|
static private BodyOfCatchMustHaveSameTypeAsBodyOfTry ( ) : |
||
| return | ||
//Validate that the body of the try expression must have the same type as the body of every try block.
private static void ValidateTryAndCatchHaveSameType(Type type, Expression tryBody, ReadOnlyCollection <CatchBlock> handlers)
{
Debug.Assert(tryBody != null);
// Type unification ... all parts must be reference assignable to "type"
if (type != null)
{
if (type != typeof(void))
{
if (!TypeUtils.AreReferenceAssignable(type, tryBody.Type))
{
throw Error.ArgumentTypesMustMatch();
}
foreach (CatchBlock cb in handlers)
{
if (!TypeUtils.AreReferenceAssignable(type, cb.Body.Type))
{
throw Error.ArgumentTypesMustMatch();
}
}
}
}
else if (tryBody.Type == typeof(void))
{
//The body of every try block must be null or have void type.
foreach (CatchBlock cb in handlers)
{
Debug.Assert(cb.Body != null);
if (cb.Body.Type != typeof(void))
{
throw Error.BodyOfCatchMustHaveSameTypeAsBodyOfTry();
}
}
}
else
{
//Body of every catch must have the same type of body of try.
type = tryBody.Type;
foreach (CatchBlock cb in handlers)
{
Debug.Assert(cb.Body != null);
if (!TypeUtils.AreEquivalent(cb.Body.Type, type))
{
throw Error.BodyOfCatchMustHaveSameTypeAsBodyOfTry();
}
}
}
}
