文本框不允许我输入小数 [英] TextBox Won't Allow me to enter in a decimal

问题描述

我可以在文本框中输入数字，但它不允许我输入十进制值.请问这是为什么?

I can Enter Numbers into the text box but it won't allow me to enter decimal values. May I ask why is this?

<TextBox Text="{Binding SebAmountPer, Mode=Twoway, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="2" TextWrapping="Wrap"/>

public decimal? SebAmountPer
{
    get
    {
        return _seb.SEBAmountPer;
    }
    set
    {
        _seb.SEBAmountPer = value; 
        OnPropertyChanged("SebAmountPer");
        OnPropertyChanged("SebTotal");
    }
}

推荐答案

一种廉价的解决方法(如果您仍想保留内置验证并绑定到可空属性)，是添加一个小的 绑定内的延迟.这允许您实际输入一个小数"点，并在延迟"之后绑定，然后评估该值是否正确.

A cheap work-around (if you still want to keep the built-in validation and binding to a nullable property), is to add a small Delay within the binding. This allows you to actually enter in a 'decimal' point, and after the 'delay' it binds, then evaluates the value as correct.

示例:

  <TextBox Text="{Binding SebAmountPer, UpdateSourceTrigger=PropertyChanged, TargetNullValue='', Delay=350}" Height="75" Width="300" TextWrapping="Wrap"/>

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