常用数字处理函数
1.对计算结果四舍五入(d:数,i小数位数)
效果: 233.8763
--> 233.88
1 //d: 表示四舍五入的数字; i: 保留的小数位数
2
3 public static double Round(double d, int i)
4
5 {
6
7 if (d >= 0)
8
9 {
10
11 d += 5 * Math.Pow(10, -(i + 1));
12
13 }
14
15 else
16
17 {
18
19 d += -5 * Math.Pow(10, -(i + 1));
20
21 }
22
23 string str = d.ToString();
24
25 string[] strs = str.Split('.');
26
27 int idot = str.IndexOf('.');
28
29 string prestr = strs[0];
30
31 string poststr = strs[1];
32
33 if (poststr.Length > i)
34
35 {
36
37 poststr = str.Substring(idot + 1, i);//截取需要位数
38
39 }
40
41 if (poststr.Length <= 2)
42
43 {
44
45 poststr = poststr + "0";
46
47 }
48
49 string strd = prestr + "." + poststr;
50
51 d = Double.Parse(strd);//将字符串转换为双精度实数
52
53 return d;
54
55
2.将商品金额小写转换成大写
效果: 1234566789
-->壹拾贰亿叁仟肆佰伍拾陆万陆仟柒佰捌拾玖元
1 private void Convert_Click(object sender, EventArgs e)
2
3 {
4
5 String[] Scale = { "分", "角", "元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "兆", "拾", "佰", "仟" };
6
7 String[] Base = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
8
9 String Temp = textBox1.Text.ToString();
10
11 String Info = null;
12
13 int index = Temp.IndexOf(".", 0, Temp.Length);//判断是否有小数点
14
15 if (index != -1)
16
17 {
18
19 Temp = Temp.Remove(Temp.IndexOf("."), 1);
20
21 for (int i = Temp.Length; i > 0; i--)
22
23 {
24
25 int Data = Convert.ToInt16(Temp[Temp.Length - i]);
26
27 Info += Base[Data - 48];
28
29 Info += Scale[i - 1];
30
31 }
32
33 }
34
35 else
36
37 {
38
39 for (int i = Temp.Length; i > 0; i--)
40
41 {
42
43
44
45 int Data = Convert.ToInt16(Temp[Temp.Length - i]);
46
47 Info += Base[Data - 48];
48
49 Info += Scale[i + 1];
50
51 }
52
53
54
55 }
56
57
58
59 textBox2.Text = Info;
60
61
3.设置货币值中使用的小数位数
1 System.Globalization.NumberFormatInfo GN = new System.Globalization.CultureInfo("zh-CN", false).NumberFormat;
2
3 Int64 myInt = 12345;
4
5 private void SetLL_Click(object sender, EventArgs e)
6
7 {
8
9 GN.CurrencyDecimalDigits = 4;
10
11 MessageBox.Show(myInt.ToString("C", GN), "保留四位小数");
12
13
4.自定义货币值中的小数点
1 System.Globalization.NumberFormatInfo GN = new System.Globalization.CultureInfo("zh-CN", false).NumberFormat;
2
3 Int64 myInt = 123456789;
4
5 private void button1_Click(object sender, EventArgs e)
6
7 {
8
9 GN.CurrencyDecimalSeparator = "$";
10
11 MessageBox.Show("定义前:" + myInt.ToString("C") + "\n" + "定义后:" + myInt.ToString("C", GN), "自定义小数点为$符");
12
13
5.自定义货币值中小数点左边每一组的位数
1 System.Globalization.NumberFormatInfo CN = new System.Globalization.CultureInfo("en-US", false).NumberFormat;
2
3 Int64 myInt = 123456789012345;
4
5 int[] mySizes1 = { 2, 3, 1 };
6
7 int[] mySizes2 = { 2, 3, 2 };
8
9 CN.CurrencyGroupSizes = mySizes1;
10
11 MessageBox.Show("定义前：" + myInt.ToString("C") + "\n" + "定义后：" + myInt.ToString("C", CN), "{ 2, 3, 1 }格式");
12
13 CN.CurrencyGroupSizes = mySizes2;
14
15 MessageBox.Show("定义前：" + myInt.ToString("C") + "\n" + "定义后：" + myInt.ToString("C", CN), "{ 2, 3, 2 }格式"
