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Aggregate
Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.
Aggregate([seed,] func[, resultSelector])
The initial accumulator value.
An accumulator function to be invoked on each element. TAccumulate func(TAccumulate, TSource)
A function to transform the final accumulator value into the result value. TResult resultSelector(TAccumulate)
The transformed final accumulator value.
The Aggregate method makes it simple to perform a calculation over a sequence of values. This method works by calling func one time for each element in source. Each time func is called, Aggregate passes both the element from the sequence and an aggregated value (as the first argument to func). The value of the seed parameter is used as the initial aggregate value. The result of func replaces the previous aggregated value. The final result of func is passed to resultSelector to obtain the final result of Aggregate.