public void SetValuesToStruct(ref RefHelperStruct refHelper, int newInt, string newString)
{
refHelper.Index = newInt;
refHelper.Value = newString;
}
public void ReferenceExample()
{
int initialValue = 0;
string initialString = "Initial_String";
int newInt = 123456;
string newString = "New_String";
int i = initialValue;
string st = initialString;
// #1
SetInt(i, newInt);
Assert.AreEqual(i, initialValue);
SetInt(ref i, newInt);
Assert.AreEqual(i, newInt);
SetString(st, newString);
Assert.AreEqual(st, initialString);
SetString(ref st, newString);
Assert.AreEqual(st, newString);
// #2 Ref is needed when changing values from
var h1 = new RefHelper();
h1.Index = initialValue;
h1.Value = initialString;
SetInt(h1.Index, newInt);
Assert.AreEqual(h1.Index, initialValue);
SetString(h1.Value, newString);
Assert.AreEqual(h1.Value, initialString);
SetInt(ref h1.Index, newInt);
Assert.AreEqual(h1.Index, newInt);
SetString(ref h1.Value, newString);
Assert.AreEqual(h1.Value, newString);
// #3 Ref is not needed when changing values from class that is passed
h1.Index = initialValue;
h1.Value = initialString;
SetValuesToClass(h1, newInt, newString);
Assert.AreEqual(h1.Index, newInt);
Assert.AreEqual(h1.Value, newString);
// #4 Ref is needed when replacing whole class
h1.Index = initialValue;
h1.Value = initialString;
var newHelper = new RefHelper { Index = 666, Value = "This is new!" };
ReplaceClass(h1, newHelper);
Assert.IsFalse(h1 == newHelper);
ReplaceClass(ref h1, newHelper);
Assert.IsTrue(h1 == newHelper);
// #5 Items in list can be replaced without ref
h1 = new RefHelper();
var list = new List<RefHelper> { h1 };
Assert.IsTrue(list[0] == h1);
Assert.IsFalse(h1 == newHelper);
ReplaceItemsInList(list, newHelper);
Assert.IsTrue(list[0] == newHelper);
Assert.IsFalse(h1 == newHelper);
// #6 Struct works same way as a class
var h2 = new RefHelperStruct();
h2.Index = initialValue;
h2.Value = initialString;
SetInt(h2.Index, newInt);
SetString(h2.Value, newString);
SetInt(ref h2.Index, newInt);
SetString(ref h2.Value, newString);
h2.Index = initialValue;
h2.Value = initialString;
SetValuesToStruct(h2, newInt, newString);
SetValuesToStruct(ref h2, newInt, newString);
}