[C#]几种字符串反转方法效率比较

下面是实现字符串反转的四种方法：

static string Reverse1(string original)

static string Revease21(string original)

static string Revease22(string original)

static string Revease3(string original)
　　　static void Main(string[] args)
[ReliabilityContract(Consistency.MayCorruptInstance, Cer.MayFail)]
public static void Reverse(Array array)

[ReliabilityContract(Consistency.MayCorruptInstance, Cer.MayFail)]
public static void Reverse(Array array, int index, int length)
public StringBuilder Append(string value)

private bool NeedsAllocation(string currentString, int requiredLength)

internal unsafe void AppendInPlace(string value, int currentLength)
...{


int num1 = value.Length;


int num2 = currentLength + num1;


fixed (char* chRef1 = &this.m_firstChar)




...{


fixed (char* chRef2 = &value.m_firstChar)




...{


string.wstrcpy(chRef1 + currentLength, chRef2, num1);


}


chRef1[num2] = '

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