How Can I Dynamically Modify Attribute Parameters at Runtime?

Modifying Attribute Parameters Dynamically

In certain scenarios, you may encounter a situation where you need to modify the parameters of an attribute at runtime. Typically, attributes are static and cannot be changed after they are applied to a class or property. However, there is a way to achieve this functionality by manipulating the attribute instance itself.

Consider the following UserInfo class provided by a third-party vendor:

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

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

Despite the intention of modifying these categories, you are unable to do so directly due to vendor limitations. To circumvent this issue, you can use the following technique:

1. Retrieve the Attribute Instance:

CategoryAttribute[] attrs = (CategoryAttribute[]) typeof(UserInfo)</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">.GetProperty("Age").GetCustomAttributes(typeof(CategoryAttribute), false);

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2. Modify the Parameter:

attrs[0].Category = "My New Category";

3. Inspect the Changes:

Console.WriteLine(attrs[0].Category); // Outputs "My New Category"

By manipulating the attribute instance directly, you can dynamically change the value of its parameter at runtime. This allows you to modify the category names of the UserInfo class without modifying the original code provided by the vendor.

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