How to remove all the Null elements inside a generic List in one go?

Question

Hi,

Is there a default method defined in .Net for C# to remove all the elements within a list which are NULL?

List<EmailParameterClass> parameterList = new List<EmailParameterClass>{param1, param2, param3...};

Lets say some of the paramters are NULL; I cannot know in advance and I want to remove them from my list so that it only contains parameters which are not null.

Answer 1

You'll probably want the following.

List<EmailParameterClass> parameterList = new List<EmailParameterClass>{param1, param2, param3...};
parameterList.RemoveAll(item => item == null);

Answer 2

The RemoveAll method should do the trick:

parameterList.RemoveAll(delegate (object o) { return o == null; });

Answer 3

I do not know of any in-built method, but you could just use linq:

parameterList = parameterList.Where(x => x != null).ToList();

Answer 4

List<EmailParameterClass> parameterList = new List<EmailParameterClass>{param1, param2, param3...};

parameterList = parameterList.Where(param => param != null).ToList();