C# | Copy()方法
在 C# 中，Copy()是一个字符串方法。它用于为指定的字符串创建具有相同值的字符串的新实例。Copy()方法返回一个 String 对象，该对象与原始字符串相同，但表示不同的对象引用。若要检查其引用，请使用赋值操作，该操作将现有的字符串引用赋给附加的对象变量。
语法:
public static string Copy(string str)
说明:该方法接受单参数字符串，即需要复制的原始字符串。它返回字符串值，这是与字符串值相同的新字符串。复制()方法的类型是系统。弦。
示例程序说明复制()方法
// C# program to demonstrate the
// use of Copy() method
using System;
class Program {
static void cpymethod()
{
string str1 = "GeeksforGeeks";
string str2 = "GFG";
Console.WriteLine("Original Strings are str1 = "
+ "'{0}' and str2='{1}'", str1, str2);
Console.WriteLine("");
Console.WriteLine("After Copy method");
Console.WriteLine("");
// using the Copy method
// to copy the value of str1
// into str2
str2 = String.Copy(str1);
Console.WriteLine("Strings are str1 = "
+"'{0}' and str2='{1}'", str1, str2);
// check the objects reference equal or not
Console.WriteLine("ReferenceEquals: {0}",
Object.ReferenceEquals(str1, str2));
// check the objects are equal or not
Console.WriteLine("Equals: {0}", Object.Equals(str1, str2));
Console.WriteLine("");
Console.WriteLine("After Assignment");
Console.WriteLine("");
// to str1 object reference assign to str2
str2 = str1;
Console.WriteLine("Strings are str1 = '{0}' "
+"and str2 = '{1}'", str1, str2);
// check the objects reference equal or not
Console.WriteLine("ReferenceEquals: {0}",
Object.ReferenceEquals(str1, str2));
// check the objects are equal or not
Console.WriteLine("Equals: {0}", Object.Equals(str1, str2));
}
// Main Method
public static void Main()
{
// calling method
cpymethod();
}
}
输出:
Original Strings are str1 = 'GeeksforGeeks' and str2='GFG'
After Copy method
Strings are str1 = 'GeeksforGeeks' and str2='GeeksforGeeks'
ReferenceEquals: False
Equals: True
After Assignment
Strings are str1 = 'GeeksforGeeks' and str2 = 'GeeksforGeeks'
ReferenceEquals: True
Equals: True
参考:T2】https://msdn.microsoft.com/en-us/library/system.string.copy
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