C# Char.IsHighSurrogate(String, Int32)用法及代码示例

此方法用于指示字符串中指定位置的Char对象是否为高替代对象。

用法:

public static bool IsHighSurrogate (string s, int index);

参数：

s：这是一个字符串。
index：它是s中的字符位置。

返回值：如果s参数中指定字符的数值范围为U+D800通过U+DBFF;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.IsHighSurrogate(String，Int32)方法的用法：

范例1：

// C# program to demonstrate the  
// Char.IsHighSurrogate(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 IsHighSurrogate() Method 
        bool val = Char.IsHighSurrogate(s, i); 
  
        // checking 
        if (val) 
  
            Console.WriteLine("String '{0}' contains High "
                  + "Surrogate value at index {1} ", s, i); 
        else
          Console.WriteLine("String '{0}' does't contain any High"
                          + "Surrogate value at index {1}", s, i); 
                                
    } 
}

输出：

String '1234' does't contain any HighSurrogate value at index 3
String 'Tsunami' does't contain any HighSurrogate value at index 3
String 'psyc0lo' does't contain any HighSurrogate value at index 4
String 'að??z' contains High Surrogate value at index 1

范例2：对于ArgumentNullException

// C# program to demonstrate the  
// Char.IsHighSurrogate(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); 
            Console.WriteLine(""); 
            Console.WriteLine("s is null"); 
            check(null, 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 IsHighSurrogate() Method 
        bool val = Char.IsHighSurrogate(s, i); 
  
        // checking 
        if (val) 
            Console.WriteLine("String '{0}' contains High "
                   + "Surrogate value at index {1} ",s, i); 
                                
        else
            Console.WriteLine("String '{0}' does't contain any High"
                             + "Surrogate value at index {1}",s, i); 
                                
    } 
}

输出：

String '1234' does't contain any HighSurrogate value at index 3
String 'Tsunami' does't contain any HighSurrogate value at index 3
String 'psyc0lo' does't contain any HighSurrogate value at index 4

s is null
Exception Thrown:System.ArgumentNullException

范例3：对于ArgumentOutOfRangeException

// C# program to demonstrate the  
// Char.IsHighSurrogate(String,  
// Int32) Method 
using System; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
        try { 
  
            // calling check() Method 
            check("1234", 3); 
            check("Tsunami", 3); 
  
            // 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("fjsjsj", -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 IsHighSurrogate() Method 
        bool val = Char.IsHighSurrogate(s, i); 
  
        // checking 
        if (val) 
            Console.WriteLine("String '{0}' contains High "
                  + "Surrogate value at index {1} ", s, i); 
                               
        else
            Console.WriteLine("String '{0}' does't contain any High"
                            + "Surrogate value at index {1}", s, i); 
                               
    } 
}

输出：

String '1234' does't contain any HighSurrogate value at index 3
String 'Tsunami' does't contain any HighSurrogate value at index 3
String 'að??z' contains High Surrogate value at index 1 

index is less than zero
Exception Thrown:System.ArgumentOutOfRangeException

参考：

https://docs.microsoft.com/en-us/dotnet/api/system.char.ishighsurrogate?view=netframework-4.7.2#System_Char_IsHighSurrogate_System_String_System_Int32_

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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.IsHighSurrogate(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。