Code Inspection: Convert to lambda expression

Instead of passing an anonymous method to a delegate, or using a statement lambda, you can use a lambda expression. This is true only for methods containing a single statement.

Both lambda expressions and anonymous methods can be used to create anonymous functions but lambda expressions provide a shorter syntax for that. There are some minor differences between using these two notations — use the links in the See Also section below to learn the details.

In the example below, JetBrains Rider suggests assigning a lambda expression to the sum delegate instead of using a longer anonymous method:

            
class MyClass
{
  public static int MyMethod()
  {
    Func<int, int, int> sum =
      delegate(int x, int y)
      {
        return x + y;
      };
    return sum(10, 20);
  }
}


        

            
class MyClass
{
  public static int MyMethod()
  {
    Func<int, int, int> sum =
      (x, y) => x + y;
    return sum(10, 20);
  }
}

        

In the following example, JetBrains Rider suggests converting a statement lambda to a lambda expression:

            
class MyClass1
{
  public static int MyMethod()
  {
    Func<int, int, int> sum =
      (x, y) =>
      {
        return x + y;
      };
    return sum(10, 20);
  }
}

        

            
class MyClass1
{
  public static int MyMethod()
  {
    Func<int, int, int> sum =
      (x, y) => x + y;
    return sum(10, 20);
  }
}

        

Last modified: 08 March 2021