用C#编写一个控制台应用程序，求1000之内的所有“完数”。所谓“完数”是指一个数恰好等于它的所有因子之和。例如6是完数，因为6=1+2+3。-A console application written in C#, and ask all of 1000, finished the number. The so-called " End"　refers to the number of a number exactly equal to all of its factors. For example, 6 is the complete number, 6 = 1+2+3.