C＃清除原始对象时，为什么我的列表项被清空了？(C# Why are my list items being emptied when I clear the original object?)

 我基本上有一个字典列表，如： 
 
List<Dictionary<string, string>>
 
 出于测试的目的，我将36个字典项提取到列表中，然后在我的函数结束时返回列表。 
 
 奇怪的是当我填充列表时，我可以看到在Visual Studio Inspector中添加到列表中的字典的Key => Value对，但是在清除用于填充列表的原始字典时，剩下的只剩下36个。列表中的空项目。 
 
 是否有一些奇怪的List行为发生，我不知道？ 下面包含代码片段以供参考... 
 
    List<Dictionary<string, string>> allResults = new List<Dictionary<string, string>>();
    Dictionary<string, string> selectResult = new Dictionary<string, string>();

    MySqlCommand cmd = new MySqlCommand(query, conn);
    MySqlDataReader dataReader = cmd.ExecuteReader();

    try
    {
        while (dataReader.Read())
        {
            for (int i = 0; i < dataReader.FieldCount; i++)
            {
                selectResult.Add(dataReader.GetName(i).ToString(), dataReader.GetValue(i).ToString());
            }
            allResults.Add(selectResult);

            //Something to do with this next line seems to cause the List to also lose the values stored in the Dictionary, is clearing the dictionary not allowed at this point and the list is simply referencing the Dictionary rather than 'making a copy'?
            selectResult.Clear();
        }
        dataReader.Close();
    }

    catch { }

    this.Close();

    return allResults;

I basically have a list of Dictionaries like:
 
List<Dictionary<string, string>>
 
For the purposes of testing I'm fetching 36 dictionary items into the list and then returning the list at the end of my function.
 
The odd thing is when I populate the list, I can see the Key=>Value pairs of the dictionaries being added to the list in the Visual Studio Inspector, however upon clearing the original dictionary used to populate my list, all that remains is 36 empty items in the list.
 
Is there some weird List behaviour happening that I'm unaware of? A code snip is included below for reference...
 
    List<Dictionary<string, string>> allResults = new List<Dictionary<string, string>>();
    Dictionary<string, string> selectResult = new Dictionary<string, string>();

    MySqlCommand cmd = new MySqlCommand(query, conn);
    MySqlDataReader dataReader = cmd.ExecuteReader();

    try
    {
        while (dataReader.Read())
        {
            for (int i = 0; i < dataReader.FieldCount; i++)
            {
                selectResult.Add(dataReader.GetName(i).ToString(), dataReader.GetValue(i).ToString());
            }
            allResults.Add(selectResult);

            //Something to do with this next line seems to cause the List to also lose the values stored in the Dictionary, is clearing the dictionary not allowed at this point and the list is simply referencing the Dictionary rather than 'making a copy'?
            selectResult.Clear();
        }
        dataReader.Close();
    }

    catch { }

    this.Close();

    return allResults;

原文：https://stackoverflow.com/questions/15574542