此方法用于指示字符串中指定位置的两个相邻Char对象是否形成代理对。
用法:
public static bool IsSurrogatePair (string s, int index);
参数：
- s：这是一个字符串。
- index：它是要在s内评估的一对字符的起始位置。
返回值：如果s参数在位置index和index + 1处包含相邻字符，并且位置index处的字符的数值范围为U+D800 通过U+DBFF，以及该位置的字符的数值 index +1范围从U+DC00通过U+DFFF否则返回假。
异常：
- ArgumentNullException：如果s为null。
- ArgumentOutOfRangeException：如果索引不在s内。
以下示例程序旨在说明Char.IsSurrogatePair(String，Int32)方法的用法：
范例1：
// C# program to demonstrate the
// Char.IsSurrogatePair(String,
// Int32) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling check() Method
check("1234", 3);
check("Tsunami", 3);
check("psyc0lo", 4);
// declaring and initializing string s1
string s1 = new String(new char[] {'a',
'\uD800', '\uDC00', 'z' });
check(s1, 1);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown:");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown:");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining check() method
public static void check(string s, int i)
{
// checking condition
// using IsSurrogatePair() Method
bool val = Char.IsSurrogatePair(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains "
+ "Surrogate pairs at s[{1}] and s[{2}]",
s, i, i + 1);
else
Console.WriteLine("String '{0}' does't contain any "
+ "Surrogate pairs at s[{1}] and s[{2}]",
s, i, i + 1);
}
}
输出：
String '1234' does't contain any Surrogate pairs at s[3] and s[4] String 'Tsunami' does't contain any Surrogate pairs at s[3] and s[4] String 'psyc0lo' does't contain any Surrogate pairs at s[4] and s[5] String 'að??z' contains Surrogate pairs at s[1] and s[2]
范例2：对于ArgumentNullException
// C# program to demonstrate the
// Char.IsSurrogatePair(String,
// Int32) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling check() Method
check("1234", 3);
check("Tsunami", 3);
check("psyc0lo", 4);
// declaring and initializing string s1
string s1 = new String(new char[] {'a',
'\uD800', '\uDC00', 'z' });
check(s1, 1);
Console.WriteLine("");
Console.WriteLine("s is null");
check(null, 4);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown:");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown:");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining check() method
public static void check(string s, int i)
{
// checking condition
// using IsSurrogatePair() Method
bool val = Char.IsSurrogatePair(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains "
+ "Surrogate pairs at s[{1}] and s[{2}]",
s, i, i + 1);
else
Console.WriteLine("String '{0}' does't contain any "
+ "Surrogate pairs at s[{1}] and s[{2}]",
s, i, i + 1);
}
}
输出：
String '1234' does't contain any Surrogate pairs at s[3] and s[4] String 'Tsunami' does't contain any Surrogate pairs at s[3] and s[4] String 'psyc0lo' does't contain any Surrogate pairs at s[4] and s[5] String 'að??z' contains Surrogate pairs at s[1] and s[2] s is null Exception Thrown:System.ArgumentNullException
范例3：对于ArgumentOutOfRangeException
// C# program to demonstrate the
// Char.IsSurrogatePair(String,
// Int32) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling check() Method
check("1234", 3);
check("Tsunami", 3);
check("psyc0lo", 4);
// declaring and initializing string s1
string s1 = new String(new char[] {'a',
'\uD800', '\uDC00', 'z' });
check(s1, 1);
Console.WriteLine("");
Console.WriteLine("index is less than zero");
check("null", -4);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown:");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown:");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining check() method
public static void check(string s, int i)
{
// checking condition
// using IsSurrogatePair() Method
bool val = Char.IsSurrogatePair(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains "
+ "Surrogate pairs at s[{1}] and s[{2}]",
s, i, i + 1);
else
Console.WriteLine("String '{0}' does not contain any "
+ "Surrogate pairs at s[{1}] and s[{2}]",
s, i, i + 1);
}
}
输出：
String '1234' does not contain any Surrogate pairs at s[3] and s[4] String 'Tsunami' does not contain any Surrogate pairs at s[3] and s[4] String 'psyc0lo' does not contain any Surrogate pairs at s[4] and s[5] String 'að??z' contains Surrogate pairs at s[1] and s[2] index is less than zero Exception Thrown:System.ArgumentOutOfRangeException
参考：
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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 C# | Char.IsSurrogatePair(String, Int32) Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。