How Can I Dynamically Change Attribute Parameter Values at Runtime in C#?

Dynamic Modification of Attribute Parameters

In certain scenarios, it may be necessary to adjust attribute parameters during runtime to provide more accurate or customized information. Consider the following example:

public class UserInfo
{
    [Category("change me!")]
    public int Age
    {
        get;
        set;
    }
    [Category("change me!")]
    public string Name
    {
        get;
        set;
    }
}

Let's say you have a third-party class like the one above and cannot modify its code. However, you discover that the "change me!" category name is inaccurate and wish to update it dynamically.

Fortunately, you can modify attribute instance values at runtime by accessing the attribute objects directly through reflection.

Here's how:

1. Retrieve the attribute instances:

ASCII[] attrs1 = (ASCII[])typeof(MyClass).GetCustomAttributes(typeof(ASCII), false);

2. Modify the public variable of the attribute instance:

attrs1[0].MyData = "A New String";

3. Display the changed value:

MessageBox.Show(attrs1[0].MyData);

4. Create another instance to confirm the change is local:

ASCII[] attrs3 = (ASCII[])typeof(MyClass).GetCustomAttributes(typeof(ASCII), false);
MessageBox.Show(attrs3[0].MyData);

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