(.NET Core C#) Enable Chilkat Classes in JavaScript

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Note: This example requires Chilkat v11.4.0 or greater.

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bool success = false;

// Chilkat classes within JavaScript are disabled by default.
// An attempt to instantiate a disabled Chilkat class results in a JavaScript exception.

// For example, try the following JavaScript without first enabling the Chilkat class:

// sb = new CkStringBuilder();
// sb.Append('Hello World');
// success = sb.WriteFile('c:/aaworkarea/helloWorld.txt','utf-8',true);

Chilkat.StringBuilder sbJavaScript = new Chilkat.StringBuilder();
sbJavaScript.Append("sb = new CkStringBuilder(); sb.Append('Hello World'); success = sb.WriteFile('c:/aaworkarea/helloWorld.txt','utf-8',true);");

Chilkat.Js js = new Chilkat.Js();

Chilkat.JsonObject result = new Chilkat.JsonObject();
result.EmitCompact = false;

// Run the script.  This should result in an error because we haven't enabled the Chilkat CkStringBuilder class.
success = js.Eval(sbJavaScript,result);
if (success == false) {
    // Examine the result for an exception.
    Debug.WriteLine(result.Emit());

    // The result contains this:
    // {
    //   "exception": {
    //     "message": "Cannot create the chilkat object because the chilkat class is disabled in JavaScript. Fix by calling SetCkPermission before calling Eval or CallFunction",
    //     "stack": [
    //       {
    //         "func": "CkStringBuilder"
    //       },
    //       {
    //         "func": "<eval>",
    //         "file": "<input>",
    //         "line": 1,
    //         "col": 9
    //       }
    //     ]
    //   }
    // }

}

// Enable the Chilkat CkStringBuilder JavaScript class for readWrite
js.SetCkPermission("CkStringBuilder","readWrite");
// The script should work now...
success = js.Eval(sbJavaScript,result);
Debug.WriteLine("success = " + Convert.ToString(success));

// If the CkStringBuilder class is enabled for readOnly or sandbox, then it will fail.
//   - Chilkat methods that could directly or indirectly write to the filesystem require writeOnly or readWrite access.
//   - Chilkat methods that read the local filesystem require readOnly or readWrite access.
//   - Chilkat methods that don't interact with the local filesystem work in any mode including sandbox.
js.SetCkPermission("CkStringBuilder","readOnly");
success = js.Eval(sbJavaScript,result);
if (success == false) {
    // Examine the result for an exception.
    Debug.WriteLine(result.Emit());

    // {
    //   "exception": {
    //     "message": "failed because this Chilkat method requires the writeOnly or readWrite permission",
    //     "stack": [
    //       {
    //         "func": "WriteFile"
    //       },
    //       {
    //         "func": "<eval>",
    //         "file": "<input>",
    //         "line": 1,
    //         "col": 67
    //       }
    //     ]
    //   }
    // }
}