就調用IE
                OpenDefaultBrowserUrl(url);
            }
        }

        /// <summary>
        /// 用IE打開瀏覽器
        /// </summary>
        /// <param name="url"></param>
        public static void OpenIe(string url)
        {
            try
            {
                Process.Start("iexplore.exe", url);
            }
            catch (Exception ex)
            {
                // IE瀏覽器路徑安裝：C:\Program Files\Internet Explorer
                // at System.Diagnostics.process.StartWithshellExecuteEx(ProcessStartInfo startInfo)注意這個錯誤
                try
                {
                    if (File.Exists(@"C:\Program Files\Internet Explorer\iexplore.exe"))
                    {
                        ProcessStartInfo processStartInfo = new ProcessStartInfo
                        {
                            FileName = @"C:\Program Files\Internet Explorer\iexplore.exe",
                            Arguments = url,
                            UseShellExecute = false,
                            CreateNoWindow = true
                        };
                        Process.Start(processStartInfo);
                    }
                    else
                    {
                        if (File.Exists(@"C:\Program Files (x86)\Internet Explorer\iexplore.exe"))
                        {
                            ProcessStartInfo processStartInfo = new ProcessStartInfo
                            {
                                FileName = @"C:\Program Files (x86)\Internet Explorer\iexplore.exe",
                                Arguments = url,
                                UseShellExecute = false,
                                CreateNoWindow = true
                            };
                            Process.Start(processStartInfo);
                        }
                        else
                        {
                            if (MessageBox.Show(@"系統未安裝IE瀏覽器，是否下載安裝？", null, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes)
                            {
                                // 打開下載鏈接，從微軟官網下載
                                OpenDefaultBrowserUrl("http://windows.microsoft.com/zh-cn/internet-explorer/download-ie");
                            }
                        }
                    }
                }
                catch (Exception exception)
                {
                    //MessageBox.Show(exception.Message);
                }
            }
        }

        /// <summary>
        /// 打開系統默認瀏覽器（用戶自己設置了默認瀏覽器）
        /// </summary>
        /// <param name="url"></param>
        public static void OpenDefaultBrowserUrl(string url)
        {
            try
            {
                // 方法1
                //從注冊表中讀取默認瀏覽器可執行文件路徑
                RegistryKey key = Registry.ClassesRoot.OpenSubKey(@"http\shell\open\command\");
                if (key != null)
                {
                    string s = key.GetValue("").ToString();
                    //s就是你的默認瀏覽器，不過后面帶了參數，把它截去，不過需要注意的是：不同的瀏覽器后面的參數不一樣！
                    //"D:\Program Files (x86)\Google\Chrome\Application\chrome.exe" -- "%1"
                    var lastIndex = s.IndexOf(".exe", StringComparison.Ordinal);
                    if (lastIndex == -1)
                    {
                        lastIndex = s.IndexOf(".EXE", StringComparison.Ordinal);
                    }
                    var path = s.Substring(1, lastIndex + 3);
                    var result = Process.Start(path, url);
                    if (result == null)
                    {
                        // 方法2
                        // 調用系統默認的瀏覽器 
                        var result1 = Process.Start("explorer.exe", url);
                        if (result1 == null)
                        {
                            // 方法3
                            Process.Start(url);
                        }
                    }
                }
                else
                {
                    // 方法2
                    // 調用系統默認的瀏覽器 
                    var result1 = Process.Start("explorer.exe", url);
                    if (result1 == null)
                    {
                        // 方法3
                        Process.Start(url);
                    }
                }
            }
            catch
            {
                OpenIe(url);
            }
        }

        /// <summary>
        /// 火狐瀏覽器打開網頁
        /// </summary>
        /// <param name="url"></param>
        public static void OpenFireFox(string url)
        {
            try
            {
                // 64位注冊表路徑
                var openKey = @"SOFTWARE\Wow6432Node\Mozilla\Mozilla Firefox";
                if (IntPtr.Size == 4)
                {
                    // 32位注冊表路徑
                    openKey = @"SOFTWARE\Mozilla\Mozilla Firefox";
                }
                RegistryKey appPath = Registry.LocalMachine.OpenSubKey(openKey);
                if (appPath != null)
                {
                    var result = Process.Start("firefox.exe", url);
                    if (result == null)
                    {
                        OpenIe(url);
                    }
                }
                else
                {
                    var result = Process.Start("firefox.exe", url);
                    if (result == null)
                    {
                        OpenDefaultBrowserUrl(url);
                    }
                }
            }
            catch
            {
                OpenDefaultBrowserUrl(url);
            }
        }
    }