如何在 UWP 中为 NumberBox 应用 PercentFormatter? [英] How to Apply PercentFormatter for a NumberBox in UWP?

问题描述

我想在最后添加百分比(0%-100%).它正确地显示了 %，但它像这样在末尾添加了更多的零，

I want to add Percentage at the end(0%-100%). It shows % correctly, but it add more zeros at the end like this,

        double number = 75;
        NumberBoxnumberBox = new NumberBox {  };
        PercentFormatter percentFormatter = new PercentFormatter();
        percentFormatter.FractionDigits = 0;
        percentFormatter.IntegerDigits = 1;
        numberBox.NumberFormatter = percentFormatter;
        numberBox.Value=number;

推荐答案

这实际上是意料之中的.PercentFormatter 接受任意数字并使用1=100% 的(数学)规则对其进行格式化.所以在你的情况下，75 是 7500%.为了达到附加%"的效果，对于数字，您可以编写自己的格式化程序并使用它:

This is actually expected. The PercentFormatter takes an arbitrary number and formats it as using the (mathematical) rule that 1=100%. So in your case, 75 is 7500%. To achieve the affect of appending a "%" to numbers, you can write your own formatter and use that:

public class AppendPercentageSignFormatter : INumberFormatter2, INumberParser
{
    public string FormatInt(long value)
    {
        return value.ToString() + "%";
    }

    public string FormatUInt(ulong value)
    {
        return value.ToString() + "%";
    }

    public string FormatDouble(double value)
    {
        return value.ToString() + "%";
    }

    public long? ParseInt(string text)
    {
        // Cut off the percentage sign at the end of the string and parse that.
        return long.Parse(text.Substring(0, text.Length - 1));
    }

    public ulong? ParseUInt(string text)
    {
        // Cut off the percentage sign at the end of the string and parse that.
        return ulong.Parse(text.Substring(0, text.Length - 1));
    }

    public double? ParseDouble(string text)
    {
        // Cut off the percentage sign at the end of the string and parse that.
        return double.Parse(text.Substring(0, text.Length - 1));
    }
}

// And later in your UI:
double number = 75;
numberBox.NumberFormatter = new AppendPercentageSignFormatter();
numberBox.Value = number;

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