C# |获取包含有序字典中的键的集合
原文:https://www . geesforgeks . org/c-sharp-get-an-I collection-containing-key-in-ordered dictionary/
OrderedDictionary。Keys 属性用于获取一个集合对象，该对象包含 OrderedDictionary 集合中的键。
语法:
public System.Collections.ICollection Keys { get; }
返回值:它返回一个包含 OrderedDictionary 集合中的键的集合对象。
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to get an ICollection
// containing the keys in OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add("key1", "value1");
myDict.Add("key2", "value2");
myDict.Add("key3", "value3");
myDict.Add("key4", "value4");
myDict.Add("key5", "value5");
// Getting an ICollection containing
// the keys in OrderedDictionary
ICollection keyCollection = myDict.Keys;
// Creating a String array
String[] myKeys = new String[myDict.Count];
// Copying the OrderedDictionary elements to
// a one-dimensional Array object at the
// specified index.
keyCollection.CopyTo(myKeys, 0);
for (int i = 0; i < myDict.Count; i++) {
Console.WriteLine(myKeys[i]);
}
}
}
输出:
key1
key2
key3
key4
key5
例 2:
// C# code to get an ICollection
// containing the keys in OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add("A", "Apple");
myDict.Add("B", "Banana");
myDict.Add("C", "Cat");
myDict.Add("D", "Dog");
// Getting an ICollection containing
// the keys in OrderedDictionary
ICollection keyCollection = myDict.Keys;
// Creating a String array
String[] myKeys = new String[myDict.Count];
// Copying the OrderedDictionary elements to
// a one-dimensional Array object at the
// specified index.
keyCollection.CopyTo(myKeys, 0);
for (int i = 0; i < myDict.Count; i++) {
Console.WriteLine(myKeys[i]);
}
}
}
输出:
A
B
C
D
参考:
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