Overriding the Defaults in a struct (c#)

Question

Is it possible to set or override the default state for a structure?

As an example I have an

enum something{a,b,c,d,e};

and a struc

Answer 1

Struct constructors are similar to class constructors, except for the following differences:

Structs cannot contain explicit parameterless constructors. Struct members are automatically initialized to their default values. A struct cannot have an initializer in the form: base (argument-list).

http://msdn.microsoft.com/en-us/library/aa288208(v=vs.71).aspx

So, short answer, no you can't override the default constructor (every struct has a parameterless constructor and you can't hide it or override it)...

Answer 2

Kinda dumb, but works

public readonly static float default_value = 1;
public struct YourStruct{

    public float yourValue{
        get {
            return _yourValue + default_value;
        }
        set {
            _yourValue= value - default_value;
        }
    }
    public float _yourValue;
}

Answer 3

You can't override the default (parameterless) constructor for a struct. You can only add new constructors, which take parameters.

http://csharp.2000things.com/2010/10/03/108-defining-a-constructor-for-a-struct/

Answer 4

Each time you get/set property you need to set default value call InitDefaultValues() method

private string _numberDecimalSeparator;
public string NumberDecimalSeparator
{
    get
    {
        InitDefaultValues();
        return _numberDecimalSeparator;
    }
    set
    {
        InitDefaultValues(); 
        _numberDecimalSeparator = value;
    }
}

...

private void InitDefaultValues()
{
    if (!_inited)
    {
        _inited = false;
        var ci = CultureInfo.CurrentCulture;
         _numberDecimalSeparator = ci.With(x => x.NumberFormat).Return(x => x.NumberDecimalSeparator, ".");

        ...
    }
}

Answer 5

There is a workaround

public struct MyStruct
{
    public MyStruct(int h = 1, int l = 1)
    {
        high = h;
        low = l;
    }
    public int high;
    public int low;
}

Answer 6

this should work

public struct MyStruct 
{
    private string myName;
    private int? myNumber;
    private bool? myBoolean;
    private MyRefType myType;

    public string MyName
    {
        get { return myName ?? "Default name"; }
        set { myName= value; }
    }
    public int MyNumber
    {
        get { return myNumber ?? 42; }
        set { myNumber = value; }
    }
    public bool MyBoolean
    {
        get { return myBoolean ?? true; }
        set { myBoolean = value; }
    }
    public MyRefType MyType 
    {
        get { return myType ?? new MyRefType(); }
        set { myType = value; }
    }

    //optional
    public MyStruct(string myName = "Default name", int myNumber = 42, bool myBoolean = true)
    {
        this.myType = new MyRefType();
        this.myName = myName;
        this.myNumber = myNumber;
        this.myBoolean = myBoolean;
    }
}

---

[TestClass]
public class MyStructTest
{
    [TestMethod]
    public void TestMyStruct()
    {
        var myStruct = default(MyStruct);
        Assert.AreEqual("Default name", myStruct.MyName);
        Assert.AreEqual(42, myStruct.MyNumber);
        Assert.AreEqual(true, myStruct.MyBoolean);
        Assert.IsNotNull(myStruct.MyType);
    }
}