public Delegate MakeExpressionProc(int argCount)
{
var args = new ParameterExpression[argCount];
for (var i = 0; i < argCount; ++i)
{
args[i] = Expression.Parameter(typeof(object));
}
var code = AccessorLambdaMetaObject.MakeExpression(Nullable, Members, args);
var proc = Runtime.CompileToDelegate(code, args);
return(proc);
}
object IApply.Apply(object[] args)
{
if (args.Length > 6)
{
var args2 = args.Select(x => (Expression)Expression.Constant(x)).ToArray();
var expr = AccessorLambdaMetaObject.MakeExpression(Nullable, Members, args2);
var proc = Runtime.CompileToFunction(expr);
var val = proc();
return(val);
}
else
{
switch (args.Length)
{
case 0:
{
if (Proc0 == null)
{
Proc0 = (Func <object>)MakeExpressionProc(0);
}
return(Proc0());
}
case 1:
{
if (Proc1 == null)
{
Proc1 = (Func <object, object>)MakeExpressionProc(1);
}
return(Proc1(args[0]));
}
case 2:
{
if (Proc2 == null)
{
Proc2 = (Func <object, object, object>)MakeExpressionProc(2);
}
return(Proc2(args[0], args[1]));
}
case 3:
{
if (Proc3 == null)
{
Proc3 = (Func <object, object, object, object>)MakeExpressionProc(3);
}
return(Proc3(args[0], args[1], args[2]));
}
case 4:
{
if (Proc4 == null)
{
Proc4 = (Func <object, object, object, object, object>)MakeExpressionProc(4);
}
return(Proc4(args[0], args[1], args[2], args[3]));
}
case 5:
{
if (Proc5 == null)
{
Proc5 = (Func <object, object, object, object, object, object>)MakeExpressionProc(1);
}
return(Proc5(args[0], args[1], args[2], args[3], args[4]));
}
case 6:
{
if (Proc6 == null)
{
Proc6 = (Func <object, object, object, object, object, object, object>)MakeExpressionProc(6);
}
return(Proc6(args[0], args[1], args[2], args[3], args[4], args[5]));
}
default:
{
throw new NotImplementedException("Apply supports up to 6 arguments");
}
}
}
}
