复制代码 代码如下:

public static string Replace(string source, string match, string replacement)

{

char[] sArr = source.ToCharArray();

char[] mArr = match.ToCharArray();

char[] rArr = replacement.ToCharArray();

int idx = IndexOf(sArr, mArr);

if (idx == -1)

{

return source;

}

else

{

return new string(sArr.Take(idx).Concat(rArr).Concat(sArr.Skip(idx + mArr.Length)).ToArray());

}

}

/// <summary>

/// 查找字符数组在另一个字符数组中匹配的位置

/// </summary>

/// <param name="source">源字符数组</param>

/// <param name="match">匹配字符数组</param>

/// <returns>匹配的位置，未找到匹配则返回-1</returns>

private static int IndexOf(char[] source, char[] match)

{

int idx = -1;

for (int i = 0; i < source.Length - match.Length; i++)

{

if (source[i] == match[0])

{

bool isMatch = true;

for (int j = 0; j < match.Length; j++)

{

if (source[i + j] != match[j])

{

isMatch = false;

break;

}

}

if (isMatch)

{

idx = i;

break;

}

}

}

return idx;

}