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what is out keyword in C# vs ref

Derrick Brandt answered on February 27, 2023 Popularity 9/10 Helpfulness 5/10

answer what is out keyword in C# vs ref

what is out keyword in C# vs ref

Comment

Every method absorbs specific use cases for pass by memory address: 
"ref" passes the memory address and states the parameter may be modified by the method;
"in" states the parameter passed cannot be modified by the method; 
"out" states the parameter passed must be modified by the method.

Code examples:

static void Enroll(ref Student student)
  {
    // With "ref," all three lines below alter the student variable outside the method.
    student.Enrolled = true;
    student = new Student();
    student.Enrolled = false;
  }

static void Enroll(out Student student)
  {
    //We need to initialize the variable in the method before doing anything.
	//The student variable is altered outside the method.
    student = new Student();
    student.Enrolled = false;
  }

static void Enroll(in Student student)
  {
    // With "in," assigning a new object would throw an error
    // student = new Student();

    // We can still do this with reference types though. Variable altered outside the method. 
    student.Enrolled = true;
  }

Popularity 9/10 Helpfulness 5/10 Language csharp

Source: app.pluralsight.com

Tags: c# keyword out ref

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