///获取相对路径

///例如：System.Windows.Forms.Application.StartupPath = "E:\App\CheckingMachine\QueryMachine\bin\Debug"

/// 经过以下处理将返回"E:\App\CheckingMachine\QueryMachine\images\1.gif"

string path=System.Windows.Forms.Application.StartupPath + @"../../"; 
System.IO.Directory.SetCurrentDirectory(path); 

string strFilePath = System.IO.Directory.GetCurrentDirectory() + @"\images\1.gif";