I am trying to convert an Object to dynamic type but the conversion is failing with RunTimeBinder exception

Question

I am trying to convert an Object to dynamic type but the conversion is failing with RunTimeBinder exception. I tried using two methods that I came across in Stackoverflow answers.

Code 1:

object objSum;
dynamic dynSum;
objSum = dataTableColumnChart.Compute(String.Format("Count({0})", strColumnName), "");
dynSum = Convert.ChangeType(objSum, objSum.GetType());\
Debug.Writeline(dynSum);

Code 2:

dynSum=objSum;
Debug.Writeline(dynSum);

The exception thrown is this:

A first chance exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' occurred in Unknown Module.

Please note that in both cases exception is thrown when Debug statement is executed.

Answer 1

The exception is:

Cannot dynamically invoke method 'Write' because it has a Conditional attribute

And when you check possible Debug.WriteLine inputs, "dynamic" is not one of them. So you need to cast it, to string for example:

    string strForWriteLine = dynSum.ToString() as string;
    Debug.WriteLine(strForWriteLine);

Hope this helps

*Edit: A little bit detail about dynSum.ToString() as string; When you just use ToString() you still get a dynamic string.

var strForWriteLine = dynSum.ToString();

strForWriteLine's type is dynamic { string }