WPF DataGridTextColumn Can't type point for float data

问题

I had a WPF DataGrid and use DataGridTextColumn Binding to a Collection. The items in Collection had some float property.

When my program launched, I modify the value of float property in DataGrid, if I type a integer value, it works well. But if I type char . for a float value, char . can't be typed. I had to type all the numbers first, and then jump to the . position to type char . to finish my input.

So how can I type . in my situation?

Thanks.

回答1:

Also met the same problem.

For my case, it is due to the data binding options.

I changed from *.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; to *.UpdateSourceTrigger = UpdateSourceTrigger.LostFocus;.

Then it can type float number directly.

回答2:

It could be an issue with Localization. Try changing the Culture settings of your thread to check out if this could be the problem:

using System.Globalization;
using System.Threading;

Thread.CurrentThread.CurrentUICulture = new CultureInfo("en");

you can double-check the settings if you are unsure in which Culture you are running by going to Control Panel > Clock, Language and Region or running the following code:

using System.Diagnostics;

Debug.WriteLine("decimal: " + Thread.CurrentThread.CurrentUICulture.NumberFormat.NumberDecimalSeparator);
Debug.WriteLine("thousand: " + Thread.CurrentThread.CurrentUICulture.NumberFormat.NumberGroupSeparator);

回答3:

Try this Regular Expression Validation in Binding.

<Validator:RegexValidationRule x:Key="DecimalValidatorFor3Digits"
    RegularExpression="^\d{0,3}(\.\d{0,2})?$"
    ErrorMessage="The field must contain only numbers with max 3 integers and 2 decimals" />

Thanks

Ck Nitin (TinTin)

回答4:

I suppose it's because your datagridcolumn is bound to your class member with decimal datatype, e.g.

public class Product : ModelBase
{
    decimal _price = 0;
    public decimal Price
    {
        get { return _price; }
        set { _price = value; OnPropertyChanged("Price"); }
    }
}

and the UpdateSourceTrigger=PropertyChanged. One way to do get rid of it is to change the property to string type, and manipulate the string like below:

string _price = "0.00";
    public string Price
    {
        get { return _price; }
        set 
        {
            string s = value;
            decimal d = 0;
            if (decimal.TryParse(value, out d))
                _price = s;
            else
                _price = s.Substring(0, s.Length == 0 ? 0 : s.Length - 1);
            OnPropertyChanged("Price"); 
        }
    }

Hope it helps

来源：https://stackoverflow.com/questions/13949778/wpf-datagridtextcolumn-cant-type-point-for-float-data

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wpf

datagrid

datagridtextcolumn