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    <p>It is the gibberish at the end, and using <code>Stfld</code> to call a property; I have no idea where that end stuff came from, but I <em>do not</em> believe that came from <code>ExampleMethod</code> - I think that might have been from a previous build of yours. In particular, you haven't defined a second local, so <code>Ldloc_1</code> makes no sense; but there is absolutely no need for any labels / branches here. Here is what I have, that works (note I didn't know what your <code>settableProperties</code> were, so I did it just using <code>FieldInfo</code> / <code>PropertyInfo</code>:</p> <pre><code> var dm = new DynamicMethod(string.Format("Deserialize{0}", Guid.NewGuid()), typeof(object), new[] { typeof(Document) }, true); var il = dm.GetILGenerator(); var ctor = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, Type.EmptyTypes, null); il.DeclareLocal(type); il.Emit(OpCodes.Newobj, ctor); il.Emit(OpCodes.Stloc_0); var getFieldValue = typeof(Document).GetMethod("Get", BindingFlags.Instance | BindingFlags.Public); var fields = type.GetFields(BindingFlags.Public | BindingFlags.Instance); foreach (var field in fields) { il.Emit(OpCodes.Ldloc_0);// [target] il.Emit(OpCodes.Ldarg_0); il.Emit(OpCodes.Ldstr, field.Name); il.Emit(OpCodes.Callvirt, getFieldValue); il.Emit(OpCodes.Stfld, field); } var props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance); foreach (var prop in props) { var setter = prop.GetSetMethod(); if (setter == null) continue; il.Emit(OpCodes.Ldloc_0);// [target] il.Emit(OpCodes.Ldarg_0); il.Emit(OpCodes.Ldstr, prop.Name); il.Emit(OpCodes.Callvirt, getFieldValue); il.EmitCall(OpCodes.Callvirt, setter, null); } il.Emit(OpCodes.Ldloc_0); il.Emit(OpCodes.Ret); return (Func&lt;Document, object&gt;)dm.CreateDelegate(typeof(Func&lt;Document, object&gt;)); </code></pre> <p>And for comparison purposes, here is what I get when looking at <code>ExampleMethod</code> in reflector (in a release build, etc):</p> <pre><code>.method public hidebysig static class PocoObject ExampleMethod(class Document document) cil managed { .maxstack 3 .locals init ( [0] class PocoObject poco) L_0000: newobj instance void PocoObject::.ctor() L_0005: stloc.0 L_0006: ldloc.0 L_0007: ldarg.0 L_0008: ldstr "ID" L_000d: callvirt instance string Document::Get(string) L_0012: stfld string PocoObject::ID L_0017: ldloc.0 L_0018: ldarg.0 L_0019: ldstr "DisplayText" L_001e: callvirt instance string Document::Get(string) L_0023: stfld string PocoObject::DisplayText L_0028: ldloc.0 L_0029: ldarg.0 L_002a: ldstr "PropId" L_002f: callvirt instance string Document::Get(string) L_0034: callvirt instance void PocoObject::set_PropId(string) L_0039: ldloc.0 L_003a: ret } </code></pre> <p>Things to note:</p> <ul> <li>no labels / branching (I have no idea where that came from, but that is not from what you posted)</li> <li>it defines a local</li> <li>no <code>nop</code></li> </ul>
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    1. COThank's Marc! This worked... Also - I put the `nop`s and the branching at the end in there only later just because I was frustrated and wanted to get the IL to be exactly like what I found in ildasm. - no idea why they are there but they look to be useless (changing to release build gets rid of them...). In the end the issue i was having was with the `Ldloc.1` which was copied from sam's code which I mustn't have understood completely. Thanks again.
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    2. COoh and also - i wasn't using `stfld` on properties... i just took out that part of code in my "simplification" that i posted. Cheers.
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