CefSharp 能 在C# winform 中實現 瀏覽器 功能

同樣的在瀏覽器中 網頁上如果有 下載 按鈕 實現下載功能

直接上程式碼

CefSharp 在winform上實現 瀏覽器功能

using System;
using System.Text;
using System.Windows.Forms;

using CefSharp;
using CefSharp.WinForms;

public ChromiumWebBrowser browser;
public void InitBrowser()
{
   //Cef.Initialize(new CefSettings());
 

   browser = new ChromiumWebBrowser("https://ai.12348.gov.cn/pc/");

   browser.LifeSpanHandler = new LifeSpanHandler();//超連結不彈新窗體

   browser.DownloadHandler = new DownloadHandler();//下載

   this.panel1.Controls.Add(browser);//panel
            
}

重點： 建立CustomDownloadHandler類並實現IDownloadHandler介面

建立 DownloadHandler.cs 檔案

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//using System.Web.Script.Serialization;
using System.Windows.Forms;
using CefSharp;
using CefSharp.WinForms;
using
 
 System.IO;

namespace LawSever
{
    public class DownloadHandler : IDownloadHandler
    {
        public event EventHandler<DownloadItem> OnBeforeDownloadFired;

        public event EventHandler<DownloadItem> OnDownloadUpdatedFired;

        public void OnBeforeDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
        {
            //throw new NotImplementedException();
            var handler = OnBeforeDownloadFired;

            if (handler != null)
            {
                handler(this, downloadItem);
            }

            if (!callback.IsDisposed)
            {
                //using (callback)
                //{
                //    callback.Continue(downloadItem.SuggestedFileName, showDialog: true);
                //}
                using (callback)
                {
                    //好用 downloadItem.SuggestedFileName為下載的檔名  
                    //callback.Continue(@"C:\Users\" +
                    //        System.Security.Principal.WindowsIdentity.GetCurrent().Name + @"\Downloads\" +
                    //        downloadItem.SuggestedFileName,
                    //    showDialog: false);

                    string strDownloadFile = @"c:\DownloadFile\file.docx";//手動指定下載目錄和下載檔名

                    callback.Continue(@strDownloadFile,showDialog: false);
                }
            }
        }

        public void OnDownloadUpdated(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
        {
            //下載過程中 呼叫多次
        }

        public void OnBeforeDownload(IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
        {
            //沒有被呼叫
        }

        public void OnDownloadUpdated(IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
        {
            //沒有被呼叫
            //var handler = OnDownloadUpdatedFired;
            //if (handler != null)
            //{
            //    handler(this, downloadItem);
            //}
        }

    }
}

超連結不彈新窗體
建立  LifeSpanHandler.cs 檔案

using CefSharp;
using CefSharp.WinForms;

namespace LawSever
{
    internal class LifeSpanHandler : ILifeSpanHandler
    {
        //彈出前觸發的事件
        public bool OnBeforePopup(IWebBrowser webBrowser, IBrowser browser, IFrame frame, string targetUrl,
            string targetFrameName, WindowOpenDisposition targetDisposition, bool userGesture, IPopupFeatures popupFeatures,
            IWindowInfo windowInfo, IBrowserSettings browserSettings, ref bool noJavascriptAccess, out IWebBrowser newBrowser)
        {
            //使用源視窗開啟連結，取消建立新視窗
            newBrowser = null;
            var chromiumWebBrowser = (ChromiumWebBrowser)webBrowser;
            chromiumWebBrowser.Load(targetUrl);
            return true;
        }

        public void OnAfterCreated(IWebBrowser chromiumWebBrowser, IBrowser browser)
        {

        }

        public bool DoClose(IWebBrowser chromiumWebBrowser, IBrowser browser)
        {
            return true;
        }

        public void OnBeforeClose(IWebBrowser chromiumWebBrowser, IBrowser browser)
        {

        }
    }

}

 感謝：

https://www.javaroad.cn/questions/288431

https://www.cnblogs.com/mchao/p/13935777.html