/// <summary>
/// 创建数据项。
/// </summary>
/// <param name="reader">数据读取器。</param>
/// <param name="parent">如果是导航属性则为父级对象</param>
/// <returns>创建结果。</returns>
protected object CreateItem(DbDataReader reader, OutputContentItem parent = null)
{
if (_Children.Count == 0 && !HasCollectionProperty)
{
return(Metadata.CreateInstance(reader, ItemFields, EmptyComplexObjects));
}
else
{
var complexs = new object[Metadata.ComplexMembers.Count];
foreach (var item in Children.OfType <ComplexOutputInfo>())
{
if (item.Type == EOutputType.Object)
{
complexs[item.Index] = item.CreateItem(reader, parent);
}
else
{
var propertyMember = item.Parent.Metadata.ComplexMembers[item.Index];
var propertyType = ((PropertyInfo)propertyMember.Member).PropertyType;
if (propertyType.IsInterface)
{
if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(IGrouping <,>))
{
var collectionType = typeof(GroupCollectionImpl <,>).MakeGenericType(propertyType.GetGenericArguments());
complexs[item.Index] = Activator.CreateInstance(collectionType);
}
else
{
var collectionType = typeof(HashSet <>).MakeGenericType(item.Metadata.ClrType);
complexs[item.Index] = Activator.CreateInstance(collectionType);
}
}
else if (propertyType.IsClass)
{
complexs[item.Index] = Activator.CreateInstance(propertyType);
}
else
{
throw new OutputException(this, string.Format(Res.NotSupportedInstanceType, propertyType));
}
parent.Collections.Add((CollectionOutputInfo)item, new OutputContentCollection((CollectionOutputInfo)item, complexs[item.Index]));
}
}
return(Metadata.CreateInstance(reader, ItemFields, complexs));
}
}
//注册使用内容项，用于生成集合属性用。
private void RegisterItem(DbDataReader reader, OutputContentCollection collection)
{
string key = string.Join("_", ItemKeyFields.Select(a => reader.GetValue(a).ToString()).ToArray());
if (!collection.TryGetValue(key, out OutputContentItem item))
{
item = new OutputContentItem();
var content = CreateItem(reader, item);
if (content != null)
{
item.Content = content;
collection.Add(key, item);
}
}
foreach (var kv in item.Collections)
{
kv.Key.RegisterItem(reader, kv.Value);
}
}
/// <summary>
/// 添加指定键值及输出内容项。
/// </summary>
/// <param name="key">键值。</param>
/// <param name="value">关联输出内容项。</param>
public void Add(string key, OutputContentItem value)
{
KeyCollection.Add(key, value);
Output.Metadata.CollectionAdd(Target, value.Content);
}
/// <summary>
/// 使用指定的键值获取输出内容项。
/// </summary>
/// <param name="key">当前键值。</param>
/// <param name="value">获取的内容项。</param>
/// <returns>是否执行成功。</returns>
public bool TryGetValue(string key, out OutputContentItem value)
{
return(KeyCollection.TryGetValue(key, out value));
}