[英]Nested foreach to LINQ in multi-level dictionary
I would like to simplify below nested foreach loops using LINQ but couldn't figure out the way. 我想在下面使用LINQ简化嵌套的foreach循环,但找不到答案。 I guess I can use SelectMany using lambda but not sure. 我想我可以使用lambda来使用SelectMany,但不确定。 I want to create list of objects of ClassA after this nested iteration. 我想在此嵌套迭代之后创建ClassA对象的列表。 Any help is appreciated: 任何帮助表示赞赏:
public List<ClassA> GetLists(Dictionary<string, Dictionary<IEnumerable, Dictionary<string, ClassB>>> groups)
{
var retOutput = new List<ClassA>();
foreach (KeyValuePair<string, Dictionary<IEnumerable, Dictionary<string, ClassB>>> group1 in groups)
{
foreach (KeyValuePair<IEnumerable, Dictionary<string, ClassB>> group2 in group1.Value)
{
foreach (KeyValuePair<string, ClassB> group3 in group2.Value)
{
GetList(retOutput, group1.Key,
group2.Key,
group3);
}
}
}
return retOutput;
}
private static void GetList(List<ClassA> retOutput,
string group1Key,
IEnumerable group2Key,
KeyValuePair<string, ClassB> group3)
{
List<List<string>> itemIdsLists = group3.Value.ItemId.IntoChunks(2000);
foreach (var itemIdList in itemIdsLists)
{
var currentRequest = new ClassA
{
TransactionType = group1Key,
Filters = new Dictionary<string, object>(),
ItemIds = new List<string>(),
PropStreamsDict = new Dictionary<string, Tuple<long, string>>()
};
if (group2Key is Dictionary<string, object>)
{
currentRequest.Filters = (Dictionary<string, object>)group2Key;
}
currentRequest.PropStreamsDict.Add(group3.Key, Tuple.Create(group3.Value.StreamId,
group3.Value.Uom));
currentRequest.ItemIds.AddRange(itemIdList);
retOutput.Add(currentRequest);
}
}
You should use SelectMany
to make nested foreach
. 您应该使用SelectMany
来嵌套foreach
。
Here what I come up with: 这是我想出的:
public List<ClassA> GetLists(Dictionary<string, Dictionary<IEnumerable, Dictionary<string, ClassB>>> groups)
{
return groups
.SelectMany(grp1 => grp1.Value
.SelectMany(grp2 => grp2.Value
.SelectMany(grp3 => grp3.Value.ItemId
.IntoChunks(2000)
.Select(itemIdList =>
new ClassA
{
TransactionType = grp1.Key,
Filters = grp2.Key is Dictionary<string, object> ?
(Dictionary<string, object>)grp2.Key :
new Dictionary<string, object>(),
ItemIds = new List<string>(itemIdList),
PropStreamsDict = new Dictionary<string, Tuple<long, string>>
{
{ grp3.Key, Tuple.Create(grp3.Value.StreamId, grp3.Value.Uom) }
}
}
)
)
)
)
.ToList();
}
You didn't post your ClassA
and ClassB
so I had to guess. 您没有发布ClassA
和ClassB
所以我不得不猜测。
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