public override MemberExpression this[string name]
{
get
{
MemberExpression exp = null;
if (Cache.TryGetValue(name, out exp))
{
return(exp);
}
EntityModel model = Runtime.RuntimeContext.Current.GetModelAsync <EntityModel>(ModelID).Result;
EntityMemberModel m = model.GetMember(name, false);
if (m != null)
{
switch (m.Type)
{
case EntityMemberType.DataField:
//case EntityMemberType.Formula:
//case EntityMemberType.Aggregate:
//case EntityMemberType.AutoNumber:
exp = new FieldExpression(name, this);
break;
case EntityMemberType.EntityRef:
var rm = (EntityRefModel)m;
if (!rm.IsAggregationRef)
{
exp = new EntityExpression(name, rm.RefModelIds[0], this);
}
else
{
throw new NotImplementedException("尚未实现聚合引用对象的表达式");
}
break;
case EntityMemberType.EntitySet:
var sm = (EntitySetModel)m;
//EntityRefModel erm = esm.RefModel[esm.RefMemberName] as EntityRefModel;
exp = new EntitySetExpression(name, this, sm.RefModelId);
break;
//case EntityMemberType.AggregationRefField:
// exp = new AggregationRefFieldExpression(name, this);
// break;
default:
throw new NotSupportedException($"EntityExpression.DefaultIndex[]: Not Supported MemberType [{m.Type.ToString()}].");
}
Cache.Add(name, exp);
return(exp);
}
//如果不包含判断是否继承，或EntityRef's DisplayText
//if (name.EndsWith("DisplayText", StringComparison.Ordinal)) //TODO: 暂简单判断
//{
// exp = new FieldExpression(name, this);
// Cache.Add(name, exp);
// return exp;
//}
throw new Exception($"Can not find member [{name}] in [{model.Name}].");
}
}
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
if (ReferenceEquals(this, obj))
{
return(true);
}
EntitySetExpression target = obj as EntitySetExpression;
if (Equals(null, target))
{
return(false);
}
return(Equals(target.Owner, Owner) && target.Name == Name);
}