Convert.ToString(Convert.ToDouble(widthList[selectIndex].Replace("%", "")) - 0.4) + "%"
我说下意思哈:
string ss = widthList[i].Replace("%", "");先替换%
double s1 = Convert.ToDouble(ss);转化为double类型
double s2 = s1 - 0.4;double类型然后减0.4
string s3 = s2 + "%";然后加上%











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