Add comma to string inside StringFormat in wpf

Question

I have this textblock

   <TextBlock>
      <TextBlock.Text>
        <MultiBinding StringFormat="{}{0}, {1}, {2}, ">
          <Binding Path="object.strProp1" />
          <Binding Path="object.strProp2" />
          <Binding Path="object.strProp3" />
        </MultiBinding>
      </TextBlock.Text>
    </TextBlock>

Let's assume object is not null and *strProp1* = "strProp1", *strProp2* = "strProp2", and *strProp2* = "strProp2".

The output for this would be something like this:

strProp1, strProp2, strProp3,

What I would like to know is how to remove the ',' whenever object is null or one of the properties is empty. That is, if object is null then the Textblock would just be empty. Or if one of the objects is empty then it will just be empty.

Any recommendations on how to this? Thanks! Edit: preferably in xaml only :)

Martin Grundy · Accepted Answer · 2017-05-04 10:59:50Z

5

I know this is an old question but I was doing a similar thing and came up with this solution. You just need to escape the ',' as you would escape special characters in a string with a '\'.

So your binding would be:

<TextBlock>
   <TextBlock.Text>
     <MultiBinding StringFormat="{}{0}\, {1}\, {2}\, ">
       <Binding Path="object.strProp1" />
       <Binding Path="object.strProp2" />
       <Binding Path="object.strProp3" />
     </MultiBinding>
   </TextBlock.Text>
</TextBlock>

answered May 4, 2017 at 10:59

Martin Grundy

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Comments

Anand Murali · Accepted Answer · 2015-05-05 05:32:01Z

2

You have to use a Converter

MultiValueConverter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;

namespace DataBinding
{
    public class MultiStringConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType,
               object parameter, System.Globalization.CultureInfo culture)
        {
            if (values != null)
            {
                StringBuilder formattedString = new StringBuilder();
                int count = 0;
                foreach (var item in values)
                {
                    if (string.IsNullOrEmpty((String)item) == false)
                    {
                        if (count == 0)
                            formattedString.Append(item);
                        else
                            formattedString.Append(", " + item);
                        count++;
                    }

                }
                return formattedString.ToString();
            }
            else
                return null;

        }
        public object[] ConvertBack(object value, Type[] targetTypes,
               object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException("Cannot convert back");
        }
    }
}

XAML

<Window x:Class="DataBinding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:DataBinding"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:MultiStringConverter x:Key="multiStringConverter"/>
    </Window.Resources>

    <TextBlock>
        <TextBlock.Text>
            <MultiBinding Converter="{StaticResource multiStringConverter}">
                <Binding Path="object.strProp1" />
                <Binding Path="object.strProp2" />
                <Binding Path="object.strProp3" />
            </MultiBinding>
        </TextBlock.Text>
    </TextBlock>

</Window>

answered May 5, 2015 at 5:32

Anand Murali

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3 Comments

Macho Gwapito Over a year ago

Thanks for the answer! I'll think about this... I just have another question, is there no other way to do this with just xaml?

Anand Murali Over a year ago

I did a quick search msdn.microsoft.com/en-us/library/txafckwd(v=vs.110).aspx and a pure XAML solution isn't possible.

Abdullah Tahan Over a year ago

you can short this converter to be return string.Join(", ", values.Where(o => !string.IsNullOrEmpty(o as string)));

Abdullah Tahan · Accepted Answer · 2023-02-16 16:15:26Z

<TextBlock TextWrapping="Wrap">
    <TextBlock.Style>
        <Style TargetType="{x:Type TextBlock}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Address.FullAddress}" Value="">
                    <Setter Property="Visibility" Value="Hidden"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
    <Run Text="{Binding Address.LineOne}"/>
    <Run Text="{Binding 
        Address.LineTwo, 
        StringFormat='{}{0}, ',
        TargetNullValue=''}"/>
    <Run Text="{Binding 
        Address.City, 
        StringFormat='{}{0}, ',
        TargetNullValue=''}"/>
    <Run Text="{Binding Address.StateProvince}"/>
    <Run Text="{Binding 
        Address.Zip, 
        StringFormat='{}{0}, ',
        TargetNullValue=''}"/>
    <Run Text="{Binding Address.Country}"/>
</TextBlock>

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