CefSharp ——js呼叫c#方法

摘要

有時我們在winform中嵌入瀏覽器，需要在頁面上讀取電腦上的一些資訊，這個時候就需要用到CefSharp的RegisterJsObject進行註冊方法然後供js進行呼叫了。

一個例子

我們在winform中嵌入的頁面中，顯示電腦的資訊，電腦資訊透過winform進行讀取，js呼叫獲取電腦資訊的方法，並將最終結果以json字串的形式傳遞到js端，js獲取到這些資訊並在頁面上進行顯示。

定義一個專門處理js回撥的類

    /// 

    /// js c#回撥類
    /// 
    class ScriptCallbackManager
    {
        /// 

        /// 查詢電腦資訊
        /// 
        /// 
        public void FindComputerInfo(IJavascriptCallback javascriptCallback)
        {

            Task.Factory.StartNew(async () =>
            {

                using (javascriptCallback)
                {
                    Computer computer = new Computer();
                    string response = JsonConvert.SerializeObject(new
                    {
                        cpu_id = computer.CPU_Id,
                        disk_id = computer.Disk_Id,
                        host_name = computer.HostName,
                        networkcard = computer.NetworkCard,
                        serialNumber = computer.SerialNumber_Manufacturer_Product.Item1,
                        manufacturer = computer.SerialNumber_Manufacturer_Product.Item2,
                        product = computer.SerialNumber_Manufacturer_Product.Item3,
                    });
                    await javascriptCallback.ExecuteAsync(response);
                }
            });

        }


    }

其中computer類為獲取電腦資訊的操作類

    /// 

    /// 電腦資訊類
    /// 
    public class Computer
    {
        /// 

        /// 查詢cpu的id
        /// 
        /// 
        public string CPU_Id
        {
            get
            {
                try
                {
                    string str = string.Empty;
                    ManagementClass mcCPU = new ManagementClass("win32_Processor");
                    ManagementObjectCollection mocCPU = mcCPU.GetInstances();
                    foreach (ManagementObject m in mocCPU)
                    {
                        str = m["Processorid"].ToString().Trim().Substring(0, 8);
                        break;
                    }
                    return str;
                }
                catch (Exception)
                {
                    return string.Empty;
                }
            }
        }
        public string Disk_Id
        {
            get
            {
                try
                {
                    string hdId = string.Empty;
                    ManagementClass hardDisk = new ManagementClass("win32_DiskDrive");
                    ManagementObjectCollection hardDiskC = hardDisk.GetInstances();
                    foreach (ManagementObject m in hardDiskC)
                    {
                        hdId = m.Properties["Model"].Value.ToString();//WDC WD800BB-56JKC0
                        break;
                    }
                    return hdId;
                }
                catch (Exception)
                {

                    return string.Empty;
                }
            }
        }
        /// 

        /// 網路卡
        /// 
        public string NetworkCard
        {
            get
            {
                try
                {
                    string MoAddress = string.Empty;
                    ManagementClass networkAdapter = new ManagementClass("Win32_NetworkAdapterConfiguration");
                    ManagementObjectCollection adapterC = networkAdapter.GetInstances();
                    foreach (ManagementObject m in adapterC)
                    {
                        if ((bool)m["IPEnabled"] == true)
                        {
                            MoAddress = m["MacAddress"].ToString().Trim();
                            m.Dispose();
                        }
                    }
                    return MoAddress;
                }
                catch
                {
                    return string.Empty;
                }
            }
        }
        /// 

        /// 獲取序列號，製造商，型號
        /// 
        public Tuple SerialNumber_Manufacturer_Product
        {
            get
            {
                try
                {
                    Tuple tuple = null; new Tuple(string.Empty, 
string.Empty, string.Empty);
                    ManagementObjectSearcher mos = new ManagementObjectSearcher("select * from Win32_baseboard");


                    foreach (ManagementObject m in mos.Get())
                    {
                        tuple = new Tuple(m["SerialNumber"].ToString(), m["Manufacturer"].ToString(),
 m["Product"].ToString());
                    }
                    return tuple;
                }
                catch (Exception)
                {

                    return null;
                }
            }
        }
        /// 

        /// 計算機名稱
        /// 
        public string HostName
        {
            get
            {
                return System.Net.Dns.GetHostName();
            }
        }
    }

嵌入的頁面

html>



    
    
    

    獲取電腦資訊
    

單擊按鈕，在頁面上顯示當前電腦資訊

窗體程式碼

    /// 

    /// 主窗體
    /// 
    public partial class MainFrm : Form
    {
        private CefSharp.CefSettings _settings;
        CefSharp.WinForms.ChromiumWebBrowser _webView;
        public MainFrm()
        {
            InitializeComponent();
            _settings = new CefSharp.CefSettings();
            CefSharp.Cef.Initialize(_settings);
            this.FormClosed += MainFrm_FormClosed;
        }

        void MainFrm_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (_webView != null)
            {
                _webView.Dispose();
            }
        }

        private void MainFrm_Load(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Maximized;
            string url = "file:///E:/xxx/bin/x64/Debug/lenovo/test.html";
            LoadPage(url);
            
        }
        /// 

        /// 載入頁面
        /// 
        /// 
        private void LoadPage(string url)
        {
            if (_webView == null)
            {
                _webView = new CefSharp.WinForms.ChromiumWebBrowser(url);
                _webView.Dock = DockStyle.Fill;
                _webView.LifeSpanHandler = new OpenPageSelf();
                _webView.RegisterJsObject("googleBrower", new ScriptCallbackManager(), 
new CefSharp.BindingOptions { CamelCaseJavascriptNames = false });
                this.Controls.Add(_webView);
            }
            else
            {
                _webView.Load(url);
            }
        }
    }

測試

總結

透過在winform嵌入瀏覽器，可以很方便處理h5頁面的展示，不用再使用winform再開發一個客戶端的程式，完全可以嵌入要開發的h5應用，這樣完全應用了h5的特點，可以在電腦端，移動端訪問，而不是每個終端都寫程式碼。