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string tmp="c:\\wwww\\ddd\\ass";
System.Collections.IDictionary dict = Environment.GetEnvironmentVariables();
string str = dict["Path"].ToString();
MessageBox.Show(str,"原始值");
str = str + ";"+tmp ;
MessageBox.Show(str,"期望值");
System.Environment.SetEnvironmentVariable("Path", str);
str = dict["Path"].ToString();
MessageBox.Show(str,"实际值");