How is a String object instantiated?

I need some clarification over the below code. I know that str.Length will return the number of characters in the string.

string str = "Sample string";
int length = str.Length;

My clarification is: Since we are not creating the s开发者_StackOverflowtring object, how the "Sample string" string is assigned to str variable?

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The string literal "Sample string" is created by the compiler, and will be stored in the assembly for you. When you assign it to your reference, you get a reference to that literal string.

There is a ldstr instruction that specifically loads literal strings from assembly metadata into a string object reference. It is that reference that has it's Length property checked.

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The compiler is creating the string object for you.

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When you say "Sample String" in memory a new string object is created the same as if you called new String("Sample String");. This is just a macro to improve readability.