C # highlights of methods for retaining decimal places

1. system. Globalization. numberformatinfo provider = new system. Globalization. numberformatinfo ();
Provider. numberdecimaldigits = intdeclength; // number of decimal places to be set
Double strcashamt=convert.todouble(this.txt cashamt. Text); // convert the value in the control to double

This.txt cashamt. Text = strcashamt. tostring ("N", provider); // use the tostring function to format decimal places.

2. Keep N bits, rounded down.

Decimal d = decimal. Round (decimal. parse ("0.55555"), 2 );

3. Keep n digits rounded

Math. Round (0.55555, 2)

4. Keep n digits rounded
Double dbdata = 0.55555;
String str1 = dbdata. tostring ("F2"); // FN retains N bits, rounded

5. Keep n digits rounded

String result = string. Format ("{0: N2}", 0.55555); // two digits

String result = string. Format ("{0: N3}", 0.55555); // three digits

6. Keep n digits rounded (good)

Double S = 0.55555;
Result = S. tostring ("#0.00"); // a few digits are retained after a few zeros.

C # solution for displaying the number of decimals retained and percentage signs:

1. Use the numberformatinfo class to solve the problem:
System. Globalization. numberformatinfo provider = new system. Globalization. numberformatinfo ();

Provider. percentdecimaldigits = 2; // number of decimal places reserved.
Provider. percentpositivepattern = 2; // Where is the percent sign.
Double result = (double) 1/3; // be sure to use the double type.
Response. Write (result. tostring ("P", provider ));

2. Use the tostring method .:
Public String getrate (double hcount, double task)
{
String rvalue;
String temp = "";

If (task = 0)
{
Task = 1;
}

Double DB = (hcount/task) * 100;

If (hcount> = task)
{
Rvalue = "100% ";
}
Else
{
Rvalue = dB. tostring ("#0. #0") + "% ";
}
Return rvalue;
}

string str1 = string. format ("{0: N1}", 56789); // result: 56,789.0
string str2 = string. format ("{0: N2}", 56789); // result: 56,789.00
string str3 = string. format ("{0: N3}", 56789); // result: 56,789.000
string str8 = string. format ("{0: F1}", 56789); // result: 56789.0
string str9 = string. format ("{0: F2}", 56789); // result: 56789.00
string str11 = (56789/100 .0 ). tostring ("#. # "); // result: 567.89
string str12 = (56789/100 ). tostring ("#. # "); // result: 567