public void Type_Convert()
{
MyValue my = new MyValue("a");
string myStr = my;
Assert.AreEqual("a", myStr);
my = myStr;
Assert.AreEqual("a", my.Value);
MyValue2 my2 = new MyValue2("a2");
myStr = my2;
//my2 = myStr;//can't convert
Assert.AreEqual("a2", myStr);
MyValue3 my3 = myStr;
myStr = my3;
Func <object, Type, object> convert = (value, toType) =>
{
Type fromType = value.GetType();
InvocationDelegate eval;
var compile = new CompileContext();
compile.OverrideOperator(typeof(MyValue));
compile.AddVariable(fromType, "a");
using (compile.BeginScope())
{
var expr = Convert(Variable(fromType, "a"), toType);
eval = compile.Compile(expr);
}
ExpressionContext ctx = new ExpressionContext();
ctx.AddVariable(fromType, "a");
ctx.SetVariable("a", value);
return(eval(ctx));
};
object result;
result = convert(new MyValue("Hello World"), typeof(string));
Assert.AreEqual("Hello World", result);
result = convert("Hello World", typeof(MyValue));
Assert.AreEqual("Hello World", ((MyValue)result).Value);
result = convert(new MyValue2("Hello World"), typeof(string));
Assert.AreEqual("Hello World", result);
try
{
result = convert("Hello World", typeof(MyValue2));
Assert.AreEqual("Hello World", ((MyValue2)result).Value);
Assert.Fail();
}
catch (OperatorNotImplementedException ex) { }
result = convert(new MyValue3("Hello World"), typeof(string));
Assert.AreEqual("Hello World", result);
result = convert("Hello World", typeof(MyValue3));
Assert.AreEqual("Hello World", ((MyValue3)result).Value);
}