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<title>Class FanucIfThen | HiAPI-C# 2025 </title>
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<meta name="description" content="Fanuc Custom Macro B IF [&lt;cond&gt;] THEN &lt;body&gt; single-block conditional record. Stamped on the host block by after the gate decision; produced earlier by as a parsing-stage sub-section (Parsing.FanucIfThen) carrying the raw captured fields plus an internal PendingAssignments sub-object harvested from the body text. Spec: IF [bool-expr] THEN &lt;stmt&gt; executes &lt;stmt&gt; only when the condition is truthy. Unlike 's conditional form there is no jump — the body affects the current block only, no source splice, no label scan, no iteration watchdog. The most common body shape is a single Custom Macro B assignment (#nnn = &lt;expr&gt;); multiple assignments in one body are also accepted and lifted together. is held as a string at parsing time so 's pass-2 tree walk can substitute it to a numeric in place; the FanucIfThenSyntax tail then reads the resolved node polymorphically via the same ReadCondition shape used by .">
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<article data-uid="Hi.NcParsers.Keywords.FanucIfThen">
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<h1 id="Hi_NcParsers_Keywords_FanucIfThen" data-uid="Hi.NcParsers.Keywords.FanucIfThen" class="text-break">
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Class FanucIfThen
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</h1>
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<div class="facts text-secondary">
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<dl><dt>Namespace</dt><dd><a class="xref" href="Hi.html">Hi</a>.<a class="xref" href="Hi.NcParsers.html">NcParsers</a>.<a class="xref" href="Hi.NcParsers.Keywords.html">Keywords</a></dd></dl>
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<dl><dt>Assembly</dt><dd>HiMech.dll</dd></dl>
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</div>
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<div class="markdown summary"><p>Fanuc Custom Macro B <code>IF [<cond>] THEN <body></code>
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single-block conditional record. Stamped on the host block by
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<a class="xref" href="Hi.NcParsers.EvaluationSyntaxs.Fanuc.FanucIfThenSyntax.html">FanucIfThenSyntax</a> after the gate
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decision; produced earlier by
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<a class="xref" href="Hi.NcParsers.ParsingSyntaxs.Fanuc.FanucIfThenParsingSyntax.html">FanucIfThenParsingSyntax</a> as a parsing-stage
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sub-section (<code>Parsing.FanucIfThen</code>) carrying the raw captured fields
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plus an internal <code>PendingAssignments</code> sub-object harvested from the
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body text.</p>
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<p>
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Spec: <code>IF [bool-expr] THEN <stmt></code> executes <code><stmt></code>
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only when the condition is truthy. Unlike <a class="xref" href="Hi.NcParsers.Keywords.FanucGoto.html">FanucGoto</a>'s
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conditional form there is no jump — the body affects the current block
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only, no source splice, no label scan, no iteration watchdog. The most
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common body shape is a single Custom Macro B assignment
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(<code>#nnn = <expr></code>); multiple assignments in one body are also
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accepted and lifted together.
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</p>
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<p>
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<a class="xref" href="Hi.NcParsers.Keywords.FanucIfThen.html#Hi_NcParsers_Keywords_FanucIfThen_Condition">Condition</a> is held as a string at parsing time so
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<a class="xref" href="Hi.NcParsers.EvaluationSyntaxs.VariableEvaluatorSyntax.html">VariableEvaluatorSyntax</a>'s pass-2 tree walk can substitute
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it to a numeric <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.text.json.nodes.jsonvalue">JsonValue</a> in place;
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the FanucIfThenSyntax tail then reads the resolved node polymorphically
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via the same <code>ReadCondition</code> shape used by
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<a class="xref" href="Hi.NcParsers.EvaluationSyntaxs.Fanuc.FanucGotoSyntax.html">FanucGotoSyntax</a>.
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</p>
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</div>
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<div class="markdown conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public class FanucIfThen</code></pre>
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</div>
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<dl class="typelist inheritance">
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<dt>Inheritance</dt>
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<dd>
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<div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></div>
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<div><span class="xref">FanucIfThen</span></div>
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</dd>
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</dl>
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<dl class="typelist inheritedMembers">
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<dt>Inherited Members</dt>
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<dd>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">object.Equals(object)</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)">object.Equals(object, object)</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gethashcode">object.GetHashCode()</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gettype">object.GetType()</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone">object.MemberwiseClone()</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.referenceequals">object.ReferenceEquals(object, object)</a>
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</div>
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<div>
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.tostring">object.ToString()</a>
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</div>
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</dd></dl>
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<dl class="typelist extensionMethods">
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<dt>Extension Methods</dt>
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<dd>
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<div>
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<a class="xref" href="Hi.Common.DuplicateUtil.html#Hi_Common_DuplicateUtil_TryDuplicate__1___0_System_Object___">DuplicateUtil.TryDuplicate<TSelf>(TSelf, params object[])</a>
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</div>
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<div>
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<a class="xref" href="Hi.Common.InvokeUtil.html#Hi_Common_InvokeUtil_SelfInvoke__1___0_System_Action___0__">InvokeUtil.SelfInvoke<TSrc>(TSrc, Action<TSrc>)</a>
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</div>
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<div>
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<a class="xref" href="Hi.Common.InvokeUtil.html#Hi_Common_InvokeUtil_SelfInvoke__2___0_System_Func___0___1__">InvokeUtil.SelfInvoke<TSrc, TDst>(TSrc, Func<TSrc, TDst>)</a>
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</div>
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<div>
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<a class="xref" href="Hi.Coloring.ColorUtil.html#Hi_Coloring_ColorUtil_GetGloomyColor_System_Object_System_Double_System_Double_">ColorUtil.GetGloomyColor(object, double, double)</a>
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</div>
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<div>
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<a class="xref" href="Hi.Common.NameUtil.html#Hi_Common_NameUtil_GetSelectionName_System_Object_">NameUtil.GetSelectionName(object)</a>
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</div>
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<div>
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<a class="xref" href="Hi.Common.StringUtil.html#Hi_Common_StringUtil_GetPropertyStringIfToStringNotOverloaded_System_Object_System_Boolean_System_Boolean_">StringUtil.GetPropertyStringIfToStringNotOverloaded(object, bool, bool)</a>
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</div>
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<div>
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<a class="xref" href="Hi.Parallels.LockUtil.html#Hi_Parallels_LockUtil_Lock_System_Object_">LockUtil.Lock(object)</a>
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</div>
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</dd></dl>
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<h2 class="section" id="properties">Properties
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</h2>
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<a id="Hi_NcParsers_Keywords_FanucIfThen_Applied_" data-uid="Hi.NcParsers.Keywords.FanucIfThen.Applied*"></a>
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<h3 id="Hi_NcParsers_Keywords_FanucIfThen_Applied" data-uid="Hi.NcParsers.Keywords.FanucIfThen.Applied">
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Applied
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</h3>
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<div class="markdown level1 summary"><p>Whether the body actually fired on this block. False on conditions
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that evaluated to zero, on conditions the evaluator could not
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resolve, and on bodies that did not parse as one or more assignments
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(a G-code-only body for example, currently unsupported and warned).
