string的find("")

        string TempRangeData1 = Excel_set->GetRangeData(count1+i, 3);

        string strleft;
        int FindMin = TempRangeData1.find(("_"));
        if (FindMin != -1)
        {
            strleft = (TempRangeData1.substr(0, TempRangeData1.find("_")));//提取左值
        }