C# | Char。IsLowSurrogate(字符串，Int32)方法
原文:https://www . geesforgeks . org/c-sharp-char-islowasuretestring-int 32-method/
此方法用于指示字符串中指定位置的 Char 对象是否为低代理。
语法:
public static bool IsLowSurrogate (string s, int index);
参数:
s :是一根弦。
索引:是 s 中要评价的人物位置。
返回值:如果 s 参数中指定字符的数值在U+DC00 到U+DFFF之间，则该方法返回真，否则返回假。
异常:
- 参数空异常:如果 s 为空。
- argumentout of range exception:如果指数不在的之内。
以下程序说明了字符的使用。IsLowSurrogate(字符串，Int32)方法:
例 1:
// C# program to demonstrate
// Char.IsLowSurrogate(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, 2);
}
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 IsLowSurrogate() Method
bool val = Char.IsLowSurrogate(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains Low "
+ "Surrogate value at index {1} ", s, i);
else
Console.WriteLine("String '{0}' does't contain any Low"
+ "Surrogate value at index {1}", s, i);
}
}
Output:
String '1234' does't contain any LowSurrogate value at index 3
String 'Tsunami' does't contain any LowSurrogate value at index 3
String 'psyc0lo' does't contain any LowSurrogate value at index 4
String 'að??z' contains Low Surrogate value at index 2
示例 2: 适用于参数异常
// C# program to demonstrate
// Char.IsLowSurrogate(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, 2);
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 IsLowSurrogate() Method
bool val = Char.IsLowSurrogate(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains Low "
+ "Surrogate value at index {1} ",s, i);
else
Console.WriteLine("String '{0}' does't contain any Low"
+ "Surrogate value at index {1}",s, i);
}
}
Output:
String '1234' does't contain any LowSurrogate value at index 3
String 'Tsunami' does't contain any LowSurrogate value at index 3
String 'psyc0lo' does't contain any LowSurrogate value at index 4
String 'að??z' contains Low Surrogate value at index 2
s is null
Exception Thrown: System.ArgumentNullException
例 3: 为argumentout of range exception
// C# program to demonstrate
// Char.IsLowSurrogate(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, 2);
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 IsLowSurrogate() Method
bool val = Char.IsLowSurrogate(s, i);
// checking
if (val)
Console.WriteLine("String '{0}' contains Low "
+ "Surrogate value at index {1} ",s, i);
else
Console.WriteLine("String '{0}' does't contain any Low"
+ "Surrogate value at index {1}",s, i);
}
}
Output:
String '1234' does't contain any LowSurrogate value at index 3
String 'Tsunami' does't contain any LowSurrogate value at index 3
String 'psyc0lo' does't contain any LowSurrogate value at index 4
String 'að??z' contains Low Surrogate value at index 2
index is less than zero
Exception Thrown: System.ArgumentOutOfRangeException
参考:
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