Can You Dynamically Change Attribute Properties After Assembly Load?

Dynamically Modifying Attribute Properties

Is it possible to alter attribute parameters after an assembly has been loaded? Consider the following class:

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

Despite being a third-party vendor class (prohibiting code modification), you wish to modify the "change me" category name when binding an instance to a property grid.

Solution:

Attribute instance values can be dynamically modified at runtime. Obtain the attribute instance:

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

Modify its public variables:

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

Create another instance to demonstrate the change:

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

Reference: http://www.vsj.co.uk/articles/display.asp?id=713

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