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Andreas Pardeike
202 lines
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202 lines
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<title>Class MethodInvoker
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<article class="content wrap" id="_content" data-uid="HarmonyLib.MethodInvoker">
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<h1 id="HarmonyLib_MethodInvoker" data-uid="HarmonyLib.MethodInvoker" class="text-break">Class MethodInvoker
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</h1>
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<div class="markdown level0 summary"><p>A helper class to invoke method with delegates</p>
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</div>
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<div class="markdown level0 conceptual"></div>
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<div class="inheritance">
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<h5>Inheritance</h5>
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<div class="level0"><span class="xref">System.Object</span></div>
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<div class="level1"><span class="xref">MethodInvoker</span></div>
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</div>
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<h6><strong>Namespace</strong>: <a class="xref" href="HarmonyLib.html">HarmonyLib</a></h6>
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<h6><strong>Assembly</strong>: 0Harmony.dll</h6>
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<h5 id="HarmonyLib_MethodInvoker_syntax">Syntax</h5>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public static class MethodInvoker</code></pre>
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</div>
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<h3 id="methods">Methods
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</h3>
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<a id="HarmonyLib_MethodInvoker_GetHandler_" data-uid="HarmonyLib.MethodInvoker.GetHandler*"></a>
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<h4 id="HarmonyLib_MethodInvoker_GetHandler_System_Reflection_MethodInfo_System_Boolean_" data-uid="HarmonyLib.MethodInvoker.GetHandler(System.Reflection.MethodInfo,System.Boolean)">GetHandler(MethodInfo, Boolean)</h4>
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<div class="markdown level1 summary"><p>Creates a fast invocation handler from a method</p>
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</div>
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<div class="markdown level1 conceptual"></div>
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<h5 class="decalaration">Declaration</h5>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">public static FastInvokeHandler GetHandler(MethodInfo methodInfo, bool directBoxValueAccess = false)</code></pre>
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</div>
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<h5 class="parameters">Parameters</h5>
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<table class="table table-bordered table-striped table-condensed">
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<thead>
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<tr>
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<th>Type</th>
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<th>Name</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><span class="xref">System.Reflection.MethodInfo</span></td>
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<td><span class="parametername">methodInfo</span></td>
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<td><p>The method to invoke</p>
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</td>
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</tr>
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<tr>
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<td><span class="xref">System.Boolean</span></td>
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<td><span class="parametername">directBoxValueAccess</span></td>
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<td><p>Controls if boxed value object is accessed/updated directly</p>
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</td>
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</tr>
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</tbody>
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</table>
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<h5 class="returns">Returns</h5>
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<table class="table table-bordered table-striped table-condensed">
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<thead>
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<tr>
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<th>Type</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><a class="xref" href="HarmonyLib.FastInvokeHandler.html">FastInvokeHandler</a></td>
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<td><p>The <a class="xref" href="HarmonyLib.FastInvokeHandler.html">FastInvokeHandler</a></p>
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</td>
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</tr>
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</tbody>
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</table>
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<h5 id="HarmonyLib_MethodInvoker_GetHandler_System_Reflection_MethodInfo_System_Boolean__remarks">Remarks</h5>
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<div class="markdown level1 remarks"><p>
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The <code>directBoxValueAccess</code> option controls how value types passed by reference (e.g. ref int, out my_struct) are handled in the arguments array
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passed to the fast invocation handler.
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Since the arguments array is an object array, any value types contained within it are actually references to a boxed value object.
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Like any other object, there can be other references to such boxed value objects, other than the reference within the arguments array.
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<example>For example,
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<pre><code>var val = 5;
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var box = (object)val;
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var arr = new object[] { box };
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handler(arr); // for a method with parameter signature: ref/out/in int</code></pre></example></p>
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<p>
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If <code>directBoxValueAccess</code> is <code>true</code>, the boxed value object is accessed (and potentially updated) directly when the handler is called,
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such that all references to the boxed object reflect the potentially updated value.
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In the above example, if the method associated with the handler updates the passed (boxed) value to 10, both <code>box</code> and <code>arr[0]</code>
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now reflect the value 10. Note that the original <code>val</code> is not updated, since boxing always copies the value into the new boxed value object.
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</p>
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<p>
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If <code>directBoxValueAccess</code> is <code>false</code> (default), the boxed value object in the arguments array is replaced with a "reboxed" value object,
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such that potential updates to the value are reflected only in the arguments array.
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In the above example, if the method associated with the handler updates the passed (boxed) value to 10, only <code>arr[0]</code> now reflects the value 10.
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