MSIE

JavaScriptEngineSwitcher.Msie contains a MsieJsEngine adapter (wrapper for the MSIE JavaScript Engine for .NET).

For correct working of the MSIE JavaScript Engine it is recommended to install Internet Explorer 9+ or Microsoft Edge Legacy on the machine.

Engine settings

You can specify a settings of JS engine during its registration:

engineSwitcher.EngineFactories
    .AddMsie(new MsieSettings
    {
        EngineMode = JsEngineMode.ChakraIeJsRt
    })
    ;

If you manually create an instance of JS engine, then you can pass settings via the constructor:

IJsEngine engine = new MsieJsEngine(
    new MsieSettings
    {
        EngineMode = JsEngineMode.ChakraIeJsRt
    }
);

Consider in detail properties of the MsieSettings class:

Property name	Data type	Default value	Description
AllowReflection	Boolean	false	Flag for whether to allow the usage of reflection API in the script code. This affects Object.GetType, Exception.GetType, Exception.TargetSite and Delegate.Method.
EnableDebugging	Boolean	false	Flag for whether to allow debugging in Visual Studio by adding the debugger statement to script code.
EngineMode	JsEngineMode enumeration	Auto	JS engine mode. Can take the following values: Auto. Automatically selects the most modern JavaScript engine from available on the machine. Classic. Classic MSIE JavaScript engine (supports ECMAScript 3 with possibility of using the ECMAScript 5 Polyfill and the JSON2 library). Requires Internet Explorer 6 or higher on the machine. Not supported in version for .NET Core. ChakraActiveScript. ActiveScript version of Chakra JavaScript engine (supports ECMAScript 5). Requires Internet Explorer 9 or higher on the machine. Not supported in version for .NET Core. ChakraIeJsRt. “IE” JsRT version of Chakra JavaScript engine (supports ECMAScript 5). Requires Internet Explorer 11 or Microsoft Edge Legacy on the machine. ChakraEdgeJsRt. “Edge” JsRT version of Chakra JavaScript engine (supports ECMAScript 5). Requires Microsoft Edge Legacy on the machine.
MaxStackSize	Int32	503 808 or 1 007 616	Maximum stack size in bytes. Set a 0 to use the default maximum stack size specified in the header for the executable. Not supported in version for .NET Core 1.X.
UseEcmaScript5Polyfill	Boolean	false	Flag for whether to use the ECMAScript 5 Polyfill.
UseJson2Library	Boolean	false	Flag for whether to use the JSON2 library

Debugging

MSIE JavaScript Engine for .NET has support of the debugging in Visual Studio 2010-2012. In addition, debuggable script must contain a debugger statement (see MSDN for more details).

Here are steps, that you need to do for start of debugging:

1. Switch the solution in debug mode.

2. Set the EnableDebugging property of the MsieSettings class to true.

3. Add the debugger statements in debuggable script code.

4. Click on the Start button.

5. In opened the Visual Studio Just-In-Time Debugger window select the New instance of Microsoft Visual Studio 2012 item:

   

6. In the Visual Studio debugger window open the script block(s) and set breakpoint(s):

   

7. Return to the main Visual Studio window and click on the Continue button.