此方法用于将指定字符串的值转换为其等效的Unicode字符。
句法：
public static char Parse (string s);此处， s是包含单个字符或null的字符串。
返回值：该方法返回一个Unicode字符等效于s中的唯一字符。
例外情况：
ArgumentNullException: If s is null.
FormatException: If the length of s is not 1.
下面的程序说明了Char.Parse(String)方法的用法：
范例1：
// C# program to demonstrate the
// Char.Parse(String) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling Parse() Method
get("1");
get("a");
get("@");
get("-");
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s)
{
// getting Unicode character
// using Parse() Method
char val = Char.Parse(s);
// display the char value
Console.WriteLine("Unicode character "+
"of string {0} is {1}", s, val);
}
}
输出：
Unicode character of string 1 is 1
Unicode character of string a is a
Unicode character of string @ is @
Unicode character of string - is -
示例2：对于ArgumentNullException
// C# program to demonstrate the
// Char.Parse(String) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling Parse() Method
get("1");
get("a");
get("@");
get("-");
Console.WriteLine("");
Console.WriteLine("s is null");
get(null);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s)
{
// getting Unicode character
// using Parse() Method
char val = Char.Parse(s);
// display the char value
Console.WriteLine("Unicode character of"+
" string {0} is {1}", s, val);
}
}
输出：
Unicode character of string 1 is 1
Unicode character of string a is a
Unicode character of string @ is @
Unicode character of string - is -
s is null
Exception Thrown: System.ArgumentNullException
示例3：对于FormatException
// C# program to demonstrate the
// Char.Parse(String) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// calling Parse() Method
get("1");
get("a");
get("@");
get("-");
Console.WriteLine("");
Console.WriteLine("The length of s is not 1.");
get("null");
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s)
{
// getting Unicode character
// using Parse() Method
char val = Char.Parse(s);
// display the char value
Console.WriteLine("Unicode character of "+
"string {0} is {1}", s, val);
}
}
输出：
Unicode character of string 1 is 1
Unicode character of string a is a
Unicode character of string @ is @
Unicode character of string - is -
The length of s is not 1.
Exception Thrown: System.FormatException
参考：
- https://docs.microsoft.com/zh-cn/dotnet/api/system.char.parse?view=netframework-4.7.2