Invoke JavaScript function from JSFunction object. In some cases, from the browser JavaScript side, try using the C# JavaScript function with function type argument, such as: RegisterJSFunction("csharpExecCallback", callback => InvokeJSFunctionAsync(callback, "TestResult")); Thus, the browser javascript side can call: window.csharpExecCallback(function(result) { console.log(result); });

'Declaration
 
Public Function InvokeJSFunctionAsync( _
   ByVal jsFunctionInstance As Object, _
   ByVal ParamArray arguments() As Object _
) As Task(Of Object)

'Usage
 
Dim instance As WebControl
Dim jsFunctionInstance As Object
Dim arguments() As Object
Dim value As Task(Of Object)
 
value = instance.InvokeJSFunctionAsync(jsFunctionInstance, arguments)

public Task<object> InvokeJSFunctionAsync( 
   object jsFunctionInstance,
   params object[] arguments
)

public:
Task<Object^>^ InvokeJSFunctionAsync( 
   Object^ jsFunctionInstance,
   ... array<Object^>^ arguments
)