[c#] Check if a property exists in a class

I try to know if a property exist in a class, I tried this :

public static bool HasProperty(this object obj, string propertyName)
{
    return obj.GetType().GetProperty(propertyName) != null;
}

I don't understand why the first test method does not pass ?

[TestMethod]
public void Test_HasProperty_True()
{
    var res = typeof(MyClass).HasProperty("Label");
    Assert.IsTrue(res);
}

[TestMethod]
public void Test_HasProperty_False()
{
    var res = typeof(MyClass).HasProperty("Lab");
    Assert.IsFalse(res);
}

I'm unsure of the context on why this was needed, so this may not return enough information for you but this is what I was able to do:

if(typeof(ModelName).GetProperty("Name of Property") != null)
{
//whatevver you were wanting to do.
}

In my case I'm running through properties from a form submission and also have default values to use if the entry is left blank - so I needed to know if the there was a value to use - I prefixed all my default values in the model with Default so all I needed to do is check if there was a property that started with that.

There are 2 possibilities.

You really don't have Label property.

You need to call appropriate GetProperty overload and pass the correct binding flags, e.g. BindingFlags.Public | BindingFlags.Instance

If your property is not public, you will need to use BindingFlags.NonPublic or some other combination of flags which fits your use case. Read the referenced API docs to find the details.

EDIT:

ooops, just noticed you call GetProperty on typeof(MyClass). typeof(MyClass) is Type which for sure has no Label property.

I got this error: "Type does not contain a definition for GetProperty" when tying the accepted answer.

This is what i ended up with:

using System.Reflection;

if (productModel.GetType().GetTypeInfo().GetDeclaredProperty(propertyName) != null)
{

}

This answers a different question:

If trying to figure out if an OBJECT (not class) has a property,

OBJECT.GetType().GetProperty("PROPERTY") != null

returns true if (but not only if) the property exists.

In my case, I was in an ASP.NET MVC Partial View and wanted to render something if either the property did not exist, or the property (boolean) was true.

@if ((Model.GetType().GetProperty("AddTimeoffBlackouts") == null) ||
        Model.AddTimeoffBlackouts)

helped me here.

Edit: Nowadays, it's probably smart to use the nameof operator instead of the stringified property name.

If you are binding like I was:

<%# Container.DataItem.GetType().GetProperty("Property1") != null ? DataBinder.Eval(Container.DataItem, "Property1") : DataBinder.Eval(Container.DataItem, "Property2")  %>