Private Readonly C

Private Readonly C
Nov 1, 2025
This is designed for primitives. Class members that are objects can have const functions to make them 'read only'. To make them accessible by the containing class (as the question pertains) make that class a friend class and make the non-const functions private.
In what situation should I use a Private Set on a property versus making it a ReadOnly property? Take into consideration the two very simplistic examples below. First example: Public Class Perso...
Feb 16, 2025
Understanding readonly in C Introduction In the world of C# programming, the readonly keyword plays a crucial role in controlling the mutability of fields. It provides a way to ensure that certain data members of a class or struct cannot be modified after a specific point in time, typically during object initialization. This not only helps in writing more robust and predictable code but also ...
Oct 12, 2025
You can use readonly, get-only auto properties, and init-only setters, but you never have to. Of course, all three of these language features will make your code more readable in its intent, slightly more performant, and can protect against undesired behavior for values you don't want to change after creation.
In this article, we are going to learn about readonly modifier in C#. Let's understand what is mutable and immutable.
readonly and public/private At work, one of my co workers initialized a field like this: private readonly SomeType _field; Since readonly is a modifier to only allow allocation of _field to a value, at the constructor of the class or at the initialization of the field, why do we then need the "private" or a "public" modifier?
You should distinguish the difference between private/protected/public and readonly. private and protected fields can be changed but only within the class. You need to write methods to print their value. The difference between private and protected is that, if a field is private the derived classes won't know about this field.
Mar 30, 2024
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Is there a difference between having a private const variable or a private static readonly variable in C# (other than having to assign the const a compile-time expression)? Since they are both pri...
If it's private and readonly, the benefit is that you can't inadvertently change it from another part of that class after it is initialized. The readonly modifier ensures the field can only be given a value during its initialization or in its class constructor.
Is this better or worse than private readonly List layouts2 = new List(); (N.B. this is related to the 2011 question .NET Properties - Use Private Set or ReadOnly Property?, but that includes a public getter alongside a private setter. Here I only have a private getter.)
What is the difference between const and readonly in C#? When would you use one over the other?
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Private Readonly Field and Constructor I couldnt quite grasp the readonly and the CategoryController constructor here, what is the necessity of private readonly constructor and assigning _db = db.
So, if the value represents something that semantically cannot be changed after the object's construction, you should not declare a private setter (this would imply that the object might change it). Go for the readonly field (and maybe declare it private and declare a public property with only a getter accessing the field!
⚠️ Warning An externally visible type that contains an externally visible read-only field that is a mutable reference type may be a security vulnerability and may trigger warning CA2104 : "Do not declare read only mutable reference types." 2️⃣ In a readonly struct type definition, readonly indicates that the structure type is immutable.
I need to implement a read only property on my type. Moreover the value of this property is going to be set in the constructor and it is not going to be changed (I am writing a class that exposes c...
A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used. Also, while a const field is a compile-time constant, the readonly field can be used for runtime constants From this short and clear MSDN reference.
It pays to bare in mind that if you assign readonly to something like a class such as private readonly TaskCompletionSource _ready = new TaskCompletionSource(); then you can still use _ready.SetResult(true) so the readonly applies only to the field and not necessarily the object's properties or state.
Understand about Const, readonly and static readonly and review the differences. Tagged with csharp, dotnet, programming, discuss.
You can change a private read-only field in C# using inheritance. Create a child, and in it's constractor write: base.PrivateField = something or even base.AnotherPrivatePropertyWhereFirstPrivatePropertyTakesItsValue.
I have three objects : private static readonly Apple a, c; private readonly Orange b; This code is called from my constructor : public SomeClass() { a = new Apple(); b = new Orange(a.getD...
I'm coming to C++ from C# and const-correctness is still new to me. In C# I could declare a property like this: class Type { public readonly int x; public Type(int y) { x = y...
I have an abstract class and I'd like to initialize a readonly field in its protected constructor. I'd like this readonly field to be available in derived classes. Following my habit of making all
The only way to enforce read-only variables is to manage the client code — either by sandboxing it in a VM or by algorithmically verifying that it can't modify your variable.
