Attribute.GetCustomAttributes Method (ParameterInfo)

public static Attribute[] GetCustomAttributes (
	ParameterInfo element
)

public static Attribute[] GetCustomAttributes (
	ParameterInfo element
)

public static function GetCustomAttributes (
	element : ParameterInfo
) : Attribute[]

Not applicable.

using System;
using System.Reflection;
using System.ComponentModel;

namespace CustAttrs5CS {
    public class AClass {
        public void ParamArrayAndDesc(
            // Add ParamArray (with the keyword) and Description attributes.
            [Description("This argument is a ParamArray")]
            params int[] args)
        {}
    }

    class DemoClass {
        static void Main(string[] args) {
            // Get the Class type to access its metadata.
            Type clsType = typeof(AClass);
            // Get the type information for the method.
            MethodInfo mInfo = clsType.GetMethod("ParamArrayAndDesc");
            if (mInfo != null) {
                // Get the parameter information.
                ParameterInfo[] pInfo = mInfo.GetParameters();
                if (pInfo != null) {
                    // Iterate through all the attributes for the parameter.
                    foreach(Attribute attr in 
                        Attribute.GetCustomAttributes(pInfo[0])) {
                        // Check for the ParamArray attribute.
                        if (attr.GetType() == typeof(ParamArrayAttribute))
                            Console.WriteLine("Parameter {0} for method {1} " +
                                "has the ParamArray attribute.",
                                pInfo[0].Name, mInfo.Name);
                        // Check for the Description attribute.
                        else if (attr.GetType() == 
                            typeof(DescriptionAttribute)) {
                            Console.WriteLine("Parameter {0} for method {1} " +
                                "has a description attribute.",
                                pInfo[0].Name, mInfo.Name);
                            Console.WriteLine("The description is: \"{0}\"",
                                ((DescriptionAttribute)attr).Description);
                        }
                    }
                }
            }
        }
    }
}

/*
 * Output:
 * Parameter args for method ParamArrayAndDesc has a description attribute.
 * The description is: "This argument is a ParamArray"
 * Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
 */

package CustAttrs5JSL; 
import System.*;
import System.Reflection.*;
import System.ComponentModel.*;

public class AClass
{
    public void ParamArrayAndDesc(
        // Add ParamArray (with the keyword) and Description attributes.
        /** @attribute Description("This argument is a ParamArray")
         */
        /** @attribute System.ParamArray() 
         */
        int args[])
    {
    } //ParamArrayAndDesc
} //AClass

class DemoClass
{
    public static void main(String[] args)
    {
        // Get the Class type to access its metadata.
        Type clsType = AClass.class.ToType();

        // Get the type information for the method.
        MethodInfo mInfo = clsType.GetMethod("ParamArrayAndDesc");
        if (mInfo != null) {
            // Get the parameter information.
            ParameterInfo pInfo[] = mInfo.GetParameters();
            if (pInfo != null) {
                // Iterate through all the attributes for the parameter.
                for (int iCtr = 0; iCtr < Attribute.GetCustomAttributes(
                    pInfo[0]).get_Length(); iCtr++) {
                    Attribute attr = (Attribute)Attribute.
                        GetCustomAttributes(pInfo[0]).get_Item(iCtr);
                    // Check for the ParamArray attribute.
                    if (attr.GetType().Equals(ParamArrayAttribute.class.
                        ToType())) {
                        Console.WriteLine("Parameter {0} for method {1} " 
                            + "has the ParamArray attribute.",
                            pInfo[0].get_Name(), mInfo.get_Name());
                    }
                    // Check for the Description attribute.
                    else {
                        if (attr.GetType().Equals(DescriptionAttribute.class.
                            ToType())) {
                            Console.WriteLine("Parameter {0} for method {1} " 
                                + "has a description attribute.", 
                                pInfo[0].get_Name(),mInfo.get_Name());
                            Console.WriteLine("The description is: \"{0}\"",
                                ((DescriptionAttribute)(attr)).
                                get_Description());
                        }
                    }
                }
            }
        }
    } //main
} //DemoClass   

/*
    Output:
    Parameter args for method ParamArrayAndDesc has a description attribute.
    The description is: "This argument is a ParamArray"
    Parameter args for method ParamArrayAndDesc has the ParamArray attribute.
*/