CODEWITHSUNDEEP
reflectionreflection.emitmono.cecil
user1934537
user1934537

Reputation: 49

adding a new constructor to "existing" type with mono.cecil

I am trying to add new overloaded constructor to an existing type. I tried to do it with emit namespace, however created type doesnt inherit the base class and all other methods.

And after reading some articles, i decided its not possible with .net framework built-in classes.

So I got Mono.Cecil, but couldnt find any decent example how to achieve this.

I have encountered a sample which copies methods, but not props, fields etc.

Upvotes: 3

Views: 2179

Answers (1)

Simon
Simon

Reputation: 34880

This adds an empty constructor

void AddEmptyConstructor(TypeDefinition type, MethodReference baseEmptyConstructor)
{
    var methodAttributes = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName;
    var method = new MethodDefinition(".ctor", methodAttributes, ModuleDefinition.TypeSystem.Void);
    method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg_0));
    method.Body.Instructions.Add(Instruction.Create(OpCodes.Call, baseEmptyConstructor));
    method.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
    type.Methods.Add(method);
}

You will need to extend it to pass through the extra parameters.

From here

Upvotes: 8

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