Leave only two decimal places after the dot

问题

public void LoadAveragePingTime()
{
    try
    {
        PingReply pingReply = pingClass.Send(\"logon.chronic-domination.com\");
        double AveragePing = (pingReply.RoundtripTime / 1.75);

        label4.Text = (AveragePing.ToString() + \"ms\");                
    }
    catch (Exception)
    {
        label4.Text = \"Server is currently offline.\";
    }
}

Currently my label4.Text get\'s something like: \"187.371698712637\".

I need it to show something like: \"187.37\"

Only two posts after the DOT. Can someone help me out?

回答1:

string.Format is your friend.

String.Format("{0:0.00}", 123.4567);      // "123.46"

回答2:

If you want to take just two numbers after comma you can use the Math Class that give you the round function for example :

float value = 92.197354542F;
value = (float)System.Math.Round(value,2);         // value = 92.2;

Hope this Help
Cheers

回答3:

// just two decimal places
String.Format("{0:0.00}", 123.4567);      // "123.46"
String.Format("{0:0.00}", 123.4);         // "123.40"
String.Format("{0:0.00}", 123.0);         // "123.00"

http://www.csharp-examples.net/string-format-double/

edit

No idea why they used "String" instead of "string", but the rest is correct.

回答4:

double amount = 31.245678;
amount = Math.Floor(amount * 100) / 100;

回答5:

You can use this

"String.Format("{0:F2}", String Value);"

Gives you only the two digits after Dot, exactly two digits.

回答6:

Using the property of String

double value = 123.456789;
String.Format("{0:0.00}", value);

Note: This can be used to display only.

Using System.Math

double value = 123.456789;
System.Math.Round(value, 2);

回答7:

Try this:

double result = Math.Round(24.576938593,2);
MessageBox.Show(result.ToString());

Output: 24.57

回答8:

yourValue.ToString("0.00") will work.

回答9:

Alternatively, you may also use the composite operator F then indicating how many decimal spots you wish to appear after the decimal.

string.Format("{0:F2}", 123.456789);     //123.46
string.Format("{0:F3}", 123.456789);     //123.457
string.Format("{0:F4}", 123.456789);     //123.4568

It will round up so be aware of that.

I sourced the general documentation. There are a ton of other formatting operators there as well that you may check out.

Source: https://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx

回答10:

Try This

public static string PreciseDecimalValue(double Value, int DigitsAfterDecimal)
        {
            string PreciseDecimalFormat = "{0:0.0}";

            for (int count = 2; count <= DigitsAfterDecimal; count++)
            {
                PreciseDecimalFormat = PreciseDecimalFormat.Insert(PreciseDecimalFormat.LastIndexOf('}'), "0");
            }
            return String.Format(PreciseDecimalFormat, Value);
        }

回答11:

Simple solution:

double totalCost = 123.45678;
totalCost = Convert.ToDouble(String.Format("{0:0.00}", totalCost));

//output: 123.45

回答12:

Use string interpolation decimalVar:0.00

回答13:

double doublVal = 123.45678;

There are two ways.

for display in string:
```
String.Format("{0:0.00}", doublVal );
```

for geting again Double

doublVal = Convert.ToDouble(String.Format("{0:0.00}", doublVal ));

来源：https://stackoverflow.com/questions/1291483/leave-only-two-decimal-places-after-the-dot

标签

ping

decimal-point