Separator Delimited ToString for Array, List, Dictionary, Generic IEnumerable

Often programmers want to convert an array into one string with for example comma delimited.
Traditionally, in C#, it can be achieved by

int[] array = {1,2,3};
string delimited = string.Join(”,”, array);
Console.WriteLine(delimited ) // output: "1,2,3"
 

However, string.Join does not apply to any generic IEnumerable object. It would so much easier if this method behavior could be applied [...]

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Pointer usage in C#, it must be in unsafe context

static unsafe void Main()
{
    int i;
    int[] array = { 11, 22, 33 };

    // pointer pi has the address of variable i
    int* pi = & i;
    // ppi(addess of pi) < pi(addess of i) < i(0)
    i = [...]

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