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using dnlib.DotNet;
using dnlib.DotNet.Emit;
namespace dnlib.Examples {
public class Example2 {
// This will open the current assembly, add a new class and method to it,
// and then save the assembly to disk.
public static void Run() {
// Open the current module
ModuleDefMD mod = ModuleDefMD.Load(typeof(Example2).Module);
// Create a new public class that derives from System.Object
TypeDef type1 = new TypeDefUser("My.Namespace", "MyType",
mod.CorLibTypes.Object.TypeDefOrRef);
type1.Attributes = TypeAttributes.Public | TypeAttributes.AutoLayout |
TypeAttributes.Class | TypeAttributes.AnsiClass;
// Make sure to add it to the module or any other type in the module. This is
// not a nested type, so add it to mod.Types.
mod.Types.Add(type1);
// Create a public static System.Int32 field called MyField
FieldDef field1 = new FieldDefUser("MyField",
new FieldSig(mod.CorLibTypes.Int32),
FieldAttributes.Public | FieldAttributes.Static);
// Add it to the type we created earlier
type1.Fields.Add(field1);
// Add a static method that adds both inputs and the static field
// and returns the result
MethodImplAttributes methImplFlags = MethodImplAttributes.IL | MethodImplAttributes.Managed;
MethodAttributes methFlags = MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.HideBySig | MethodAttributes.ReuseSlot;
MethodDef meth1 = new MethodDefUser("MyMethod",
MethodSig.CreateStatic(mod.CorLibTypes.Int32, mod.CorLibTypes.Int32, mod.CorLibTypes.Int32),
methImplFlags, methFlags);
type1.Methods.Add(meth1);
// Create the CIL method body
CilBody body = new CilBody();
meth1.Body = body;
// Name the 1st and 2nd args a and b, respectively
meth1.ParamDefs.Add(new ParamDefUser("a", 1));
meth1.ParamDefs.Add(new ParamDefUser("b", 2));
// Create a local. We don't really need it but let's add one anyway
Local local1 = new Local(mod.CorLibTypes.Int32);
body.Variables.Add(local1);
// Add the instructions, and use the useless local
body.Instructions.Add(OpCodes.Ldarg_0.ToInstruction());
body.Instructions.Add(OpCodes.Ldarg_1.ToInstruction());
body.Instructions.Add(OpCodes.Add.ToInstruction());
body.Instructions.Add(OpCodes.Ldsfld.ToInstruction(field1));
body.Instructions.Add(OpCodes.Add.ToInstruction());
body.Instructions.Add(OpCodes.Stloc.ToInstruction(local1));
body.Instructions.Add(OpCodes.Ldloc.ToInstruction(local1));
body.Instructions.Add(OpCodes.Ret.ToInstruction());
// Save the assembly to a file on disk
mod.Write(@"C:\saved-assembly.dll");
}
}
}
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