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POHow call a general method with data binding?
 

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    <p>I would like to understand how to correctly use MVVM and data binding when we are working with many properties.</p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;TextBox Height="23" HorizontalAlignment="Left" Margin="12,12,0,0" Name="textBox1" VerticalAlignment="Top" Width="463" Text="{Binding OriginalText, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;Label Height="28" HorizontalAlignment="Left" Margin="12,242,0,0" Name="label1" VerticalAlignment="Top" Width="463" Content="{Binding ModifiedText}"/&gt; &lt;CheckBox Content="Upper" Height="16" HorizontalAlignment="Left" Margin="12,41,0,0" Name="checkBox1" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Underline" Height="16" HorizontalAlignment="Left" Margin="12,63,0,0" Name="checkBox2" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Bold" Height="16" HorizontalAlignment="Left" Margin="12,85,0,0" Name="checkBox3" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Shadow" Height="16" HorizontalAlignment="Left" Margin="12,107,0,0" Name="checkBox4" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Red" Height="16" HorizontalAlignment="Left" Margin="12,129,0,0" Name="checkBox5" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Scary" Height="16" HorizontalAlignment="Left" Margin="12,151,0,0" Name="checkBox6" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Remove first letter" Height="16" HorizontalAlignment="Left" Margin="12,173,0,0" Name="checkBox7" VerticalAlignment="Top" /&gt; &lt;CheckBox Content="Remove last letter" Height="16" HorizontalAlignment="Left" Margin="12,195,0,0" Name="checkBox8" VerticalAlignment="Top" /&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>I have a OriginalText TextBox and a ModifiedText Label. When I check a box I would like to directly apply the modification without having to click a button. How should I do that?</p> <p>In my ViewModel I created all the properties that are binded to the XAML CheckBox.</p> <pre><code> private string _originalText = string.Empty; public string OriginalText { get { return _originalText; } set { _originalText = value; NotifyPropertyChanged("OriginalText"); } } private string _modifiedText; public string ModifiedText { get { return _originalText; } set { _originalText = value; NotifyPropertyChanged("ModifiedText"); } } private bool upper; public bool Upper { get { return upper; } set { upper = value; NotifyPropertyChanged("Upper"); // Should I notify something else here or call a refresh method? } } private bool removeFirstLetter; public bool RemoveFirstLetter { get { return removeFirstLetter; } set { removeFirstLetter = value; NotifyPropertyChanged("RemoveFirstLetter"); // Should I notify something else here or call a refresh method? } } // ... </code></pre> <p>Then I created a Work method in the same ViewModel class at this moment. I ll move this method into the business later.</p> <pre><code>private void Work() { string result = _originalText; if (Upper) result = result.ToUpper(); if (removeFirstLetter) result = result.Substring(1, result.Length); // if ... ModifiedText = result; } </code></pre> <p>My question is when, where should I call the work method? Should I call it in each setter or getter? I dont like the idea. I do something wrong...</p> <p>Thank you.</p>
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