How can I make a property "Write Once Read Many" in VB.NET?
What is the best way to make a class property "Write Once, Read Many" such that you can only set the property once?
I know that I could pass all the properties in the constructor and make them ReadOnly, but in cases with a lot of properties I don't want a constructor that has 20+ arguments.
Also, I realize I can "roll my own" setters, but having to do that for every property seems like a bunch of redundant coding.
Is there a clean way to do this in VB 2008 .NET 3.5?
A Write Once Property is never "clean".
I'd recommend to create a builder/factory class to avoid the 20 param CTor. (Yes, I know it is quite some typing)
Similar discussion here: Should I use set once variables?
[edit] Furthermore, even if you insist I don't see another option than rolling your own setters, which is a lot of typing, too.
我知道已经差不多3年了，但这是我认为更好的解决方案：
public class Site
{
private int miID;
public Site(int iNewID, string sName)
{
miID = iNewID;
Name = sName;
}
// The ID property can only be set once in the constructor
public int ID
{
get { return miID; }
}
public string Name { get; set; }
}
The "cleanest" way would be not to do it at all and use auto properties. I fail to see the need for it too. Is it really that important that they can only be written once? If so I would definitely go with a constructor that takes values for all the properties as parameters.
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