


Detailed explanation of the differences between ==, Equals, and ReferenceEquals in C#
Introduction to this article:
Equals, ==, in C# ReferenceEquals can be used to determine whether the individuals of two objects are equal. For the same basic value type, the comparison results of == and Equals() are the same; since ReferenceEquals() determines whether the references of two objects are equal, for values Type, because a boxing operation must be performed before each judgment, that is, a temporary object is generated every time, so false will always be returned.
1. == operator
1. Static equality symbol, corresponding to the existing !=. This symbol is an overloadable binary operator that can be used to compare whether two objects are equal.
2. It will automatically perform necessary type conversion as needed, and return true or false depending on whether the values of the two objects are equal.
3. For reference objects, compare their references (except for string reference types, string is a comparison value)
4. For value types, compare their values
5. Some built-in reference types overload the == symbol, such as string Just overload == so that it compares not the references of the two strings, but whether the two string literals are equal.
6. For example:
int i = 5; int j = 5; Console.WriteLine(i == j);//值类型比较代数值 输出True int m = 6; double n = 6.0; Console.WriteLine(m == n);//类型自动转换并比较数值 输出True object obj1 = new object(); object obj2 = new object(); Console.WriteLine(obj2==obj1);//引用类型比较引用 输出False
2. Equals
1. Used to compare whether the references of two objects are equal.
2. However, for value types, if the type is the same (no automatic type conversion will be performed), and the value is the same (each member of the struct must be the same), then Equals returns
true, otherwise return false.
3. For reference types, the default behavior is the same as that of ReferenceEquals. True is returned only when two objects point to the same Reference.
4. Equals can be overloaded as needed
5. Instance
int i = 5; int j = 5; Console.WriteLine(i.Equals(j));//值类型比较 输出True int m = 6; double n = 6.0; Console.WriteLine(m.Equals(n));//类型不会自动转换并比较数值 输出False object obj1 = new object(); object obj2 = new object(); Console.WriteLine(obj2.Equals(obj1));//引用类型比较 输出False Console.WriteLine(obj2.Equals(string.Empty));//输出False,比较量对象的类型不同直接返回False
3. ReferenceEquals
1. Static method of Object, compares whether the references of two objects are equal, value type and reference type It's all the same.
2. This method cannot be overridden in inherited classes. The prototype is: public static bool ReferenceEquals(object objA, object
objB);FCL has been implemented for us. It is to compare whether the memory address pointed to by the reference is the same.
3. For two value types, ReferenceEquals is always false because ReferenceEquals(object a,object
b) After the method, the value type is reboxed into a new reference type instance, and naturally there is no reference equality.
4. For two reference types, ReferenceEquals will compare whether they point to the same address.
5. Examples
int i = 5; int j = 5; Console.WriteLine(object.ReferenceEquals(i, j));//输出False int m = 6; double n = 6.0; Console.WriteLine(object.ReferenceEquals(m, n));//输出False object obj1 = new object(); object obj2 = new object(); Console.WriteLine(object.ReferenceEquals(obj1, obj2));//输出False
The above are the differences between ==, Equals, and ReferenceEquals. I hope it will be helpful to everyone's learning. For more related articles, please pay attention to the PHP Chinese website (www.php.cn) !

The combination of C# and .NET provides developers with a powerful programming environment. 1) C# supports polymorphism and asynchronous programming, 2) .NET provides cross-platform capabilities and concurrent processing mechanisms, which makes them widely used in desktop, web and mobile application development.

.NETFramework is a software framework, and C# is a programming language. 1..NETFramework provides libraries and services, supporting desktop, web and mobile application development. 2.C# is designed for .NETFramework and supports modern programming functions. 3..NETFramework manages code execution through CLR, and the C# code is compiled into IL and runs by CLR. 4. Use .NETFramework to quickly develop applications, and C# provides advanced functions such as LINQ. 5. Common errors include type conversion and asynchronous programming deadlocks. VisualStudio tools are required for debugging.

C# is a modern, object-oriented programming language developed by Microsoft, and .NET is a development framework provided by Microsoft. C# combines the performance of C and the simplicity of Java, and is suitable for building various applications. The .NET framework supports multiple languages, provides garbage collection mechanisms, and simplifies memory management.

C# and .NET runtime work closely together to empower developers to efficient, powerful and cross-platform development capabilities. 1) C# is a type-safe and object-oriented programming language designed to integrate seamlessly with the .NET framework. 2) The .NET runtime manages the execution of C# code, provides garbage collection, type safety and other services, and ensures efficient and cross-platform operation.

To start C#.NET development, you need to: 1. Understand the basic knowledge of C# and the core concepts of the .NET framework; 2. Master the basic concepts of variables, data types, control structures, functions and classes; 3. Learn advanced features of C#, such as LINQ and asynchronous programming; 4. Be familiar with debugging techniques and performance optimization methods for common errors. With these steps, you can gradually penetrate the world of C#.NET and write efficient applications.

The relationship between C# and .NET is inseparable, but they are not the same thing. C# is a programming language, while .NET is a development platform. C# is used to write code, compile into .NET's intermediate language (IL), and executed by the .NET runtime (CLR).

C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.


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