I have a simple C# app using the cefSharp chromium browser that I am loading a webpage with. Problem is a mailto link does not redirect to the default mail client. I have been reading and it appears that I need to add a handler. Documentation says to use the OnBeforeResourceLoad. I have tried every way I can think of but cant get it to work. I was hoping someone could add to the code I have here that would include the class (in the proper location and and anything else to get it to work. Here is a link that I was trying to use the information, but don't know how to implement it.
How to open a link in a native browser from CefSharp 3
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.Windows.Forms;
using CefSharp;
using CefSharp.WinForms;
namespace WindowsFormsApp4
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitBrowser();
}
private void Form1_Load(object sender, EventArgs e)
{
}
public ChromiumWebBrowser browser;
public void InitBrowser()
{
Cef.Initialize(new CefSettings());
browser = new ChromiumWebBrowser("https://google.com");
this.Controls.Add(browser);
browser.Dock = DockStyle.Fill;
}
}
}
Here is one of the ways I was trying but could not get to work.
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.Windows.Forms;
using CefSharp;
using CefSharp.WinForms;
namespace WindowsFormsApp4
{
public class BrowserRequestHandler : IRequestHandler
{
public bool OnBeforeBrowse(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, bool isRedirect)
{
// Open in Default browser
if (!request.Url.StartsWith("mailto:"))
{
System.Diagnostics.Process.Start(request.Url);
return true;
}
return false;
}
}
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitBrowser();
}
private void Form1_Load(object sender, EventArgs e)
{
}
public ChromiumWebBrowser browser;
public void InitBrowser()
{
Cef.Initialize(new CefSettings());
browser = new ChromiumWebBrowser("https://google.com");
browser.RequestHandler = new BrowserRequestHandler();
this.Controls.Add(browser);
browser.Dock = DockStyle.Fill;
}
}
}
I added
using CefSharp.Handler;
and now I do not get an error but it does not even pop up the message box. This is what I have:
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.Windows.Forms;
using CefSharp;
using CefSharp.WinForms;
using CefSharp.Handler;
namespace CefSharp
{
}
namespace WindowsFormsApp4
{
public class CustomResourceRequestHandler : ResourceRequestHandler
{
public bool OnBeforeBrowse(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, bool isRedirect)
{
System.Windows.Forms.MessageBox.Show("Test");
// Open in Default browser
if (!request.Url.StartsWith("mailto:"))
{
System.Diagnostics.Process.Start(request.Url);
return true;
}
return false;
}
}
public class CustomRequestHandler : RequestHandler
{
protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
{
return new CustomResourceRequestHandler();
}
}
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitBrowser();
}
private void Form1_Load(object sender, EventArgs e)
{
}
public ChromiumWebBrowser browser;
public void InitBrowser()
{
Cef.Initialize(new CefSettings());
browser = new ChromiumWebBrowser("https://google.com");
browser.RequestHandler = new CustomRequestHandler();
this.Controls.Add(browser);
browser.Dock = DockStyle.Fill;
}
}
}
I got it to work, but I would like your input if it I am doing this correctly.
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.Windows.Forms;
using CefSharp;
using CefSharp.WinForms;
using CefSharp.Handler;
namespace WindowsFormsApp4
{
public class CustomResourceRequestHandler : ResourceRequestHandler
{
protected override CefReturnValue OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback)
{
if (request.Url.StartsWith("mailto:"))
{
System.Diagnostics.Process.Start(request.Url);
return CefReturnValue.Cancel;
}
return CefReturnValue.Continue;
}
}
public class CustomRequestHandler : RequestHandler
{
protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
{
return new CustomResourceRequestHandler();
}
}
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitBrowser();
}
private void Form1_Load(object sender, EventArgs e)
{
}
public ChromiumWebBrowser browser;
public void InitBrowser()
{
Cef.Initialize(new CefSettings());
browser = new ChromiumWebBrowser("http://www.google.com");
browser.RequestHandler = new CustomRequestHandler();
this.Controls.Add(browser);
browser.Dock = DockStyle.Fill;
}
}
}
