How can I dynamically create class objects?

I have a class MyClass

:

public class OPCTag
{
    public string tagName;
    public string tagOvationMatch;
    public string tagValue;
}

      

I know how to create an object of a class manually, but how can I dynamically create objects of this class as well? For example, to create it in a loop for

:

for (int i=0; i< 10; i++)
{
    //CREATE OBJECT DYNAMICALLY
}

      

To get 10 MyClass objects after it.

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4 answers


If you mean just instantiating a class always with the same type, this is enough for you:

List<OPCTag> list = new List<OPCTag>();
for (int i = 0; i < 10; i++)
{
    // Create object of OPCTag
    var obj = new OPCTag();

    // Set value for 'tagName' property 
    obj.tagName = "New value of 'tagName'";

    // Get value of 'tagName' property
    var tagNameValue = obj.tagName;

    list.Add(obj);
}

// Set value of 4th element 'tagName' property
list[4].tagName = "This is 4th element";

// Get value of 4th element 'tagName' property
var valueOf4thTag = list[4].tagName;

      



But if you want to dynamically create classes with unknown types, you must use reflection:

// Type namespace and name
string typeName = typeof(OPCTag).FullName; // MyNamespace.OPCTag

List<Object> list = new List<Object>();
for (int i = 0; i < 10; i++)
{
    // Create object dynamically from string type
    var obj = Type.GetType(typeName).GetConstructor(new Type[0]).Invoke(new object[0]);

    // Set value for 'tagName' property
    obj.GetType().GetProperty("tagName").SetValue(obj, "New value for 'tagName'");

    // Get value from 'tagName' property
    string tagNameValue = (string)obj.GetType().GetProperty("tagName").GetValue(obj);

    list.Add(obj);
}

      

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You can add your objects dynamically to the loop, but you need to create a list. You can write something like this:



List<OPCTag> lstTag = new List<OPCTag>();

for(int i = 0; i<10 ; i++)
{
     lstTag.Add(new OPCTag());
}

      

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To create 10 objects MyClass

, you can do for example:

List<MyClass> list = new List<MyClass>();
for (int i = 0; i < 10; i++)
{
    list.Add(new MyClass());    
}

      

Although this is not "dynamic object creation", it is just instantiation.

For, you Dictionary

must specify a key and value. They can be of any type, not just int

(usually string

).

Dictionary<int, MyClass> dictionary = new Dictionary<int, MyClass>();
for (int i = 0; i < 10; i++)
{
    dictionary.Add(i, new MyClass());
}

      

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// Your class

public class OPCTag
{
    public string tagName;
    public string tagOvationMatch;
    public string tagValue;
}

      

// Initialize a new OPCTag list object

List<OPCTag> lstTag = new List<OPCTag>();

for(int i = 0; i<10 ; i++)
{
     lstTag.Add(new OPCTag());
}

      

// To read the value from the lstTag based on the index, here I am specifying the value index / first in the list.

var firstIndexTagname =  lstTag[0].tagName;
var firstIndexTagOvationMatch = lstTag[0].tagOvationMatch;
var firstIndexTagValue =  lstTag[0].tagValue;

      

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