public void TestExpression()
{
var name = new AssemblyName("TestAssembly");
var assembly = AssemblyBuilder.DefineDynamicAssembly(name, AssemblyBuilderAccess.Run);
var module = assembly.DefineDynamicModule("TestAssembly.dll");
var myClass = module.DefineType("MyClass");
var myField = myClass.DefineField("MyField", typeof(long), FieldAttributes.Public);
var myMethod = myClass.DefineMethod("MyMethod", MethodAttributes.Public, CallingConventions.HasThis, typeof(long), new Type[0]);
var expression = new Expression.Operation.Binary()
{
LeftOperand = new Expression.Parameter("Input"),
RightOperand = new Expression.Literal(10000),
Operator = new Syntax.Operator.Numerical.Addition()
};
var state = new ExpressionWriter.State()
{
FieldByName = new Dictionary <string, FieldInfo>()
{
["Input"] = myField
},
ArgumentsByName = new Dictionary <string, int>()
};
var generator = myMethod.GetILGenerator();
var writer = new ExpressionWriter(generator, state);
writer.WriteExpression(expression);
generator.Emit(OpCodes.Ret);
var myClassInfo = myClass.CreateType();
var myFieldInfo = myClass.GetField("MyField");
var myMethodInfo = myClassInfo.GetMethods()[0];
var myClassInstance = Activator.CreateInstance(myClass);
myFieldInfo.SetValue(myClassInstance, 3);
var output = myMethodInfo.Invoke(myClassInstance, new object[0]);
Assert.AreEqual(output, 10003);
}
