How to use NumberFormatInfo to remove parenthesis for negative values

问题

We're currently using the following for creating US dollar values in our web application:

string.Format("{0:C0}", dollarValue );

In this example, if dollarValue is 145, then we'll see: $145. If it is -145, then we'll see ($145) rather than -$145. Note that for us, dollarValue is a double, but it could be any number-type. I think.

Anyway, what I want is for it to be either $145 or -$145.

Now, according to my research, it might be possible to do this using the NumberFormatInfo class. I can't figure out how to use it, and I can't find any valid example. I did see this question here: C# creating a custom NumberFormatInfo to display "Free" when a currency value is $0.00 but the example from MSDN linked to from this question seems a bit different from what I really want to do.

I realize, I will need to do something of the following:

double dollarValue = -145d;
string myMoney = dollarValue.ToString( "C0", someIFormatProvider );

where someIFormatProvider is likely of type NumberFormatInfo. Now, what I've done is this:

NumberFormatInfo ni = new NumberformatInfo();
ni.CurrencyNegativePattern = 1; // The value 1 should mean not to use parenthesis
string myMoney = dollarValue.ToString( "C0", ni );

...and I get an "Instance is Read-Only" exception. While the "documentation" for the CurrencyNegativePattern property says you can SET and GET the value, apparently, you can't. Also, NumberFormatInfo is a sealed class. I can't easily create a new class based off it and override the value.

I'm at a loss as to how to deal with this. Right now, my workaround is to just negate my negative value and have a positive result that I do the string.Format(...) again. Yes, I realize there is no negative sign in front of this, but, of course, that's easily resolved by adding a "-" in front of the result as needed.

Would someone be able to provide me with a working example of how to effectively use the NumbefFormatInfo class correctly in this situation? Thanks.

回答1:

double dollarValue = -145d;
 System.Globalization.CultureInfo modCulture = new System.Globalization.CultureInfo("en-US");
 string mymoney = dollarValue.ToString("C", modCulture);
          MessageBox.Show(mymoney);

If your Operating System current culture is en-US then you dont need the following line

System.Globalization.CultureInfo modCulture = new System.Globalization.CultureInfo("en-US");

The code will be

double dollarValue = -145d;
string mymoney = dollarValue.ToString("C");

and If you want to do with NumberFormatInfo

double dollarValue = -145d; 
System.Globalization.CultureInfo modCulture = new System.Globalization.CultureInfo("en-US");
     NumberFormatInfo number = modCulture.NumberFormat;
     string mymoney = dollarValue.ToString("C", number);

another way

double dollarValue = -145d;
System.Globalization.CultureInfo modCulture = new System.Globalization.CultureInfo("en-US");
NumberFormatInfo number = modCulture.NumberFormat;
string mymoney = dollarValue.ToString(String.Format("C",number));
Console.WriteLine(mymoney);

回答2:

You can make a clone of the NumberFormat property in the CurrentCulture (this will ensure that you keep the correct currency symbol if you globalize your application). After that, just set the CurrencyNegativePattern property to the desired value and pass in your NumberFormatInfo in the double.ToString() function, like so:

NumberFormatInfo noParens = (NumberFormatInfo)CultureInfo.CurrentCulture.NumberFormat.Clone();
noParens.CurrencyNegativePattern = 1;
double dollarValue = -145d;
string output = dollarValue.ToString("C0", noParens); // outputs -$145

回答3:

Try this...

string.Format( "{0:$#.;-$#.}", -145 )

dollarValue.ToString("$#.;-$#.")

回答4:

'instance is ReadOnly' means you have a read-only instance of NumberFormatInfo. You can get a writable instance by cloning a read-only instance:

NumberFormatInfo writeable = (NumberFormatInfo) ni.Clone();

回答5:

Are you sure the CurrencyNegativePattern can't be assign? I've tried with this code:

double dollarValue = -145d;
System.Globalization.NumberFormatInfo ni = new System.Globalization.NumberFormatInfo();
ni.CurrencyNegativePattern = 1;
dropDownList.Items.Add(new ListItem(dollarValue.ToString("C0", ni)));

and it's success.

回答6:

To make sure you remain in a "US-context" I'd do something like this:

double val = -145d;
NumberFormatInfo nfi = new CultureInfo("en-US").NumberFormat;
nfi.CurrencyNegativePattern = 1;
val.ToString("C0", nfi).Dump();

The Dump comes from LinqPad, which displays -$145 as a result.

The error you are getting feels like it comes from you getting your NumberFormatInfo something like this:

NumberFormatInfo nfi = Thread.CurrentThread.CurrentCulture.NumberFormat;

In which case I'd replace by something like this:

NumberFormatInfo nfi = (NumberFormatInfo)Thread.CurrentThread.CurrentCulture.NumberFormat.Clone();

来源：https://stackoverflow.com/questions/11014878/how-to-use-numberformatinfo-to-remove-parenthesis-for-negative-values

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globalization

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