StringBuilder.Chars [Int32]属性用于在此实例中在指定字符位置获取或设置字符。
Syntax: public char this[int index] { get; set; }
Here, the index is the position of the character.
Property Value: This property returns the Unicode character at position index.
例外情况：
- ArgumentOutOfRangeException：如果在设置字符时索引在此实例的范围之外。
- IndexOutOfRangeException：如果在获取字符时索引在此实例的范围之外。
下面的程序说明了上面讨论的属性的用法：
范例1：
// C# program demonstrate
// the Chars[Int32] Property
using System;
using System.Text;
class GFG {
// Main Method
public static void Main(String[] args)
{
// create a StringBuilder object
// with a String pass as parameter
StringBuilder str =
new StringBuilder("GeeksforGeeks");
// print string
Console.WriteLine("String is "
+ str.ToString());
// loop through string
// and print every Character
for (int i = 0; i < str.Length; i++) {
// get char at position i
char ch = str[i];
// print char
Console.WriteLine("Char at position "
+ i + " is " + ch);
}
}
}
输出：
String is GeeksforGeeks
Char at position 0 is G
Char at position 1 is e
Char at position 2 is e
Char at position 3 is k
Char at position 4 is s
Char at position 5 is f
Char at position 6 is o
Char at position 7 is r
Char at position 8 is G
Char at position 9 is e
Char at position 10 is e
Char at position 11 is k
Char at position 12 is s
范例2：
// C# program demonstrate
// the Chars[Int32] Property
using System;
using System.Text;
class GFG {
// Main Method
public static void Main(String[] args)
{
// create a StringBuilder object
StringBuilder str = new StringBuilder();
// add the String to StringBuilder Object
str.Append("Geek");
// get char at position 1
char ch = str[1];
// print the result
Console.WriteLine("StringBuilder Object"
+ " contains = " + str);
Console.WriteLine("Character at Position 1"
+ " in StringBuilder = " + ch);
}
}
输出：
StringBuilder Object contains = Geek
Character at Position 1 in StringBuilder = e
参考：
- https://docs.microsoft.com/zh-cn/dotnet/api/system.text.stringbuilder.chars?view=netframework-4.7.2