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Why should I use ref for structs?
Is there a practical reason to use ref for structs in C#?
In case your struct has some fields that are mutable (and you want to change them through code), you need to use ref or you'll have a compile error.
There are a few cases where you need to use ref in a struct to explicitly pass it by reference.
void AddOrUpdate(ref MyStruct s)
s = new MyStruct();
can lead to a NullReferenceException at the call of AddOrUpdate if you pass it a struct that hasn't been initialised.
Even though I don't know if there is a practical reason to use ref for structs there is at least a reason for them - C# is statically typed, so it has no reason to use ref if not necessary and if you use ref it at least shows the intention to do so.
If you are setting a value of a struct, then the most efficient way is to use ref.
For example, suppose I create a variable named foo with a value of type Bar: