Even if you know Object Oriented Programming in certain languages like Java, learning C# is totally different. One of the features that varies greatly in C# from Java is passing values by reference as parameters of methods. In Java, data types are automatically passed by value while classes are passed by reference. Good thing I decided to read out a beginner’s book for C#.
In C#, if you want to pass objects by reference, you would have to use the keyword ref. Take for example the sample code below
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string str = "haha"; public void change(string param) { param = "hoho"; } |
If you would call the method change() like this
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change(str); Console.WriteLine(str); |
the output for the object str would be haha instead of hoho. You would have to use the ref keyword for this to work
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public void change(ref string param) { param = "hoho"; } |
Data types are a different story. To do the same way to data types as parameters in methods, you would use the out keyword like this
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int i = 1; public void change(out int param)_ { param = 10; } |
Calling the change method
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change(i); Console.WriteLine(i); |
will output 10 as the value. If you do not use the out keyword, the value of i will still be 1.
I totally forgot about all of these. Are you constantly using this language?
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In this case, actually the string is the mutable class, once it is initialized it cannot be modified. And I found some useful link here: Here.
Class is always send by reference. But the use of ref will be the special case in some coding style.
What’s others say?
I think you should see this
Link
Thanks