C# List与Dictionary相互转换与高效查找

Posted 2022-06-05 s0611163

TestModel类定义：

public class TestModel

    public int Id get; set;
    public string Name get; set;
    public string Code get; set;

 

Dictionary与List定义：

List<TestModel> list = new List<TestModel>();
Dictionary<int, TestModel> dict = new Dictionary<int, TestModel>();

 

Dictionary转List：

dict = list.ToLookup(model => model.Id).ToDictionary(model => model.Key, model => model.First());

 

List转Dictionary：

list = dict.Values.ToList();

 

高效查找：

foreach (TestModel item in list)

    if (dict.ContainsKey(item.Id))
   
        TestModel model = dict[item.Id];