CODEWITHSUNDEEP
c#.net
leddbo
leddbo

Reputation: 33

Dynamically create instance(s) of C# class

I want to dynamically create instances of a class, so I created a dictionary of objects of that class and assign the names by appending a counter to a string. But how do I access the properties of the objects?

The code is something like this:

int count = 0;
string name = "MyInstanceName" + count.ToString();

Dictionary<string, MyClass> d = new Dictionary<string, MyClass>();
d.Add(name, new MyClass(Parameter));

//try to retrieve the Property - this doesn't work
textBox1.Text = d[name.Property];

Upvotes: 3

Views: 1567

Answers (3)

Alberto Monteiro
Alberto Monteiro

Reputation: 6239

You can do this

int count = 0;
string name = "MyInstanceName" + count.ToString();

var d = new Dictionary<string, MyClass>();
d.Add(name, new MyClass());

textBox1.Text = d[name].Property;

You created a Dictionary that the key is a string and the value is a instance of MyClass.

When using Dictionary index, the value between brackets [] should be the key, in this case a string.

myDictionary["keyValue"]

Upvotes: 7

user5758750
user5758750

Reputation:

in addition to Alberto Monteiro's answer, don't forget to cast your object:

textBox1.Text = (myClass) d["MyInstanceName1"].Property;

or

var myInstanceX = d["MyInstanceName1"].Property;
textBox1.Text = myInstanceX.myStringProperty();

In C# (unlike VB), you don't need to specify the type of a variable if the compiler can determine it elsewhere, so you can also simplify:

Dictionary<string, MyClass> d = new Dictionary<string, MyClass>();

into 

var d = new Dictionary<string, MyClass>();

var is a typed variable declarator (unlike javascript)

Upvotes: 0

Joel Coehoorn
Joel Coehoorn

Reputation: 416121

textBox1.Text = d[name].Property;

Upvotes: 1

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