C# | Convert。托卡尔(字符串，表单提供者)方法
原文:https://www . geesforgeks . org/c-sharp-convert-tocharstring-iformat provider-method/
此方法用于使用指定的区域性特定格式信息，将指定对象的值转换为其等效的 Unicode 字符。
语法:
public static char ToChar (object value, IFormatProvider provider);
参数:
- 值:是长度 1 或空的整数串。
- 提供程序:它是一个提供区域性特定格式信息的对象。
返回值:该方法返回一个 Unicode 字符，该字符相当于值中的第一个也是唯一一个字符。
异常:
- ArgumentNullException :如果值为空。
- 格式异常:如果值的长度不是 1。
以下程序说明了转换的使用。方法:
例 1:
// C# program to demonstrate the
// Convert.ToChar() Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of CultureInfo
CultureInfo cultures = new CultureInfo("en-US");
// declaring and initializing
// String array
string[] values = {"A", "B", "a",
"b", "x", "z"};
// calling get() Method
Console.WriteLine("Converted char value "+
"of specified strings: ");
for (int j = 0; j < values.Length; j++) {
get(values[j], cultures);
}
}
catch (FormatException e) {
Console.WriteLine("\n");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (OverflowException e) {
Console.WriteLine("\n");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s,
CultureInfo cultures)
{
// converting string to specified char
char val = Convert.ToChar(s, cultures);
// display the converted char value
Console.Write(" {0}, ", val);
}
}
Output:
Converted char value of specified strings:
A, B, a, b, x, z,
示例 2: 适用于参数异常
// C# program to demonstrate the
// Convert.ToChar() Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of CultureInfo
CultureInfo cultures = new CultureInfo("en-US");
// declaring and initializing String array
string[] values = {"A", "B", "a",
"b", "x", "z"};
// calling get() Method
Console.WriteLine("Converted char value "+
"of specified strings: ");
for (int j = 0; j < values.Length; j++) {
get(values[j], cultures);
}
Console.WriteLine("\n");
string s = null;
Console.WriteLine("s is null ");
// converting string to specified char
char val = Convert.ToChar(s, cultures);
// display the converted char value
Console.Write(" {0}, ", val);
}
catch (FormatException e) {
Console.WriteLine("\n");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s, CultureInfo cultures)
{
// converting string to specified char
char val = Convert.ToChar(s, cultures);
// display the converted char value
Console.Write(" {0}, ", val);
}
}
Output:
Converted char value of specified strings:
A, B, a, b, x, z,
s is null
Exception Thrown: System.ArgumentNullException
例 3: 为格式异常
// C# program to demonstrate the
// Convert.ToChar() Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of CultureInfo
CultureInfo cultures = new CultureInfo("en-US");
// declaring and initializing String array
string value1 = "x";
string value2 = "xyz";
get(value1, cultures);
Console.WriteLine("\nlength of value2 is not 1");
get(value2, cultures);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s,
CultureInfo cultures)
{
// converting string to specified char
char val = Convert.ToChar(s, cultures);
// display the converted char value
Console.WriteLine("string to char value : {0} ", val);
}
}
Output:
string to char value : x
length of value2 is not 1
Exception Thrown: System.FormatException
参考:
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