在c#中简单编辑字符串

string str1 = "Hello";
string str2 = "World";
string result = str1 + " " + str2; // 结果为 "Hello World"

string str = "Hello World";
string newStr = str.Replace("World", "Universe"); // 结果为 "Hello Universe"

string str = "apple,banana,orange";
string[] fruits = str.Split(','); // 结果为 ["apple", "banana", "orange"]

string str = "Hello World";
string upperCase = str.ToUpper(); // 结果为 "HELLO WORLD"
string lowerCase = str.ToLower(); // 结果为 "hello world"

string name = "Alice";
int age = 25;
string message = $"My name is {name} and I'm {age} years old."; // 结果为 "My name is Alice and I'm 25 years old."