字符串入门

代码示例

1string someText = "Hello World!";

1// 使用字符串字面量
2string someText = "Hello World!";
3Console.WriteLine(someText);
4
5// 通过类的构造函数之一
6string someOtherText = new string(['h', 'u', 'n', 't']);
7Console.WriteLine(someOtherText);

代码示例

1string? someString = null;

1string? nullString = null;
2string emptyString = "";
3string spaceString = "   ";
4
5// 返回 true，因为字符串为 null
6Console.WriteLine(string.IsNullOrEmpty(nullString)); 
7
8// 返回 true，因为字符串只包含空格
9Console.WriteLine(string.IsNullOrWhiteSpace(spaceString));

1string folderPath = @"C:\Users\Admin\Documents";
2
3string jsonPayload = """
4{
5    "user": "Alice",
6    "status": "Active"
7}
8""";
9
10Console.WriteLine(folderPath);
11Console.WriteLine(jsonPayload);

1string text = "Hello World!";
2Console.WriteLine(text[0]); // 输出将为 H
3Console.WriteLine(text.Length); // 12