Reflection : Object reference not set to an instance of an object

Question

I try to call a method using reflection. My object :

public class CurrentSearch
{
    public string currentUniverse { get; set; }
    public string currentApplication;
    public string currentUsage;
...

My code :

CurrentSearch cS = SessionUtils.getCS();
cS.currentUniverse = "lol";         
string methodName = "currentUniverse" ;
var test = typeof(CurrentSearch).GetMethod(methodName).Invoke(cS, null);

But i get the error "Object reference not set to an instance of an object." on the last line. I've checked cS, it's not null... What's wrong? Thx

You need to use GetProperty, not GetMethod.

RB.
– RB.

2016-01-12 16:34:04 +00:00
Commented Jan 12, 2016 at 16:34 — RB.
– RB., Commented Jan 12, 2016 at 16:34
What is a NullReferenceException and how do I fix it?

Soner Gönül
– Soner Gönül

2016-01-12 16:37:21 +00:00
Commented Jan 12, 2016 at 16:37 — Soner Gönül
– Soner Gönül, Commented Jan 12, 2016 at 16:37

RB. · Accepted Answer · 2016-01-12 16:35:43Z

1

currentUniverse is a property, so you need to use GetProperty, not GetMethod.

void Main()
{
    CurrentSearch cs = new CurrentSearch();
    cs.currentUniverse = "lol";         
    string methodName = "currentUniverse" ;
    Console.WriteLine(typeof(CurrentSearch).GetProperty(methodName).GetValue(cs));
                                            ^^^^^^^^^^^
}

public class CurrentSearch
{
    public string currentUniverse { get; set; }
    public string currentApplication;
    public string currentUsage;
}

answered Jan 12, 2016 at 16:35

RB.

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1 Comment

Lempkin Over a year ago

Oh yes that was pretty obvious ^^ Thx

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