Applying the readonly modifier on a field prevents you (or someone else) to change its value after the object is constructed. It can only be assigned in the constructor.
readonly キーワード - C# リファレンス readonly struct 型定義では、 readonly は構造体の型が不変であることを示します。 詳細については、 readonly に関する記事の 「構造体」セクションを参照してください。 構造体型内のインスタンス メンバー宣言では、 readonly は、インスタンス メンバーが構造体 ...
This change allows you to keep the internal structure of the class intact and prevent any modifications. All in all, if you want to create read only properties, just omit the definition of the setter in that specific property while making sure the field stays private so you do not violate the principle of encapsulation.
Private readonly is only settable from the constructor. { get; } is the same as public get private set; meaning it cannot be set from outside the class but can be set inside the class.
Jul 18, 2024
I got three class files where in constant is declared as private const string PAGE_SIZE = "PageSize"; Is it good to move this to new file to hold all common constants declared as public readonly
Learn the differences between const and readonly in C# code and understand when to use them in your project with code examples.
This article will teach C# readonly and C# const variables with code examples.
Locking down state is great. In C# you can ensure that a field doesn't change it's value/reference once the constructor completes by declaring it as readonly. class Foo { private readonly str...
You could encapsulate the read-only functionality in a separate class and overload the assignment operator of that class to do nothing. Then you can use that class to build classes with read-only variables without having to overload the assignment operator again (the default assignment operator will call the overloaded assignment operator of ...
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May 21, 2024
Setting the private field of your class as readonly allows you to set the field value only in the constructor of the class (using an inline assignment or a defined constructor method).
Oct 7, 2024
Just imagine having tons of read-only variables like foo. Also even when using __forceinline, which should already be one level above inline (being just some kind of a recommendation to the compiler), I am still not 100% convinced that c.GetFoo () can be as fast as foo.
I have some class with List-property: class Foo { private List myList; } I want provide access to this field only for read. I.e. I want property with access to Enumerable, Count, etc...
How can I expose a List so that it is readonly, but can be set privately? This doesn't work: public List myList {readonly get; private set; } Even if you do: public List<
Note: This is similar in functionality to the primary constructors that were considered for C# 6 but were dropped "because we're going to have record types!". I'm reanimating this similar proposal ...
A read only member is like a constant in that it represents an unchanging value. The difference is that a readonly member can be initialized at runtime, in a constructor as well being able to be initialized as they are declared.
6 True read-only memory is implemented by the memory subsystem of the OS. The OS can mark certain pages as read-only. In the binary, the compiler can tell the OS which parts of the executable should be placed in read-only vs read-write memory pages.
readonly 关键字 - C# 参考 readonly struct 在类型定义中， readonly 指示结构类型不可变。 有关详细信息，请参阅 readonly 结构类型 文章的结构部分。 在结构类型中的实例成员声明中， readonly 指示实例成员不会修改结构的状态。 有关详细信息，请参阅 readonly 结构类型 文章的实例成员部分。 ref readonly 在 ...
Example using Const variable. The read-Only variable in C#. Example using the read-only variable. Difference between Const, Readonly, Static and Non-Static Variable in C#. According to MSDN The Constants variables are the immutable values that are known at the time of program compilation and do not change their values for the lifetime of the ...
Inpired by this answer I'm using the following solution for read-only member variables: template class readonly { friend OWNER; public: explicit readonly (cons...
C#における定数値の扱い方 C#では変わらない値を定義する際に「const」「readonly」を使用すると思います。 何も知らずに使用しているとコードレビューなどで指摘されてしまうこともあるので、整理しておこうと思います。 const 以下、Microsoftのリファ...
Sep 26, 2024
In C#, you can use a readonly keyword to declare a readonly variable. This readonly keyword shows that you can assign the variable only when you declare a variable or in a constructor of the same class in which it is declared.
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