Using reflection modify List<int> type class member...</int> [modified]

chandrap

Hi I am trying to modify class instance members using reflection. I am having problem when trying to add/remove/display elements related to List member. Following is the code. [CODE]

class TestClass
{
    public int i = 0;

    public int IValue
    {
        get
        {
            return i;
        }
        set
        {
            i = value;
        }

    }
    public List m\_intList = new List();
}
class Program
{
    static void Main(string\[\] args)
    {
        TestClass tcObject = new TestClass();
        tcObject.i = 1;
        tcObject.m\_intList.Add(1);
        tcObject.m\_intList.Add(2);

        // Following code modifies the field "I".
        {
            FieldInfo fieldInfo = tcObject.GetType().
                                    GetField(
                                    "i",
                                    BindingFlags.Static |
                                    BindingFlags.Instance |
                                    BindingFlags.NonPublic |
                                    BindingFlags.Public);

            fieldInfo.SetValue(tcObject, 2);

            System.Console.WriteLine("I value '{0}'", fieldInfo.GetValue(tcObject));
        }

        // Following code modifies the IValue property.
        {
            PropertyInfo propertyInfo = tcObject.GetType().
                                    GetProperty(
                                    "IValue",
                                    BindingFlags.Static |
                                BindingFlags.Instance |
                                BindingFlags.NonPublic |
                                BindingFlags.Public);

            MethodInfo propertySetMethodInfo =
                            propertyInfo.GetSetMethod(true);

            propertySetMethodInfo.Invoke(tcObject, new Object\[\] { 3 });

            System.Console.WriteLine("Property IValue '{0}'", tcObject.i);
        }

        // Following is the actual problem I am having. I would like to add
        // elements to the List member m\_intList.
        {
            FieldInfo fieldInfo = tcObject.GetType().
                                    GetField(
                                    "m\_intList",
                                    BindingFl

chandrap

At compile time I do not know whether the type is List or List. At runtime I should interpret it from the fieldInfo.FieldType.

chandrap

I even tried the following code

            MethodInfo addMethodInfo = fieldInfo.FieldType.GetMethod("Add"); 
            object\[\] intValue = { 5 }; 
            addMethodInfo.Invoke(tcObject, new Object\[\] { 5 });

But the above code gives me error "Unhandled Exception: System.Reflection.TargetException: Object does not match target type." when executing the "invoke"

led mike

chandrap wrote:

I am trying to modify class instance members using reflection.

Why?

led mike

chandrap

Its a requirement in my application. Given an instance of class and values for the members, we should be able to update the members with the corresponding values.

led mike

chandrap wrote:

Given an instance of class and values for the members, we should be able to update the members with the corresponding values.

Where in there is the requirement to use Reflection?

led mike

chandrap

Hello everyone, thanks for your help. I was able to find the solution for my requirement. Following is the code

class ListElement
{
    public ListElement()
    {
        m\_element = 0;
    }

    public ListElement(int element)
    {
        m\_element = 1;
    }

    public int m\_element;
}

class TestClass
{
    public int i = 0;

    public int IValue
    {
        get
        {
            return i;
        }
        set
        {
            i = value;
        }

    }
    public List m\_intList = new List();
    public List m\_lstElement = new List();
}
class Program
{
    static void Main(string\[\] args)
    {
        TestClass tcObject = new TestClass();
        tcObject.i = 1;
        tcObject.m\_intList.Add(1);
        tcObject.m\_intList.Add(2);
        tcObject.m\_lstElement.Add(new ListElement(1));

        // Following code modifies the field "I".
        {
            FieldInfo fieldInfo = tcObject.GetType().
                                    GetField(
                                    "i",
                                    BindingFlags.Static |
                                    BindingFlags.Instance |
                                    BindingFlags.NonPublic |
                                    BindingFlags.Public);

            fieldInfo.SetValue(tcObject, 2);

            System.Console.WriteLine("I value '{0}'", fieldInfo.GetValue(tcObject));
        }

        // Following code modifies the IValue property.
        {
            PropertyInfo propertyInfo = tcObject.GetType().
                                    GetProperty(
                                    "IValue",
                                    BindingFlags.Static |
                                BindingFlags.Instance |
                                BindingFlags.NonPublic |
                                BindingFlags.Public);

            MethodInfo propertySetMethodInfo =
                            propertyInfo.GetSetMethod(true);

            propertySetMethodInfo.Invoke(tcObject, new Object\[\] { 3 });

            System.Console.WriteLine("Property IValue '{0}'", tcObject.i);
        }

        {
            FieldInfo fieldInfo = tcObject.GetType