c# - 如何从字典列表中删除项目？

Question

Here is the values I am adding in Dictionary List:-

1,1000
2,2000
1,1000
3,3000

I can delete from Dictionary based on key value:-

if (i == null)
    return;
var dict = app["ItemList"] as Dictionary<int, int>;
if (dict != null)
    dict.Remove(i.ItemId);

Here I pass key value (i.ItemId),it deletes an item from dictionary. But When I use List of Dictionary, I couldn't delete items from List of Dictionary based on Key Value.

if (i == null)
    return;
var dict = app["ItemList"] as List<Dictionary<int, int>>;
if (dict != null)
{
    var itemDict = new Dictionary<int, int>();
    itemDict[i.ItemUid] = 0;
    dict.Remove(itemDict);
}

Note:- I have only Key value available when I am deleting from List of Dictionary.

Help will be appreciated.

Answer 1

Assuming that i.ItemUid is a key:

var dict = app["ItemList"] as List<Dictionary<int, int>>;
if (dict != null)
{
    foreach (var x in dict) x.Remove(i.ItemUid);
}

If instead i.ItemUid is a key-value pair

var dict = app["ItemList"] as List<Dictionary<int, int>>;
if (dict != null)
{
    foreach (var x in dict) x.Remove(i.ItemUid.Key);
}

Edit: total number of keys in all dictionaries:

int totalNumberOfKeys = 0;
foreach (var x in dict) totalNumberOfKeys += x.Count;