Inline Parameter refactoring

This refactoring allows you to replace a method parameter with argument value from a method call. If there are several calls, you can choose the call to take the argument from.

A simple case. Inlining a constant value of the parameter pi:

private double AreaOfCircle(double rad, double pi)
{
  return pi*rad*rad;
}
public void Test()
{
  var area = AreaOfCircle(10, Math.PI);
}

private double AreaOfCircle(double rad)
{
  return Math.PI*rad*rad;
}
public void Test()
{
  var area = AreaOfCircle(10);
}

If the argument that you want to be inlined depends on other variables and/or calculations, ReSharper can replace the original parameter with other parameter(s) and move the calculations inside the target method.

In the following example, we apply the refactoring to the action parameter of the PerformAction method so that the whole lambda, which was used as an argument in the call moves into the method body, and two new parameters are created to pass necessary values:

private void PerformAction(Action action)
{
  action();
}
private void Test(string key, string value)
{
  PerformAction(() => Console.WriteLine("{0} : {1}", key, value));
}

private void PerformAction(string arg0, string value)
{
  ((Action) (() => Console.WriteLine("{0} : {1}", arg0, value)))();
}
private void Test(string key, string value)
{
  PerformAction(key, value);
}

tip

The reverse functionality is available with the Introduce Parameter refactoring refactoring.

This feature is supported in the following languages and technologies:

The instructions and examples given here address the use of the feature in C#. For details specific to other languages, see corresponding topics in the ReSharper by language section.