c# - Call .Net from javascript in CefSharp 1 - wpf

Question

I'm just learning C# WPF and has been successfully implemented CefSharp, how to call .NET function from javascript, that is loaded in CefSharp?

Answer 1

Due to Chromium changes starting with 63.0.0 there are major changes Javascript Binding. The legacy behavior still works for Single Page Applications and where only a single domain is used.

New Binding Method

The new binding method has many advantages:

• Bind and unbind objects by name
• Bind a subset of objects to different pages (including popups)
• Delete/unbind a method
• Resolve a bound object dynamically

Simple example:

public class BoundObject {
    public void showMessage(string msg) {
        MessageBox.Show(msg);
    }
}

browser.JavascriptObjectRepository.Register("boundAsync", new BoundObject(), true);

---

<script type="text/javascript">
    (async function() {
        await CefSharp.BindObjectAsync("boundAsync", "bound");

        boundAsync.showMessage('Message from JS');
    })();
</script>

For more details visit Javascript Binding v2 #2246 and How do you expose a .NET class to JavaScript?

Legacy Binding

If you perform cross-site navigation's you will no longer be able to use this method to bind objects.

You need to set CefSharpSettings.LegacyJavascriptBindingEnabled = true before you register your first object (RegisterAsyncJsObject).

Simple example:

public class BoundObject {
    public void showMessage(string msg) {
        MessageBox.Show(msg);
    }
}

CefSharpSettings.LegacyJavascriptBindingEnabled = true;
browser.RegisterAsyncJsObject("boundAsync", new BoundAsyncObject());

---

<script type="text/javascript">
    boundAsync.showMessage('Message from JS');
</script>

For more details visit Javascript Binding v2 #2246 and How do you expose a .NET class to JavaScript?