# C1.WPF.Binding.C1CalcEngine.RegisterFunction

## Content

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



<h1 id="C1_WPF_Binding_C1CalcEngine_RegisterFunction_" data-uid="C1.WPF.Binding.C1CalcEngine.RegisterFunction*">RegisterFunction Method
</h1>
<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="C1_WPF_Binding_C1CalcEngine_RegisterFunction_" data-uid="C1.WPF.Binding.C1CalcEngine.RegisterFunction*"></a>
<h4 id="C1_WPF_Binding_C1CalcEngine_RegisterFunction_System_String_System_Int32_System_Int32_C1_WPF_Binding_CalcEngineFunction_" data-uid="C1.WPF.Binding.C1CalcEngine.RegisterFunction(System.String,System.Int32,System.Int32,C1.WPF.Binding.CalcEngineFunction)">RegisterFunction(string, int, int, CalcEngineFunction)</h4>
<div class="markdown level1 summary"><p>Registers a function that can be evaluated by this <a class="xref" href="C1.WPF.Binding.C1CalcEngine.html">C1CalcEngine</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public void RegisterFunction(string functionName, int parmMin, int parmMax, CalcEngineFunction fn)</code></pre>
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<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Sub RegisterFunction(functionName As String, parmMin As Integer, parmMax As Integer, fn As CalcEngineFunction)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-condensed">
  <thead>
    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></td>
      <td><span class="parametername">functionName</span></td>
      <td><p>Function name.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">parmMin</span></td>
      <td><p>Minimum parameter count.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">parmMax</span></td>
      <td><p>Maximum parameter count.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="C1.WPF.Binding.CalcEngineFunction.html">CalcEngineFunction</a></td>
      <td><span class="parametername">fn</span></td>
      <td><p>Delegate that evaluates the function.</p>
</td>
    </tr>
  </tbody>
</table>


<a id="C1_WPF_Binding_C1CalcEngine_RegisterFunction_" data-uid="C1.WPF.Binding.C1CalcEngine.RegisterFunction*"></a>
<h4 id="C1_WPF_Binding_C1CalcEngine_RegisterFunction_System_String_System_Int32_C1_WPF_Binding_CalcEngineFunction_" data-uid="C1.WPF.Binding.C1CalcEngine.RegisterFunction(System.String,System.Int32,C1.WPF.Binding.CalcEngineFunction)">RegisterFunction(string, int, CalcEngineFunction)</h4>
<div class="markdown level1 summary"><p>Registers a function that can be evaluated by this <a class="xref" href="C1.WPF.Binding.C1CalcEngine.html">C1CalcEngine</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public void RegisterFunction(string functionName, int parmCount, CalcEngineFunction fn)</code></pre>
</div>
<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Sub RegisterFunction(functionName As String, parmCount As Integer, fn As CalcEngineFunction)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-condensed">
  <thead>
    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></td>
      <td><span class="parametername">functionName</span></td>
      <td><p>Function name.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">parmCount</span></td>
      <td><p>Parameter count.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="C1.WPF.Binding.CalcEngineFunction.html">CalcEngineFunction</a></td>
      <td><span class="parametername">fn</span></td>
      <td><p>Delegate that evaluates the function.</p>
</td>
    </tr>
  </tbody>
</table>
</div>