Named arguments in C Sharp (C#) - Step-by-Step Execution

Concept Flow - Named arguments

Call method with named arguments

↓

Match argument names to parameters

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Assign values to parameters

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Execute method body with assigned values

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Return result or complete execution

The program calls a method using named arguments, matches names to parameters, assigns values, then runs the method.

Execution Sample

C Sharp (C#)

void Greet(string firstName, string lastName) {
    Console.WriteLine($"Hello, {firstName} {lastName}!");
}

Greet(lastName: "Smith", firstName: "John");

Calls Greet method using named arguments in different order to print a greeting.

Execution Table

Step	Action	Parameter	Value Assigned	Output
1	Call Greet with named arguments	lastName	Smith
2	Call Greet with named arguments	firstName	John
3	Execute method body	firstName	John
3	Execute method body	lastName	Smith
4	Print greeting			Hello, John Smith!
5	Method ends

💡 Method completes after printing greeting with assigned named arguments.

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
firstName	null	null	John	John
lastName	null	Smith	Smith	Smith

Key Moments - 2 Insights

Why can we pass arguments in a different order than the method parameters?

Because named arguments specify which parameter each value belongs to, the order does not matter. See execution_table steps 1 and 2 where values are assigned by name.

What happens if we omit a named argument?

If the parameter has no default value, the compiler will give an error. Named arguments must provide values for all required parameters or rely on defaults.

Visual Quiz - 3 Questions

Look at the execution_table, what value is assigned to 'firstName' at step 2?

A "Smith"

B null

C "John"

D "Hello"

💡 Hint

Check the 'Value Assigned' column at step 2 in execution_table.

At which step does the program print the greeting?

A Step 2

B Step 4

C Step 3

D Step 5

💡 Hint

Look for the 'Output' column showing printed text in execution_table.

If we swapped the named arguments in the call, how would the variable_tracker change?

A No change, values assigned by name

B firstName would be 'Smith' and lastName 'John'

C Both variables would be null

D The program would crash

💡 Hint

Named arguments assign values by parameter name, not position; see variable_tracker.

Concept Snapshot

Named arguments let you specify parameter names when calling methods.
This allows passing arguments in any order.
Syntax: MethodName(paramName: value).
Improves code readability and avoids mistakes.
All required parameters must be assigned or have defaults.

Full Transcript

This example shows how named arguments work in C#. When calling a method, you can specify the parameter names explicitly, like firstName: "John" and lastName: "Smith". This means the order of arguments does not matter. The program matches each argument to the correct parameter by name, assigns the values, then runs the method body. The method prints a greeting using the assigned values. Named arguments help make code clearer and prevent errors from wrong argument order.