# C1.CalcEngine.ExpressionEngine.LogicalFunctions

## Content

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  <h1 id="C1_CalcEngine_ExpressionEngine_LogicalFunctions" data-uid="C1.CalcEngine.ExpressionEngine.LogicalFunctions" class="text-break">LogicalFunctions Class
</h1>
  <div class="markdown level0 summary"><p>Represents logical functions.</p>
</div>
  <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"><span class="xref">LogicalFunctions</span></div>
  </div>
  <h6><strong>Namespace</strong>: <a class="xref" href="C1.CalcEngine.ExpressionEngine.html">C1.CalcEngine.ExpressionEngine</a></h6>
  <h6><strong>Assembly</strong>: C1.CalcEngine.dll</h6>
  <h5 id="C1_CalcEngine_ExpressionEngine_LogicalFunctions_syntax">Syntax</h5>
  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static class LogicalFunctions</code></pre>
  </div>
  <div class="codewrapper">
    <pre><code class="lang-vbnet hljs">Public Module LogicalFunctions</code></pre>
  </div>
  <h3 id="methods">Methods
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  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
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    <tbody>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_LogicalFunctions_Iif_System_Collections_Generic_List_C1_CalcEngine_ExpressionEngine_IExpression__" data-uid="C1.CalcEngine.ExpressionEngine.LogicalFunctions.Iif(System.Collections.Generic.List{C1.CalcEngine.ExpressionEngine.IExpression})">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.LogicalFunctions.Iif.html#C1_CalcEngine_ExpressionEngine_LogicalFunctions_Iif_System_Collections_Generic_List_C1_CalcEngine_ExpressionEngine_IExpression__">Iif(List&lt;IExpression&gt;)</a>
        </td>
        <td class="markdown level1 summary"><p>Returns the evaluation of one of two expressions, depending on the condition.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_LogicalFunctions_IsNull_System_Collections_Generic_List_C1_CalcEngine_ExpressionEngine_IExpression__" data-uid="C1.CalcEngine.ExpressionEngine.LogicalFunctions.IsNull(System.Collections.Generic.List{C1.CalcEngine.ExpressionEngine.IExpression})">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.LogicalFunctions.IsNull.html#C1_CalcEngine_ExpressionEngine_LogicalFunctions_IsNull_System_Collections_Generic_List_C1_CalcEngine_ExpressionEngine_IExpression__">IsNull(List&lt;IExpression&gt;)</a>
        </td>
        <td class="markdown level1 summary"><p>Returns True if the specified Value is NULL.</p>
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      </tr>
    </tbody>
  </table>

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