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POHow to filter ObservableCollection from various textbox (Multiple Criteria)?
 

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  1. POHow to filter ObservableCollection from various textbox (Multiple Criteria)?
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    <p>I have a <code>ListView</code> that I'm filling with an <code>ObservableCollection</code> </p> <p>I'm filtering the list from text entered in a <code>TextBox</code></p> <p>Here's a section of the code I'm using:</p> <pre><code> private void Filter_TextChanged(object sender, TextChangedEventArgs e) { view = CollectionViewSource.GetDefaultView(Elementos_Lista.ItemsSource); view.Filter = null; view.Filter = new Predicate&lt;object&gt;(FilterList); } </code></pre> <p>This works okay if I want to filter a list by just one criteria, but whenever I want to mix more than 1 textbox to do the filtering it always filters based on the ItemsSource, and not the current result set, meaning that there's no accumulation of criteria.</p> <p>Here's my FilterList method.</p> <pre><code> ItemDetail item = obj as ItemDetail; if (item == null) return false; string textFilter = txtFilter.Text; if (textFilter.Trim().Length == 0) return true; //this returns the unfiltered results. if ((item.problema.ToLower().Contains(textFilter.ToLower()))) return true; return false; </code></pre> <p>Is there a way to filter the ObservableCollection (view) by multiple criteria, that aren't always provided at the same time?.</p> <p>I have tried to change the FilterList method to evaluate various textboxes, but I would have to make an IF statement to check all the possibilities of matching the criteria.</p> <pre><code>(filter1=value , filter2=value) OR (filter1=value , filter2=empty) OR (filter1=empty , filter2=value) </code></pre> <p>And since I'm planning to filter by at least 5 different controls, that wouldn't be fun at all.</p> <p>Example:</p> <pre><code>List: Maria, Age:26 Jesus, Age:15 Angela, Age:15 </code></pre> <p>First Filter</p> <pre><code>Filters: Name: //Empty Age: 15 Result: Jesus, Age:15 Angela, Age:15 </code></pre> <p>Second Filter:</p> <pre><code>Filters: Name: Jesus Age: 15 Result: Jesus, Age:15 </code></pre> <p>What I'm trying to do is to apply filters to the already filtered collection, and not the original one, and this approach overwrites the applied filter with the next one.</p>
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