Avoid packing the string. Format method.

Avoid packing the string. Format method.

 

We know that the string. Format method may be boxed. For example:

 

        static void Main(string[] args)
        {
String s = string. Format ("splicing {0} and {1}", 1, 2 );
            Console.WriteLine(s);
            Console.ReadKey();
        }

 

The last two parameters received by the string. Format () method are of the object type. Therefore, packing exists here.

 

Check the IL code:

 

→ Open "Developer command prompt"

→ Navigate to the application folder

→ Use ildasm to view the application's il code and output it to the txt file

Open 1.txt text file in Notepad

→ I saw two times of packing in the IL code.

 

If string is frequently called multiple times in our application. the Format method, such as logging, causes many times of binning of the value type, which also results in many memory allocations and many times of garbage collection.

 

How can this problem be solved?
-- Concatenate strings

 

The modification code is as follows:

 

        static void Main(string[] args)
        {
String s = "splicing" + 1. ToString () + "and" + 2. ToString ();
            Console.WriteLine(s);
            Console.ReadKey();
        }

 

We can see that String concatenation prevents the occurrence of packing.