public static Expression FoldInvocation(InvocationExpression inputExpression)
{
IEnumerable <Expression> args = ConstantFolding.FoldExpressionList(inputExpression.Arguments);
Expression expr = ConstantFolding.Fold(inputExpression.Expression);
Expression resultExpression;
if (args != inputExpression.Arguments || expr != inputExpression.Expression)
{
resultExpression = Expression.Invoke(expr, args);
}
else
{
resultExpression = inputExpression;
}
#if zero
if (!IsConstant(expr))
{
return(retval);
}
// lambdas are constant
#endif
foreach (Expression arg in args)
{
if (!IsConstant(arg))
{
return(resultExpression);
}
}
resultExpression = ExpressionSimplifier.EvaluateToExpression(resultExpression);
return(resultExpression);
}
public static ElementInit FoldElementInitializer(ElementInit inputExpression)
{
ReadOnlyCollection <Expression> arguments = ConstantFolding.FoldExpressionList(inputExpression.Arguments);
if (arguments != inputExpression.Arguments)
{
return(Expression.ElementInit(inputExpression.AddMethod, arguments));
}
return(inputExpression);
}
public static Expression FoldNewArray(NewArrayExpression inputExpression)
{
IEnumerable <Expression> exprs = ConstantFolding.FoldExpressionList(inputExpression.Expressions);
if (exprs != inputExpression.Expressions)
{
if (inputExpression.NodeType == ExpressionType.NewArrayInit)
{
return(Expression.NewArrayInit(inputExpression.Type.GetElementType(), exprs));
}
else
{
return(Expression.NewArrayBounds(inputExpression.Type.GetElementType(), exprs));
}
}
return(inputExpression);
}
public static NewExpression FoldNew(NewExpression inputExpression)
{
IEnumerable <Expression> args = ConstantFolding.FoldExpressionList(inputExpression.Arguments);
if (args != inputExpression.Arguments)
{
if (inputExpression.Members != null)
{
return(Expression.New(inputExpression.Constructor, args, inputExpression.Members));
}
else
{
return(Expression.New(inputExpression.Constructor, args));
}
}
return(inputExpression);
}
public static Expression FoldMethodCall(MethodCallExpression inputExpression)
{
Expression obj = ConstantFolding.Fold(inputExpression.Object);
ReadOnlyCollection <Expression> args = ConstantFolding.FoldExpressionList(inputExpression.Arguments);
Expression resultExpression;
if (obj != inputExpression.Object || args != inputExpression.Arguments)
{
resultExpression = Expression.Call(obj, inputExpression.Method, args);
}
else
{
resultExpression = inputExpression;
}
if (!IsConstant(obj))
{
return(resultExpression);
}
foreach (Expression arg in args)
{
if (!IsConstant(arg))
{
return(resultExpression);
}
}
// skip simplifying .Take(Constant)
if (inputExpression.Method.IsStatic &&
inputExpression.Method.DeclaringType.IsAssignableFrom(typeof(Queryable)) &&
inputExpression.Method.Name.Equals("Take"))
{
return(resultExpression);
}
resultExpression = ExpressionSimplifier.EvaluateToExpression(resultExpression);
return(resultExpression);
}