#273 – Parameter Modifier Summary

Here’s a summary of the different parameter modifiers and how the behavior changes for each, when using them with value-typed and reference-typed variables.

  • No modifier – value types
    • Copy of value passed to method
    • Method can read value
  • No modifier – reference types
    • Reference to object passed to method
    • Method can read/write object contents
  • ref modifier – value types
    • Reference to variable passed to method
    • Method can read/write variable
  • ref modifier – reference types
    • Reference to object reference passed to method
    • Method can read/write object contents
    • Method can change reference to point to new object
  • out modifier – value types
    • Reference to variable passed to method
    • Method must write new value to variable
  • out modifier – reference types
    • Reference to object reference passed to method
    • Method must change reference to point to new object

About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

One Response to #273 – Parameter Modifier Summary

  1. Mason says:

    Additionally, the “in” modifier was added in C# 7.2, which is by-reference but read-only. https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/in-parameter-modifier

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