C# 程序检查列表是否为空
csharpprogrammingserver side programming更新于 2025/9/11 17:25:00
在 C# 中使用列表存储元素并获取元素。让我们看一个例子。
示例
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(string[] args) {
var subjects = new List<string>();
subjects.Add("Maths");
subjects.Add("Java");
subjects.Add("English");
subjects.Add("Science");
subjects.Add("Physics");
subjects.Add("Chemistry");
foreach (var sub in subjects) {
Console.WriteLine(sub);
}
}
}
输出
Maths Java English Science Physics Chemistry
现在要检查列表是否为空，请使用 Count 属性。
if (subjects.Count == 0)
Console.WriteLine("List is empty!");
现在让我们看看完整的代码。
示例
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(string[] args) {
var subjects = new List<string>();
subjects.Add("Maths");
subjects.Add("Java");
subjects.Add("English");
subjects.Add("Science");
subjects.Add("Physics");
subjects.Add("Chemistry");
if (subjects.Count == 0)
Console.WriteLine("List is empty!");
foreach (var sub in subjects) {
Console.WriteLine(sub);
}
}
}
输出
Maths Java English Science Physics Chemistry
