C#程序在字典中查找键
首先，设置带有元素的Dictionary集合。
Dictionary<int, string> d = new Dictionary<int, string>() {
{1,"Applianes"},
{2, "Clothing"},
{3,"Toys"},
{4,"Footwear"},
{5, "Accessories"}
};现在，假设您需要检查密钥5是否存在。为此，使用ContainsKey()方法。如果找到密钥，则返回True。
d.ContainsKey(5);
让我们看完整的代码。
示例
using System;
using System.Collections.Generic;
public class Program {
public static void Main() {
Dictionary<int, string> d = new Dictionary<int, string>() {
{1,"Electronics"},
{2, "Clothing"},
{3,"Toys"},
{4,"Footwear"},
{5, "Accessories"}
};
foreach (KeyValuePair<int, string> ele in d) {
Console.WriteLine("Key = {0}, Value = {1}", ele.Key, ele.Value);
}
Console.WriteLine("Key 5 exists? "+d.ContainsKey(5));
}
}输出结果
Key = 1, Value = Electronics Key = 2, Value = Clothing Key = 3, Value = Toys Key = 4, Value = Footwear Key = 5, Value = Accessories Key 5 exists? True
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