- 1 year ago
Executing Javascript from .Net (IE doesn't run in session 0)
To execute JavaScript from .NET code and overcome the session 0 isolation issue with Internet Explorer, you can use a headless browser or a web browser control. One common solution is to use the CefSharp library, which is a .NET wrapper for the Chromium Embedded Framework (CEF). CefSharp allows you to embed a full-featured Chromium browser in your .NET application and execute JavaScript code.
Here's a step-by-step guide on how to execute JavaScript using CefSharp in a .NET application:
Install CefSharp NuGet Package:
In your Visual Studio project, install the CefSharp.WinForms or CefSharp.Wpf NuGet package, depending on whether you are using Windows Forms or WPF.Initialize CefSharp:
In your application startup, before using the CefSharp library, you need to initialize CefSharp by calling theCef.Initialize
method. For example:csharpCef.Initialize(new CefSettings());
Create a WebView Control:
Add a Windows Forms WebBrowser control or a WPF ChromiumWebBrowser control to your form or window.Execute JavaScript Code:
You can execute JavaScript code on the WebView control using theEvaluateScriptAsync
method. For example:csharpvar result = await webView.EvaluateScriptAsync("2 + 2");
if (result.Success && result.Result is int)
{
int resultValue = (int)result.Result;
// Do something with the resultValue.
}
Handle CefSharp Shutdown:
When your application exits, you should shut down CefSharp by callingCef.Shutdown()
.
Here's a complete example of a Windows Forms application that uses CefSharp to execute JavaScript:
csharpusing CefSharp;
using CefSharp.WinForms;
using System;
using System.Windows.Forms;
namespace CefSharpExample
{
public partial class Form1 : Form
{
private ChromiumWebBrowser webView;
public Form1()
{
InitializeComponent();
// Initialize CefSharp
Cef.Initialize(new CefSettings());
// Create the WebView control
webView = new ChromiumWebBrowser("about:blank");
webView.Dock = DockStyle.Fill;
this.Controls.Add(webView);
// Execute JavaScript
ExecuteJavaScript();
}
private async void ExecuteJavaScript()
{
var result = await webView.EvaluateScriptAsync("2 + 2");
if (result.Success && result.Result is int)
{
int resultValue = (int)result.Result;
MessageBox.Show("2 + 2 = " + resultValue);
}
}
protected override void OnFormClosing(FormClosingEventArgs e)
{
// Shut down CefSharp
Cef.Shutdown();
base.OnFormClosing(e);
}
}
}
This example will execute the JavaScript code "2 + 2" in the embedded Chromium browser and display the result in a message box. Note that you need to replace "about:blank" with the URL of the web page where you want to execute JavaScript.
Remember to handle exceptions and error cases appropriately when executing JavaScript code in CefSharp.