Hi all,
Here is what I can answer about the above question:
What is difference between Static, read only and Static read only variable in C#.
Static:
Static Variables, Methods or Classes are directly accessible without creating instance of a class as:
public class NonStaticClass
{
//Static method
public static string HelloWorld(string Name)
{
return "Hello" + Name;
}
//Static variable
public static string staticname
{
get;
set;
}
}
Accessing above method and variable
protected void Page_Load(object sender, EventArgs e)
{
//Calling static method
lblNonStatic.Text = NonStaticClass.HelloWorld("sunder");
//Calling static variable
string name = NonStaticClass.StaticVariable;
}
ReadOnly:
In such cases where we want to pre-set the value of the variable which should not be changed by any method further we user ReadOnly for instance:
public class ManageTime
{
//ReadOnly variable
readonly DateTime StartTime;
public ManageTime()
{
this.StartTime = DateTime.Now;
}
//Method Accessing StartTime
public DateTime GetStartTime()
{
//You may want to change the time here. But, it is not allowed due to "ReadOnly" nature of property
return this.StartTime;
}
}
Static ReadOnly:
As we seen above static class does not need instantiation so in the same way static readonly variables are pre-populated and stored in the memory.
Static ReadOnly variable can not be assigned on Initialization because of its static nature.
public class StaticManageTime
{
//ReadOnly variable
static readonly DateTime StartTime=DateTime.Now;
public StaticManageTime()
{
If you will try to assign the value of StartTime in constructor. It will throw an error.
this.StartTime = DateTime.Now;
//<- error "A static readonly field cannot be assigned to (except in a static constructor or a variable initializer)
}
//Method Accessing StartTime
public DateTime GetStartTime()
{
//You may want to change the time here. But, it is not allowed due to "ReadOnly" nature of property
return StartTime;
}
}
Sunder Magar
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