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string input = "ds fds fdsf dsfdsf dsfd";
Regex regex = new Regex(@"(?is)(\s+)");
string result = regex.Replace(input, " ");
tempStr = Regex.Replace(tempStr,@"\s+"," ");
string strline = 一行字符串;
while (strline.IndexOf(" ") > -1)
{
strline.Replace(" ", " ");
}