How to remove all null items inside a shared list at a time?

Question

Is there a default method defined in .Net for C # to remove all items in a list that are null ?

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

Let's say some of the parameters are null ; I cannot know in advance, and I want to remove them from my list so that it contains only parameters that are not null.

Answer 1

You will probably need the following.

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

Answer 2

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

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

Answer 3

The RemoveAll method should do the trick:

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

Answer 4

 List<EmailParameterClass> parameterList = new List<EmailParameterClass>{param1, param2, param3...}; parameterList = parameterList.Where(param => param != null).ToList(); 

Answer 5

The OfType() method will skip null values:

 List<EmailParameterClass> parameterList = new List<EmailParameterClass>{param1, param2, param3...}; IList<EmailParameterClass> parameterList_notnull = parameterList.OfType<EmailParameterClass>(); 

Answer 6

Easy and without LINQ:

 while (parameterList.Remove(null)) {};