how to add property to anonymous class?

Question

how to add class to dynamic/anonymous class?

I have object Value I do not know what class it is and can add property to it?

object is { Status = 1 ,Value ="x" }

can become? {Status =1 ,Value="x", Code=-1 }？？

Answer 1

Hi @mc

You can try to create a ExpandoObject to add the property. Check the following code:

        [HttpGet]
        public IActionResult Get()
        {
            var data = new { Status = 1, Value = "x" };
             
            //define a dictionary to store the property and the value.
            Dictionary<string, object> dic = new Dictionary<string, object>();
            //find original property from the anonymous class.
            foreach (var pro in data.GetType().GetProperties())
            {
                dic.Add(pro.Name, pro.GetValue(data, null).ToString());
            }
            //create a ExpandoObject
            var eo = new ExpandoObject();
            var eoColl = (ICollection<KeyValuePair<string, object>>)eo;
            //add the property and value into the expandoObject.
            foreach (var kvp in dic)
            {
                eoColl.Add(kvp);
            }
            //add new property.
            eoColl.Add(new KeyValuePair<string, object>("Code", "111"));

            dynamic result = eoColl;
            var testdata = result.Code;

            return Ok(result);
        }

The result as below:

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Dillion

Answer 2

For example, new { t.Status, t.Value, Code = -1 }, where t is your object.