[英]Nested foreach to LINQ in multi-level dictionary
我想在下面使用LINQ簡化嵌套的foreach循環,但找不到答案。 我想我可以使用lambda來使用SelectMany,但不確定。 我想在此嵌套迭代之后創建ClassA對象的列表。 任何幫助表示贊賞:
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);
}
}
您應該使用SelectMany
來嵌套foreach
。
這是我想出的:
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();
}
您沒有發布ClassA
和ClassB
所以我不得不猜測。
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