6.自定义货币值中小数点左边数字分组字符
1 System.Globalization.NumberFormatInfo GN = new System.Globalization.CultureInfo("en-US", false).NumberFormat;
2
3 Int64 myInt = 123456789;
4
5 GN.CurrencyGroupSeparator = "、";
6
7 MessageBox.Show("定义前： " + myInt.ToString("C") + "\n" + "定义后： " + myInt.ToString("C", GN), "分组字符用、号"
7.自定义百分比符号
效果: 默认符号： 10,257,865.84%
自定义符号&： 10,257,865.84&
自定义符号*： 10,257,865.84*
自定义符号#： 10,257,865.84#
1 System.Globalization.NumberFormatInfo GN = new System.Globalization.CultureInfo("zh-CN", false).NumberFormat;
2
3 double intPrecnt = 102578.6584;
4
5 string strPrecnt = null;
6
7 GN.PercentSymbol = "%";
8
9 strPrecnt += "默认符号： " + intPrecnt.ToString("p", GN);
10
11 GN.PercentSymbol = "&";
12
13 strPrecnt += "\n自定义符号&： " + intPrecnt.ToString("p", GN);
14
15 GN.PercentSymbol = "*";
16
17 strPrecnt += "\n自定义符号*： " + intPrecnt.ToString("p", GN);
18
19 GN.PercentSymbol = "#";
20
21 strPrecnt += "\n自定义符号#： " + intPrecnt.ToString("p", GN);
22
23 MessageBox.Show(strPrecnt, "设置效果"
8.自定义数字小数点右边的保留位数
效果: 原始数字: 4458524.2568412547
默认小数位数：4,458,524.26
保留三位小数：4,458,524.257
保留五位小数：4,458,524.25684
保留五位小数：4,458,524.2568413
1 System.Globalization.NumberFormatInfo GN = new System.Globalization.CultureInfo("zh-CN", false).NumberFormat;
2
3 double intNumber = 4458524.2568412547;
4
5 string strNumber = "";
6
7 strNumber += "默认小数位数：" + intNumber.ToString("N");
8
9 GN.NumberDecimalDigits = 3;
10
11 strNumber += "\n保留三位小数：" + intNumber.ToString("N", GN);
12
13 GN.NumberDecimalDigits = 5;
14
15 strNumber += "\n保留五位小数：" + intNumber.ToString("N", GN);
16
17 GN.NumberDecimalDigits = 7;
18
19 strNumber += "\n保留五位小数：" + intNumber.ToString("N", GN);
20
21 MessageBox.Show(strNumber, "设置效果"
9.自定义数字小数点左边分组位数(从小数点开始向左)
效果: 默认格式：711,413,414,517.12
{ 1, 3, 4 }格式：7114,1341,451,7.12
{ 2, 3, 0 }格式：7114134,145,17.12
{ 2, 6, 2 }格式：71,14,134145,17.12
1 System.Globalization.NumberFormatInfo GN = new System.Globalization.CultureInfo("zh-CN", false).NumberFormat;
2
3 double intNumber = 711413414517.12;
4
5 string strNumber = null;
6
7 strNumber += "默认格式：" + intNumber.ToString("N", GN);
8
9 int[] MySizes1 = { 1, 3, 4 };
10
11 GN.NumberGroupSizes = MySizes1;
12
13 strNumber += "\n{ 1, 3, 4 }格式：" + intNumber.ToString("N", GN);
14
15 int[] MySizes2 = { 2, 3, 0 };
16
17 GN.NumberGroupSizes = MySizes2;
18
19 strNumber += "\n{ 2, 3, 0 }格式：" + intNumber.ToString("N", GN);
20
21 int[] MySizes3 = { 2, 6, 2 };
22
23 GN.NumberGroupSizes = MySizes3;
24
25 strNumber += "\n{ 2, 6, 2 }格式：" + intNumber.ToString("N", GN);
26
27 MessageBox.Show(strNumber, "设置效果"
10.格式化输入数据为货币格式
效果: 输入: 12345
输出: ￥12 345.00
1 try
2
3 {
4
5 System.Globalization.NumberFormatInfo nfi = new System.Globalization.CultureInfo("zh-CN", false).NumberFormat;
6
7 nfi.CurrencyGroupSeparator = " ";
8
9 textBox2.Text = Convert.ToDouble(textBox1.Text).ToString("c", nfi);
10
11 }
12
13 catch (Exception ee)
14
15 {
16
17 MessageBox.Show(ee.Message);
18
19
