# C1.DataFilter.ObservableCollectionBase-1

## Content

<div class="doc-site-dotnet-api-container">



  <h1 id="C1_DataFilter_ObservableCollectionBase_1" data-uid="C1.DataFilter.ObservableCollectionBase`1" class="text-break">ObservableCollectionBase&lt;T&gt; Class
</h1>
  <div class="markdown level0 summary"><p>Represents a collection with the <a class="xref" href="C1.DataFilter.ObservableCollectionBase-1.CollectionResetting.html">CollectionResetting</a> event.</p>
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  <div class="markdown level0 conceptual"></div>
  <div class="inheritance">
    <h5>Inheritance</h5>
    <div class="level0"><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></div>
    <div class="level1"><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1">Collection</a>&lt;T&gt;</div>
    <div class="level2"><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.observablecollection-1">ObservableCollection</a>&lt;T&gt;</div>
    <div class="level3"><span class="xref">ObservableCollectionBase&lt;T&gt;</span></div>
      <div class="level4"><a class="xref" href="C1.DataFilter.ChecklistItemsCollection.html">ChecklistItemsCollection</a></div>
      <div class="level4"><a class="xref" href="C1.DataFilter.FilterCollection.html">FilterCollection</a></div>
  </div>
  <div class="implements">
    <h5>Implements</h5>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;T&gt;</div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.icollection-1">ICollection</a>&lt;T&gt;</div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.ilist">IList</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.icollection">ICollection</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ireadonlylist-1">IReadOnlyList</a>&lt;T&gt;</div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ireadonlycollection-1">IReadOnlyCollection</a>&lt;T&gt;</div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.ienumerable">IEnumerable</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.specialized.inotifycollectionchanged">INotifyCollectionChanged</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.componentmodel.inotifypropertychanged">INotifyPropertyChanged</a></div>
  </div>
  <h6><strong>Namespace</strong>: <a class="xref" href="C1.DataFilter.html">C1.DataFilter</a></h6>
  <h6><strong>Assembly</strong>: C1.Win.DataFilter.4.8.dll</h6>
  <h5 id="C1_DataFilter_ObservableCollectionBase_1_syntax">Syntax</h5>
  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public class ObservableCollectionBase&lt;T&gt; : ObservableCollection&lt;T&gt;, IList&lt;T&gt;, ICollection&lt;T&gt;, IList, ICollection, IReadOnlyList&lt;T&gt;, IReadOnlyCollection&lt;T&gt;, IEnumerable&lt;T&gt;, IEnumerable, INotifyCollectionChanged, INotifyPropertyChanged</code></pre>
  </div>
  <div class="codewrapper">
    <pre><code class="lang-vbnet hljs">Public Class ObservableCollectionBase(Of T)
    Inherits ObservableCollection(Of T)
    Implements IList(Of T), ICollection(Of T), IList, ICollection, IReadOnlyList(Of T), IReadOnlyCollection(Of T), IEnumerable(Of T), IEnumerable, INotifyCollectionChanged, INotifyPropertyChanged</code></pre>
  </div>
  <h5 class="typeParameters">Type Parameters</h5>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td><span class="parametername">T</span></td>
        <td></td>
      </tr>
    </tbody>
  </table>
  <h3 id="constructors">Constructors
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_DataFilter_ObservableCollectionBase_1__ctor" data-uid="C1.DataFilter.ObservableCollectionBase`1.#ctor">
          <a class="xref" href="C1.DataFilter.ObservableCollectionBase-1.-ctor.html#C1_DataFilter_ObservableCollectionBase_1__ctor">ObservableCollectionBase()</a>
        </td>
        <td class="markdown level1 summary"></td>
      </tr>
    </tbody>
  </table>
  <h3 id="methods">Methods
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_DataFilter_ObservableCollectionBase_1_ClearItems" data-uid="C1.DataFilter.ObservableCollectionBase`1.ClearItems">
          <a class="xref" href="C1.DataFilter.ObservableCollectionBase-1.ClearItems.html#C1_DataFilter_ObservableCollectionBase_1_ClearItems">ClearItems()</a>
        </td>
        <td class="markdown level1 summary"><p>Removes all items from the collection.</p>
</td>
      </tr>
    </tbody>
  </table>
  <h3 id="events">Events
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_DataFilter_ObservableCollectionBase_1_CollectionResetting" data-uid="C1.DataFilter.ObservableCollectionBase`1.CollectionResetting">
          <a class="xref" href="C1.DataFilter.ObservableCollectionBase-1.CollectionResetting.html">CollectionResetting</a>
        </td>
        <td class="markdown level1 summary"><p>Occurs before all items are removed.</p>
</td>
      </tr>
    </tbody>
  </table>

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