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The host block is preserved in either case so diagnostic readers can
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still see the IF-THEN call site.</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public bool Applied { get; set; }</code></pre>
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</div>
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<h4 class="section">Property Value</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></dt>
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<dd></dd>
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</dl>
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<a id="Hi_NcParsers_Keywords_FanucIfThen_BodyText_" data-uid="Hi.NcParsers.Keywords.FanucIfThen.BodyText*"></a>
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<h3 id="Hi_NcParsers_Keywords_FanucIfThen_BodyText" data-uid="Hi.NcParsers.Keywords.FanucIfThen.BodyText">
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BodyText
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</h3>
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<div class="markdown level1 summary"><p>Raw body text after the <code>THEN</code> keyword, retained verbatim for
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diagnostics and round-trip visibility. The structured sub-section
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actually lifted on a truthy condition lives at
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<code>Parsing.FanucIfThen.PendingAssignments</code>, populated by the
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parsing syntax via <a class="xref" href="Hi.NcParsers.Syntaxs.NcSyntaxUtil.html">NcSyntaxUtil</a>'s
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<code>GrabTagAssignment</code>.</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public string BodyText { get; set; }</code></pre>
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</div>
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<h4 class="section">Property Value</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
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<dd></dd>
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</dl>
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<a id="Hi_NcParsers_Keywords_FanucIfThen_Condition_" data-uid="Hi.NcParsers.Keywords.FanucIfThen.Condition*"></a>
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<h3 id="Hi_NcParsers_Keywords_FanucIfThen_Condition" data-uid="Hi.NcParsers.Keywords.FanucIfThen.Condition">
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Condition
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</h3>
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<div class="markdown level1 summary"><p>Raw boolean expression text from inside the <code>IF [...]</code> brackets
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at Parsing time; substituted to a numeric
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<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.text.json.nodes.jsonvalue">JsonValue</a> in place by
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<a class="xref" href="Hi.NcParsers.EvaluationSyntaxs.VariableEvaluatorSyntax.html">VariableEvaluatorSyntax</a>'s pass-2 tree
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walk when the expression evaluates successfully. The original text
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survives at <code>Formula.FanucIfThen.Condition</code>. Note: not written
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on the host-level stamp; the gate outcome lives at
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<a class="xref" href="Hi.NcParsers.Keywords.FanucIfThen.html#Hi_NcParsers_Keywords_FanucIfThen_ConditionEvaluated">ConditionEvaluated</a>.</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public string Condition { get; set; }</code></pre>
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</div>
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<h4 class="section">Property Value</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
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<dd></dd>
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</dl>
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<a id="Hi_NcParsers_Keywords_FanucIfThen_ConditionEvaluated_" data-uid="Hi.NcParsers.Keywords.FanucIfThen.ConditionEvaluated*"></a>
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<h3 id="Hi_NcParsers_Keywords_FanucIfThen_ConditionEvaluated" data-uid="Hi.NcParsers.Keywords.FanucIfThen.ConditionEvaluated">
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ConditionEvaluated
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</h3>
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<div class="markdown level1 summary"><p>Tri-state outcome of evaluating the IF-form's boolean condition,
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stamped on the host block by
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<a class="xref" href="Hi.NcParsers.EvaluationSyntaxs.Fanuc.FanucIfThenSyntax.html">FanucIfThenSyntax</a>:</p>
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<ul><li><code>true</code> — condition met (body fires).</li><li><code>false</code> — condition not met (body skipped silently).</li><li><code>null</code> — evaluator could not produce a finite truth
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value (vacant variable, parse error, NaN / ±∞).</li></ul>
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The original expression text is preserved at
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<code>Formula.FanucIfThen.Condition</code> by
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<a class="xref" href="Hi.NcParsers.EvaluationSyntaxs.VariableEvaluatorSyntax.html">VariableEvaluatorSyntax</a>.
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</div>
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<div class="markdown level1 conceptual"></div>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public bool? ConditionEvaluated { get; set; }</code></pre>
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</div>
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<h4 class="section">Property Value</h4>
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<dl class="parameters">
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<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a>?</dt>
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<dd></dd>
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</dl>
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</article>
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