syntax - Single line increment and return statement in C# -

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having been playing around c# last few days , trying take advantage of "succinct" syntax have tried use following trick.

int32 _lastindex = -1;  t[] _array; _array[_lastindex++] = obj;

now problem returns value prior incrementing number, tried...

_array[(_lastindex++)] = obj;

and yet same behavior occurring (which has got me bit confused).

could firstly explain why second example (i understand why first) doesn't work? , there way of accomplishing trying do?

surrounding post-increment _lastindex++ parentheses doesn't separate distinct operation, changes:

_array[_lastindex++] = obj;    // _array[_lastindex] = obj; _lastindex++;

into:

_array[(_lastindex++)] = obj;  // _array[(_lastindex)] = obj; _lastindex++;

if want increment before use, need pre-increment variant, follows:

_array[++_lastindex] = obj;    // ++_lastindex; _array[_lastindex] = obj;

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