Can You Modify .NET Runtime Attributes Dynamically?

Runtime Attribute Customization

In development, situations arise where attributes need to be modified during runtime, despite limitations imposed by third-party vendors. Considering a class with attributes like:

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

Modifying Instances at Runtime

Contrary to perceptions, attribute instances can be modified at runtime. By obtaining the attribute instances, we can make value modifications like:

ASCII[] attrs1 = (ASCII[])
    typeof(MyClass).GetCustomAttributes(typeof(ASCII), false);
attrs1[0].MyData = "A New String";
MessageBox.Show(attrs1[0].MyData);

Preserving Unchanged Attribute Values

It's essential to note that subsequent invocations to retrieve attribute instances will not be affected by the runtime modification:

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

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