与Wpf绑定时有没有办法使用System.String函数而不使用转换器？

Question

与Wpf绑定时有没有办法使用System.String函数而不使用转换器？

<TextBlock Text="({Binding Path=Text}).Trim()"/>

这基本上是我的愿望.

Answer 1

我会用转换器.

绑定Xaml

<StackPanel>
  <StackPanel.Resources>
    <local:StringTrimmingConverter x:Key="trimmingConverter" />
  <StackPanel.Resources>
  <TextBlock Text="{Binding Path=Text, Converter={StaticResource trimmingConverter}}" />
</StackPanel>

StringTrimmingConverter.cs

using System;
using System.Windows.Data;

namespace WpfApplication1
{
    [ValueConversion(typeof(string), typeof(string))]
    public class StringTrimmingConverter : IValueConverter
    {
        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return value.ToString().Trim();
        }
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return value;
        }
        #endregion
    }
}

如果是VB StringTrimmingConverter.vb

Imports System.Globalization

Public Class StringTrimmingConverter
    Implements IValueConverter

    Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
        Return value.ToString().Trim
    End Function

    Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.Convert
        Return value
    End Function

End Class