C#| Copy（）方法-yiteyi-C++库

在C#中，Copy（）是一个字符串方法。它用于为指定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。要检查其引用，请使用赋值操作，该操作将现有字符串引用赋值给其他对象变量。

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语法：

public static string Copy(string str)

说明： 此方法接受单参数str，它是要复制的原始字符串。然后返回字符串值，即与str值相同的新字符串 系统一串 .

演示Copy（）方法的示例程序

                     // 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： https://msdn.microsoft.com/en-us/library/system.string.copy

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