逆置数组

1 快速逆置数组

 可以使用Array中的Reverse方法。如：

int[] array = new int[] {1,3,5,4,2 }; Array.Reverse(array); foreach (int n in array) Console.WriteLine(n);

2 自己编写一个方法：DoReversal.优点：速度快,支持任何类型，不必装箱和拆箱。

public static void DoReversal<T>(T[] theArray) { T tempHolder = default(T); if (theArray.Length > 0) { for (int count = 0; count < (theArray.Length) / 2; count++) { tempHolder = theArray[count]; theArray[count] = theArray[theArray.Length - count - 1]; theArray[theArray.Length - count - 1] = tempHolder; } } else { Console.WriteLine("Nothing to reverse"); } }

3 逆置二维数组

 逆置二维数组不能用Array中的Reverse方法，必须自己编写一个方法，如：

public static void Reverse2DimArray<T>(T[,] theArray) { for (int rowIndex = 0; rowIndex <= (theArray.GetUpperBound(0)); rowIndex++) { for (int colIndex = 0; colIndex <= (theArray.GetUpperBound(1) / 2); colIndex++) { T tempHolder = theArray[rowIndex, colIndex]; theArray[rowIndex, colIndex] = theArray[rowIndex, theArray.GetUpperBound(1) - colIndex]; theArray[rowIndex, theArray.GetUpperBound(1) - colIndex] = tempHolder; } } }

GetUpperBound可以获取数组的最高下标，即该维数组下标的最大数。