[C#] String arrays 三種宣告方式

如題 

	// String arrays 三種宣告方式:
	string[] arr1 = new string[] { "1", "2", "3" };
	string[] arr2 = { "1", "2", "3" }; //匿名
	var arr3 = new string[] { "1", "2", "3" };
	string[] arr4 = new string[3];
	arr4[0] = "1";
	arr4[1] = "2";
	arr4[2] = "3";

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