Overview:The above content introduces in detail the implementation of multi-layer nested copying methods in C# that do not change the original List value, including steps and examples for using AutoMapper, and object serialization. These methods provide a flexible and efficient way to choose the most suitable deep replication method according to project requirements.
1. Multi-layer nested copy using AutoMapper
AutoMapper is an object mapping tool that allows easy mapping between objects. Here are the steps and examples for implementing multi-layer nested replication using AutoMapper:
First, you need to install the AutoMapper package in your project. You can install it by running the following command through the NuGet Package Manager console:
Install-Package AutoMapper
Then you can use the following code for deep copying:
using AutoMapper;
using System;
using ;
class Person
{
public string Name { get; set; }
public int Age { get; set; }
}
class Student
{
public string StudentId { get; set; }
public Person Info { get; set; }
}
class Program
{
static void Main()
{
// Create original list, multi-layer nesting List<Student> originalList = new List<Student>
{
new Student { StudentId = "001", Info = new Person { Name = "Alice", Age = 25 } },
new Student { StudentId = "002", Info = new Person { Name = "Bob", Age = 30 } }
};
// Use AutoMapper to achieve deep replication List<Student> copiedList = DeepCopyWithAutoMapper(originalList);
// Modify the copied value copiedList[0]. = "Charlie";
// Print the original value and verify whether the value of the original List has changed ("The value of the original List:");
PrintList(originalList);
// Print the copied value ("\nThe value of List after copying:");
PrintList(copiedList);
}
static List<Student> DeepCopyWithAutoMapper(List<Student> originalList)
{
// Initialize AutoMapper configuration var config = new MapperConfiguration(cfg =>
{
// Map configuration for each layer of nested types <Student, Student>();
<Person, Person>();
});
// Create a mapper IMapper mapper = ();
// Use mapper for deep copy List<Student> newList = <List<Student>>(originalList);
return newList;
}
// How to print List static void PrintList(List<Student> list)
{
foreach (var student in list)
{
($"StudentId: {}, Name: {}, Age: {}");
}
}
}In this example, the AutoMapper configuration is first initialized, and then the mapper is created, and deep replication is used.
2. Use multi-layer nested copy
() is a powerful library for processing JSON data, and can also be used to implement deep replication. Here are the steps and examples for implementing multi-layer nested replication using:
First, you need to install the package in the project. You can install it by running the following command through the NuGet Package Manager console:
Install-Package
Then you can use the following code for deep copying:
using ;
using System;
using ;
class Person
{
public string Name { get; set; }
public int Age { get; set; }
}
class Student
{
public string StudentId { get; set; }
public Person Info { get; set; }
}
class Program
{
static void Main()
{
// Create original list, multi-layer nesting List<Student> originalList = new List<Student>
{
new Student { StudentId = "001", Info = new Person { Name = "Alice", Age = 25 } },
new Student { StudentId = "002", Info = new Person { Name = "Bob", Age = 30 } }
};
// Use to achieve deep replication List<Student> copiedList = DeepCopyWithJson(originalList);
// Modify the copied value copiedList[0]. = "Charlie";
// Print the original value and verify whether the value of the original List has changed ("The value of the original List:");
PrintList(originalList);
// Print the copied value ("\nThe value of List after copying:");
PrintList(copiedList);
}
static List<Student> DeepCopyWithJson(List<Student> originalList)
{
// Use JsonConvert for deep copying string json = (originalList);
List<Student> newList = <List<Student>>(json);
return newList;
}
// How to print List static void PrintList(List<Student> list)
{
foreach
(var student in list)
{
($"StudentId: {}, Name: {}, Age: {}");
}
}
}In this example, using JsonConvert to convert the original List to a JSON string, and then deserialize it from the JSON string to obtain a new List, realizing deep copying.
3. Deep copying using object serialization and deserialization
Another common method is to use C#'s object serialization and deserialization functions to serialize objects into byte streams, and then deserialize them into new objects. Here are the steps and examples for implementing multi-layer nested replication using serialization and deserialization:
using System;
using ;
using ;
using ;
using ;
class Person
{
public string Name { get; set; }
public int Age { get; set; }
}
class Student
{
public string StudentId { get; set; }
public Person Info { get; set; }
}
class Program
{
static void Main()
{
// Create original list, multi-layer nesting List<Student> originalList = new List<Student>
{
new Student { StudentId = "001", Info = new Person { Name = "Alice", Age = 25 } },
new Student { StudentId = "002", Info = new Person { Name = "Bob", Age = 30 } }
};
// Use serialization and deserialization to achieve deep replication List<Student> copiedList = DeepCopyWithSerialization(originalList);
// Modify the copied value copiedList[0]. = "Charlie";
// Print the original value and verify whether the value of the original List has changed ("The value of the original List:");
PrintList(originalList);
// Print the copied value ("\nThe value of List after copying:");
PrintList(copiedList);
}
static List<Student> DeepCopyWithSerialization(List<Student> originalList)
{
IFormatter formatter = new BinaryFormatter();
using (MemoryStream stream = new MemoryStream())
{
(stream, originalList);
(0, );
return (List<Student>)(stream);
}
}
// How to print List static void PrintList(List<Student> list)
{
foreach (var student in list)
{
($"StudentId: {}, Name: {}, Age: {}");
}
}
}In this example, using BinaryFormatter to serialize the original List into a byte stream, and then deserialize to obtain a new List, realizing deep copying.
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