C# | Char。ConvertFromUtf32(Int32)方法

原文:https://www . geesforgeks . org/c-sharp-char-convertfromutf32 int 32-method/

此方法用于将指定的 Unicode 代码点转换为 UTF-16 编码的字符串。语法:

public static string ConvertFromUtf32 (int utf32);

这里， utf32 是 21 位 Unicode 码位。返回值:该方法返回一个字符串，该字符串由一个 Char 对象或一对替代 Char 对象组成，相当于 utf32 参数指定的代码点。异常:如果 utf32 不是从 U+0 到 U+10FFFF 的有效 21 位 Unicode 码点，则该方法返回argumentout of range Exception，不包括从 U+D800 到 U+DFFF 的代理项对范围。下面的程序说明了 Char 的使用。convertfrommutf32(Int32)方法: 例 1:

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate
// Char.ConvertFromUtf32(Int32)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // declaring and initializing
            // int variablewith 21 bit
            // unicode
            int utf = 0x0042;

            // getting the value
            // using ConvertFromUtf32()
            string value = Char.ConvertFromUtf32(utf);

            // Display the value
            Console.WriteLine("value is {0}", value);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

value is B

例 2: 为argumentout of range exception

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate
// Char.ConvertFromUtf32(Int32)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // declaring and initializing
            // int variable with 21 bit
            // unicode
            int utf = 0x11FFFF;

            // getting the value
            // using ConvertFromUtf32()
            Console.WriteLine("0x11FFFF is excedding the limit");
            string value = Char.ConvertFromUtf32(utf);

            // Display the value
            Console.WriteLine("value is {0}", value);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

0x11FFFF is excedding the limit
Exception Thrown: System.ArgumentOutOfRangeException

参考:

https://docs . Microsoft . com/en-us/dotnet/API/system . char . convertfromutf32？视图=netframework-4.7.2

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