How to use the type 'Type'

I know that I can use the type string as:

string someString = "This is my string";

I am not sure how to use the type Type

Type someType = someString开发者_运维知识库.GetType();

How could I create a variable based on that type. I want to do something like

someType someOtherString = "here is another string";
//string 

In other words, how could I create a variable based on some type?

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There are a few ways to go about this, but the simplest would be to use the Activator class.

http://msdn.microsoft.com/en-us/library/system.activator.createinstance.aspx

Example:

Type t = someClassInstance.GetType();
object o = Activator.CreateInstance(t);

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Variable types have to be known at declaration time. You can declare a variable of type object and then dynamically create an instance of a type which you only know about at execution time, but you can't dynamically declare a variable like that.

The closest you could get would be to create a generic type and instantiate that using a type argument specified with reflection. Then you really would have a variable of the right type - but you wouldn't be able to do anything particularly useful with it.

It's important to distinguish between the type of a variable and the type of the object a variable's value may refer to. For example:

object foo = Activator.CreateInstance(someType);

will end up with a variable of type object, but the value of foo will be a reference to an instance of whatever type someType refers to.

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Try

 var object = Activator.CreateInstance(myType);

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Starting from C# 3 you can do:

var someOtherString = "here is another string";

This way you don't care what's the type, var is type "joker" and save you the need to know the type at declaration time.

Hope that's what you mean?

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use Assembly.CreateInstance()

Type type = typeof(String);
Assembly asm = Assembly.GetExecutingAssembly();
object blah = asm.CreateInstance(type.FullName);