private Expression MakeEnumLambda(Type type)
{
var p = Expression.Parameter(typeof(string), "s");
var c = ReflectionCacheManager.GetEnumCache(type).Cache;
var fields = c.Fields;
List <SwitchCase> cases = new List <SwitchCase>();
foreach (var f in fields)
{
if (f.Field.FieldType.IsEnum)
{
var val = f.Field.GetValue(null);
var caseConditions = f.Attributes.Where(v => v.Key == typeof(XmlEnumAttribute) || v.Key == typeof(XmlEnumAlternateName))
.SelectMany(a => a.Value).Cast <XmlEnumAttribute>().Select(a => Expression.Constant(a.Name)).ToArray();
if (caseConditions.Length > 0)
{
cases.Add(Expression.SwitchCase(Expression.Constant(val), caseConditions));
}
}
}
var failEnum = XmlExpressionConstants.FailEnum(p, type);
var throwFailEnum = Expression.Throw(failEnum, type);
Expression switchBody;
if (cases.Count > 0)
{
switchBody = Expression.Switch(p, throwFailEnum, cases.ToArray());
}
else
{
switchBody = throwFailEnum;
}
var lambda = Expression.Lambda(
Expression.Block(switchBody),
$"Read{type.Name}",
new[] { p, XmlExpressionConstants.Serializer });
return(XmlSerializerGenerator.LambdaOrDelegate(lambda));
}
private LambdaExpression MakeSwitchLambda(ParameterExpression property, ParameterExpression rawValue)
{
var c = ReflectionCacheManager.GetEnumCache(propertyType).Cache;
var fields = c.Fields;
List <SwitchCase> cases = new List <SwitchCase>();
foreach (var f in fields)
{
if (f.Field.FieldType.IsEnum)
{
var val = f.Field.GetValue(null);
Expression body = GetCaseBody((Enum)val, rawValue);
if (body != null)
{
if (body.NodeType != ExpressionType.Block)
{
body = Expression.Convert(body, typeof(object));
}
cases.Add(Expression.SwitchCase(body, Expression.Constant(val)));
}
}
}
var @default = Expression.Constant(null);
var assignName = XmlExpressionConstants.Serializer_Name(XmlAttributeType.Element).Assign(property.Call("ToString").Call("ToLower"));
var @switch = Expression.Switch(property, @default, cases.ToArray());
return(Expression.Lambda(
Expression.Block(
assignName,
@switch
),
"ReadObjectPropertyInner",
new[] { XmlExpressionConstants.Serializer, property, rawValue }));
}