源字符串:adddd dd ggg df d
处理后:adddd dd ggg df d
textBox1.Text = "adddd dd ggg df d ";
string strOld=textBox1.Text;
string strNew="";
strNew=Regex.Replace(strOld.Trim()," +"," ");
//结果为adddd dd ggg df d
textBox2.Text=strNew;
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