[英]C# - Enforce Child Object Immutability in Struct
I am trying to create an immutable struct.我正在尝试创建一个不可变的结构。 The problem is, it contains mutable objects inside.
问题是,它里面包含可变对象。 Is it possible to make those immutable (without modifying their class)?
是否可以使那些不可变(不修改它们的类)? For example ( https://dotnetfiddle.net/KTiTzB ):
例如( https://dotnetfiddle.net/KTiTzB ):
public class IntHolder
{
public int X
{
get;
set;
}
}
public struct ImmutableStruct
{
public int ImmutableInt
{
get;
private set;
}
public IntHolder MyIntHolder
{
get;
private set;
}
public ImmutableStruct(int immutableInt, IntHolder myIntHolder): this ()
{
ImmutableInt = immutableInt;
MyIntHolder = myIntHolder;
}
}
public class Program
{
public static void Main()
{
Console.WriteLine("Immutability");
IntHolder intHolder = new IntHolder();
intHolder.X = 40;
Console.WriteLine(intHolder.X == 40); // TRUE
ImmutableStruct immStruct = new ImmutableStruct(10, intHolder);
Console.WriteLine(immStruct.ImmutableInt == 10); // TRUE
// immStruct.ImmutableInt = 4; // THIS DOESN'T WORK, AS EXPECTED. Hurray!
// immStruct.MyIntHolder = new IntHolder(3); // ALSO DOESN'T WORK, GOOD!
immStruct.MyIntHolder.X = 4; // how can I prevent this from working?
}
}
Is there a way to make the IntHolder member immutable while leaving the IntHolder class unmodified?有没有办法在不修改 IntHolder 类的同时使 IntHolder 成员不可变?
It's actually a big question: how to handle nested objects in immutable data?这实际上是一个大问题:如何处理不可变数据中的嵌套对象?
https://softwareengineering.stackexchange.com/questions/279580/how-to-make-complex-objects-immutable https://softwareengineering.stackexchange.com/questions/279580/how-to-make-complex-objects-immutable
https://medium.freecodecamp.org/handling-state-in-react-four-immutable-approaches-to-consider-d1f5c00249d5 https://medium.freecodecamp.org/handling-state-in-react-four-immutable-approaches-to-think-d1f5c00249d5
https://redux.js.org/recipes/structuringreducers/immutableupdatepatterns https://redux.js.org/recipes/structuringreducers/immutableupdatepatterns
In my opinion, It's worthy to create immutable children models to make sure the whole object immutable.在我看来,创建不可变的子模型以确保整个对象不可变是值得的。
See comments in code below:请参阅以下代码中的注释:
public class IntHolder
{
public int X
{
get;
set;
}
public ImmutableIntHolder ToImmutable()//convert itself to ImmutableIntHolder
{
return new ImmutableIntHolder(X);
}
}
public class ImmutableIntHolder
{
public ImmutableIntHolder(int x)
{
X = x;
}
public int X
{
get;
private set;
}
public IntHolder ToIntHolder() //convert it back to mutable IntHolder
{
return new IntHolder()
{
X = this.X
};
}
}
public struct ImmutableStruct
{
public int ImmutableInt
{
get;
private set;
}
public ImmutableIntHolder IntHolder //use ImmutableIntHolder instead
{
get;
private set;
}
public ImmutableStruct(int immutableInt, IntHolder myIntHolder) : this()
{
ImmutableInt = immutableInt;
IntHolder = myIntHolder.ToImmutable(); // convert to immutable
}
}
another option is:另一种选择是:
public class IntHolder
{
public int X
{
get;
set;
}
}
public class ImmutableStruct //changed to class
{
public int ImmutableInt
{
get;
private set;
}
public ImmutableIntHolder IntHolder
{
get;
private set;
}
public ImmutableStruct(int immutableInt, IntHolder myIntHolder) //: this()
{
ImmutableInt = immutableInt;
IntHolder = new ImmutableIntHolder(myIntHolder); // convert here.
}
public class ImmutableIntHolder
{
public ImmutableIntHolder(IntHolder intHolder)
{
//map all properties
X = intHolder.X;
}
public int X
{
get;
private set;
}
}
}
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