Code Inspection: Member initialized value ignored

If a constructor initializes a field from a parameter, it is not necessary to initialize the field at declaration. In the example below, JetBrains Rider removes the initialization of _contents from its declaration because _contents is assigned a value in the constructor.

Initializing fields within a constructor is preferable for a number of reasons. For example, if there are more than one constructor, it enables you to initialize a field with different values. Generally, in case of complex logic the initialization inside a constructor is recommended.

JetBrains Rider suggests removal of the unnecessary field initializer:

            
public class MyClass
{
    private readonly List<object> _contents = new List<object>();
    public MyClass(List<object> list)
    {
        _contents = list;
        Console.WriteLine(_contents.ToString());
    }
}

        

            
public class MyClass
{
    private readonly List<object> _contents;
    public MyClass(List<object> list)
    {
        _contents = list;
        Console.WriteLine(_contents.ToString());
    }
}

        

Last modified: 08 March 2021