C# 设置小数两位

C# 设置小数两位

double a=0.98765 ;
double b=System.Convert.ToDouble(string.Format("{0:f2}", a));
或者
double a=0.98765 ;
double b=Math.Round(a,2);

string a = "0.98765 ";
int i= a.IndexOf('.', 0);
string aaa = a.Substring(0, i);
int bbb = Convert.ToInt32(aaa);
string a1 = x.Substring(i + 1, 2);
string b=x.Substring(i + 3, 1);
int b1 = Convert.ToInt32(a1);
int b2 = Convert.ToInt32(b);
if (b2 >= 5)
{
b1 = b1 + 1;
}
if (b1 == 100)
{
b1 = 00;
bbb = bbb + 1;
}
string xx = bbb.ToString() + "." + b1.ToString();

MessageBox.Show(xx);