/// <summary>
/// 替换第一个匹配的字符
/// </summary>
/// <param name="text"></param>
/// <param name="search"></param>
/// <param name="replace"></param>
/// <returns></returns>
public static string ReplaceFirst(string text, string search, string replace)
{
int pos = text.IndexOf(search);
if (pos < 0)
{
return text;
}
return text.Substring(0, pos) + replace + text.Substring(pos + search.Length);
}