c# - How to use the symbols +=, *=,-= -

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These interfaces can be simple but the difficulty of finding explanations that is fixed and complete, prompted me to ask a similar mark ( Such as * =, - =, + =, etc.), what are the character combinations of an operand, what do they do and how are they useful (especially related to non-numeric fields)?

Examples and definitions will be highly appreciated.

Thanks

They usually widely Explain: 

  x + = y === x = x + y

(for operator's own choice etc.)

However ; In some languages ​​you can bespoke + = operator *, or in some situations it can be interpreted differently; For example, in C # events, + = and - = mean "subscribe through ad accessor" and "Cancel membership via exit access" respectively.

Usually They are just space saver, but in some cases, may be meaningful difference.

* = Where I mean: Only + operator and assignment


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