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    <p>Any properties that are value-types (<code>int</code> etc) will need boxing; or you will need to use a different <code>Append</code> overload.</p> <p>Also:</p> <ul> <li>you need to load the object each time (arg0)</li> <li><code>StringBuilder.Append</code> is a fluent API; you either need to pop the value, or re-use it:</li> <li>as a consequence, you don't need the field</li> </ul> <p>(personally, though, I'd return a <code>string</code>, but "meh")</p> <p>Like so:</p> <pre><code> DynamicAccessor&lt;T&gt; dynAccessor = new DynamicAccessor&lt;T&gt;(); MethodInfo AppendMethod = typeof(StringBuilder).GetMethod("Append", new[] { typeof(Object) }); //Append method of Stringbuilder var method = new DynamicMethod("ClassWriter", typeof(StringBuilder), new[] { typeof(T) }, typeof(T), true); var generator = method.GetILGenerator(); generator.Emit(OpCodes.Newobj, typeof(StringBuilder).GetConstructor(Type.EmptyTypes)); //make our string builder //iterate through all the instance of T's props and sb.Append their values. PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance); foreach (var info in props) { generator.Emit(OpCodes.Ldarg_0); generator.Emit(OpCodes.Callvirt, info.GetGetMethod()); //call the Getter if (info.PropertyType.IsValueType) { generator.Emit(OpCodes.Box, info.PropertyType); } generator.Emit(OpCodes.Callvirt, AppendMethod); //Call Append } generator.Emit(OpCodes.Ret); //return pointer to sb </code></pre> <p>This generates the equivalent to:</p> <pre><code>StringBuilder ClassWriter(T obj) { return new StringBuilder.Append((object)obj.Foo).Append((object)obj.Bar) .Append((object)obj.Blip).Append((object)obj.Blap); } </code></pre>
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    1. USMarc Gravell
    1. USMarc Gravell
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    1. CO+1, very nicely explained.
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      1. USDarin Dimitrov
    2. COAh thanks, this is a super explanation! I see what you mean by the boxing, I'm so use to the compiler automatically resolving the correct overload to call. I'm not sure what you mean by Append is a fluent API, does that mean that the value that's being appended isn't being consumed from the stack? And where does Ldarg_0 get it's input from? Sorry for all the questions xD
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    3. COby fluent, I mean that Append doesn't return `void` - it returns `this`; you call `.Append(...).Append(...).Append(...)` etc. You were leaving a value on the stack after each call. `arg0` is the input parameter (since this is a static method). For an instance method, `arg0` is "this".
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