In .NET 2.0 it uses the String class internally. String is only immutable outside of the System namespace, so StringBuilder can do that. In .NET 4.0 String was changed to use char[]. In 2.0 StringBuilder looked like this public sealed class StringBuilder : ISerializable { // Fields private const string CapacityField = “Capacity”; internal const … Read more
I warmly suggest you to read The Sad Tragedy of Micro-Optimization Theater, by Jeff Atwood. It treats Simple Concatenation vs. StringBuilder vs. other methods. Now, if you want to see some numbers and graphs, follow the link 😉
A string instance is immutable. You cannot change it after it was created. Any operation that appears to change the string instead returns a new instance: string foo = “Foo”; // returns a new string instance instead of changing the old one string bar = foo.Replace(‘o’, ‘a’); string baz = foo + “bar”; // ditto … Read more
Short answer: it depends. Long answer: if you already have an array of strings to concatenate together (with a delimiter), String.Join is the fastest way of doing it. String.Join can look through all of the strings to work out the exact length it needs, then go again and copy all the data. This means there … Read more
String does not allow appending. Each method you invoke on a String creates a new object and returns it. This is because String is immutable – it cannot change its internal state. On the other hand StringBuilder is mutable. When you call append(..) it alters the internal char array, rather than creating a new string … Read more
Mutability Difference: String is immutable, if you try to alter their values, another object gets created, whereas StringBuffer and StringBuilder are mutable so they can change their values. Thread-Safety Difference: The difference between StringBuffer and StringBuilder is that StringBuffer is thread-safe. So when the application needs to be run only in a single thread then … Read more
Difference between StringBuilder and StringBuffer
Version 1 is preferable because it is shorter and the compiler will in fact turn it into version 2 – no performance difference whatsoever. More importantly given we have only 3 properties it might not make a difference, but at what point do you switch from concat to builder? At the point where you’re concatenating … Read more
How to do it ? If you meet {} in your code , you can use JSONObject to parse it . If you meet [] in your code , you can use JSONArray to parse it . And if you meet [] in your code , you can use for loop to get value in … Read more