C# |字典。密钥属性
原文:https://www . geesforgeks . org/c-sharp-dictionary-keys-property/
此属性用于获取包含字典中的键的集合。
语法:
公共系统。集合。类属。词典。KeyCollection Keys { get}
返回值:返回包含字典中关键字的集合。
以下是说明上述属性使用的程序:
例 1:
// C# code to get the keys
// in the Dictionary
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new dictionary of
// strings, with string keys.
Dictionary<string, string> myDict =
new Dictionary<string, string>();
// Adding key/value pairs in myDict
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// To get count of key/value pairs in myDict
Console.WriteLine("Total key/value pairs"+
" in myDict are : " + myDict.Count);
// To get the keys alone,
// use the Keys property.
Dictionary<string, string>.KeyCollection keyColl =
myDict.Keys;
// The elements of the KeyCollection
// are strongly typed with the type
// that was specified for dictionary
// keys
foreach(string s in keyColl)
{
Console.WriteLine("Key = {0}", s);
}
}
}
Output:
Total key/value pairs in myDict are : 6
Key = Australia
Key = Belgium
Key = Netherlands
Key = China
Key = Russia
Key = India
例 2:
// C# code to get the keys in the Dictionary
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new dictionary of
// strings, with string keys.
Dictionary<int, int> myDict =
new Dictionary<int, int>();
// Adding key/value pairs in myDict
myDict.Add(9, 8);
myDict.Add(3, 4);
myDict.Add(4, 7);
myDict.Add(1, 7);
// To get count of key/value pairs in myDict
Console.WriteLine("Total key/value pairs "+
"in myDict are : " + myDict.Count);
// To get the keys alone,
// use the Keys property.
Dictionary<int, int>.KeyCollection keyColl =
myDict.Keys;
// The elements of the KeyCollection
// are strongly typed with the type
// that was specified for dictionary keys.
foreach(int s in keyColl)
{
Console.WriteLine("Key = {0}", s);
}
}
}
Output:
Total key/value pairs in myDict are : 4
Key = 9
Key = 3
Key = 4
Key = 1
参考:
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