Question

c#: 如何清空Dictionary中的所有的value?

Answer 1

两年之后回来优化了:
var keys = dictionary.Keys.ToList();
foreach(var key in keys)
{
dictionary[key] = null;

}
dictionary.Clear();
================ 原回答：================
查了一圈没一个靠谱的，自己摸索出来了
foreach(var item in dictionary.ToList())
{
dictionary[item.Key]=null;
}

Answer 2

Dictionary<String, Int> strDict = new Dictionary<>();
strDict.clear();

Answer 3

Dictionary<string, int> myDct = new Dictionary<string, int>();
myDct.Add("A", 1);
myDct.Add("B", 2);
myDct.Add("C", 3);
myDct.Add("D", 4);

List<string> list = new List<string>();
list.Add("B");
list.Add("C");

foreach (string s in list)
{
if (myDct.ContainsKey(s))
myDct[s] += 1;
}

foreach (string key in new string[] { "A", "B" })
{
if (myDct.ContainsKey(key)) myDct[key] += 1;
}

Answer 4

Dictionary<int, string> dic = new Dictionary<int, string>();
foreach (var kv in dic.Keys)
{
dic[kv] = "";
}
变向的方式

Answer 5

如果是winform ComboBox1.Items.Clear();

如果是web DropDownList1.Items.Clear();

最后设置一下 ComboBox1.Text ="";

DropDownList1.Text="";

追问

这样不是把结构也清理了？我指的是value。 我的事wpf