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IlGenerator Emit


By : user2174691
Date : October 17 2020, 08:10 AM
may help you . I'm playing around with DynamicMethod and trying to use IL to create some objects. I want to create the following very basic object: ,
What am I doing wrong?
code :
ilGen.Emit(OpCodes.Ldc_R8, 100);
ilGen.Emit(OpCodes.Ldc_R8, (double)100); // or 100d
ilGen.Emit(OpCodes.Pop);


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Reflection.Emit.ILGenerator::Emit, call method from third party .net library


By : Ginaroach
Date : March 29 2020, 07:55 AM
like below fixes the issue I'm trying to create simple .net compiler for educational purposes. After parsing, scanning and building AST I'm generating .net assembly using Reflection.Emit.ILGenerator. , The only change here is the target method:
code :
var targetMethod = Assembly.LoadFrom("ThirdPartyLibrary.dll")
    .GetType("ThirdPartyLibrary.MyPrint")
    .GetMethod("Print", new [] {typeof(string)});
...
il.Emit(OpCodes.Ldstr, "Test!");
il.Emit(OpCodes.Call, targetMethod);
il.Emit(OpCodes.Ret);

Setting an object's sub property using ILGenerator.Emit


By : Phạm Kent
Date : March 29 2020, 07:55 AM
With these it helps I have some code that uses IlGenerator.Emit to create and populate a generic object using a datareader. It works great however I need to extend it to populate simple child objects when the database field name contains an underscore. , Code like this:
code :
static Entity DynamicCreate(IDataReader reader)
{
    var entity = new Entity();
    entity.Property = (int)reader[0];
    return entity;
}
ldloc.0     // entity
ldarg.0     // reader
ldc.i4.0    
callvirt    System.Data.IDataRecord.get_Item
unbox.any   System.Int32
callvirt    UserQuery+Entity.set_Property
static Entity DynamicCreate(IDataReader reader)
{
    var entity = new Entity();
    entity.SubEntity.Property = (int)reader[0];
    return entity;
}
ldloc.0     // entity
callvirt    UserQuery+Entity.get_SubEntity
ldarg.0     // reader
ldc.i4.0    
callvirt    System.Data.IDataRecord.get_Item
unbox.any   System.Int32
callvirt    UserQuery+SubEntity.set_Property
entity.Property = ((int)reader[0]).SubEntity;

Why does ILGenerator.Emit() insert nop opcodes in dynamic assembly?


By : Roberto Salas
Date : March 29 2020, 07:55 AM
I wish this help you As indicated in the comments, for the Ldarg, Stloc and Ldloc opcodes, you should be using the Emit overload that accepts a short as the second parameter, whereas your Index is presumably an int, so the wrong Emit overload is being used. The IL generator doesn't check this, and just outputs all 4 bytes of the value to the IL stream. The 2 high-order bytes are zero, which is nop in IL, hence the nops in your disassembly.
Either change the type of Index to a short or cast it when passing to Emit.

How to call a 'normal' method through ILGenerator.Emit*?


By : Ranz Prajapati
Date : March 29 2020, 07:55 AM
To fix this issue Is it possible for a DynamicMethod to call (via ILGenerator.EmitCall -- or similar -- for instance) a 'normal' method, e.g. Private Sub BlahBlah(ByVal obj as Object)?

Using ILGenerator.Emit to call a method in another assembly that has an out parameter


By : Stephany Pintado
Date : March 29 2020, 07:55 AM
To fix this issue Got it! Had to re-assign the local variable to the out variable in my argument array. Final code below
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