Error cs0236 a field initializer cannot reference the non static field method or property - Исправление ошибок и поиск оптимальных решений проблем

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13 years, 8 months ago

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I don’t understand this error in C#

error CS0236: A field initializer cannot reference the non-static field, method, or property ‘Prv.DB.getUserName(long)’

For the following code

public class MyDictionary<K, V>
{
    public delegate V NonExistentKey(K k);
    NonExistentKey nonExistentKey;

    public MyDictionary(NonExistentKey nonExistentKey_) { }
}

class DB
{
    SQLiteConnection connection;
    SQLiteCommand command;

    MyDictionary<long, string> usernameDict = new MyDictionary<long, string>(getUserName);

    string getUserName(long userId) { }
}

asked May 28, 2009 at 21:39

Any object initializer used outside a constructor has to refer to static members, as the instance hasn’t been constructed until the constructor is run, and direct variable initialization conceptually happens before any constructor is run. getUserName is an instance method, but the containing instance isn’t available.

To fix it, try putting the usernameDict initializer inside a constructor.

answered May 28, 2009 at 21:42

thecoopthecoop

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answered May 28, 2009 at 22:40

ReneRene

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getUserName is an instance method.
Change it to static, that might work.

Initialize the dictionary in the constructor.

answered May 28, 2009 at 21:42

shahkalpeshshahkalpesh

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You cannot do this because the instance has to be initialized before you can access the properties of its class. The field initializers are called before the class is initialized.

If you want to initialize the field usernameDict with the return-value of the GetUserName-Method you have to do it within the constructor or make the Method a static one.

answered May 28, 2009 at 21:47

zoidbeckzoidbeck

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description	title	ms.date	f1_keywords	helpviewer_keywords
Compiler Error CS0236	Compiler Error CS0236	06/26/2021	CS0236	CS0236

Compiler Error CS0236

A field initializer cannot reference the non-static field, method, or property ‘name’.

Instance fields cannot be used to initialize other instance fields outside a method.

To correct this error

If you are trying to initialize a variable outside a method, consider performing the initialization inside the class constructor. For more information, see Methods.

Example

The following sample generates CS0236, and shows how to fix it:

public class MyClass
{
    public int i = 5;

    // To fix the error, remove "= i", and uncomment the line in constructor.
    public int j = i;  // CS0236

    public MyClass()
    {
        // Uncomment the following.
        //j = i;
    }
}

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C# Compiler Error

CS0236 – A field initializer cannot reference the non-static field, method, or property ‘name’

Reason for the Error

You will receive this error in your C# program when you are trying to initialize a member or variable using other instance fields outside of method.

For example, try to compile the below code snippet.

namespace DeveloperPubNamespace
{
    public class Employee
    {
        public string SurName = "";
        public string LastName = SurName;

    }
    class Program
    {
        public static void Main()
        {
        }
    }
}

This program will result with the C# error code CS0236 because the instance field LastName is initialized directly (outside of method) using another instance field SurName.

Error CS0236 A field initializer cannot reference the non-static field, method, or property ‘Employee.SurName’ DeveloperPublish C:UsersSenthilBalusourcereposConsoleApp3ConsoleApp3Program.cs 6 Active

Solution

To fix the error code CS0236 in C#, you should consider initializing the field either inside a method or using the class’s constructor.

namespace DeveloperPubNamespace
{
    public class Employee
    {
        public string SurName = "";
        public string LastName;
        public Employee()
        {
            LastName = SurName;
        }

    }
    class Program
    {
        public static void Main()
        {
        }
    }
}

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В чём проблема?
Вроде бы всё правильно,но оно мне пишет

Assets/Scripts/moving.cs(9,23): error CS0236: A field initializer cannot reference the nonstatic field, method, or property `moving.obj'

Assets/Scripts/moving.cs(8,23): error CS0236: A field initializer cannot reference the nonstatic field, method, or property `moving.obj'

ошибка,та же что там,что там.
Bот мой код:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class moving : MonoBehaviour {
	public GameObject obj;
	private float speed = 5f;
	private float xPos = obj.transform.position.x;
	private float yPos = obj.transform.position.y;

	private void Update () {
		if (Input.GetKey (KeyCode.D)) {
			xPos = xPos + speed * Time.deltaTime;
		} else if (Input.GetKey (KeyCode.W)) {
			yPos = yPos + speed * Time.deltaTime;
		} else if (Input.GetKey (KeyCode.A)) {
			xPos = xPos - speed * Time.deltaTime;
		} else if (Input.GetKey (KeyCode.S)) {
			yPos = yPos - speed * Time.deltaTime;
		}
		obj.transform.position = new Vector3 (xPos, yPos,0);
	}
}

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Remove From My Forums

Question

User-456111751 posted

Hi All,

Please review my code, i’ve removed the most part of the code which is not relevant to this:

namespace MyQuiz
{
    public partial class QuizPage : System.Web.UI.Page
    {

        protected int[] idquestion = new int[totalQuestions];
        

        public QuizPage()
        {
            Page.Init += new System.EventHandler(Page_Init);

        }
        
        
        

        
        private void ReadQuestionsIntoTable()
        {
            
            IEnumerable questions = SelectRows("Select * From Questions WHERE QuizID='48'");

            //Ashiq Code
            int a = 0;
            foreach (DataRowView question in questions)
            {
                a++;
            }
            totalQuestions = a;
            
            foreach (DataRowView question in questions)
            {
                
                idquestion = new int[totalQuestions];
                idquestion[NumberOfQuestions] = Convert.ToInt16(question["QuestionID"].ToString());
                
                }

                
            }
        

        

        protected void Page_Load(object sender, System.EventArgs e)
        {
            if (!IsPostBack)
            {

                ReadQuestionsIntoTable();



            }

            else
            {
                bool AreAllAnswered = CalculateScore(r);

            }
        }
    

       

        private bool CalculateScore(HttpRequest r)
        {
          
            for (int i = 0; i < r.Form.Keys.Count; i++)
            {
                                if (nextKey.Substring(0, 5) == "Group")
                {
                    foreach (int ie in idquestion)
                    {
                    }

                    
                }
            }

            return true;
        }
    }
}

What i would like to achieve from the above code is, I would like to read the value of the stored (In the method ReadQuestionsIntoTable) array
idquestion in private bool CalculateScore(HttpRequest r).

I’ve declared it by protected int[] idquestion = new int[totalQuestions]; initially so that i can use the array globally. I get the error message: CS0236: A field initializer cannot reference the nonstatic field, method, or property ‘MyQuiz.QuizPage.totalQuestions’

Please help guys, I am not sure whether i am Doing correct. I got stuck with this. My intent is to use the array
idquestion in method private bool CalculateScore(HttpRequest r) for a calculation.

Answers

User277293199 posted

as the Http is stateless so any variable declared globally will lose its value during postback, so in order to keep the values in the idquestion array you would store them in the ViewState or Session objects, so that you can retrieve them after postback

ex:

Public int[] IdQuestionsProperty

{

get{return ViewState[«idQuestion»];

set{ViewState[«idQuestion»]=value;}

}

please mark as an answer if it was helpful
- Marked as answer by
  
  Thursday, October 7, 2021 12:00 AM
User-456111751 posted

Hi Devan,

I changed as per yours still it dint work (Same error). I did store the values to session and retrived it later as adviced by Ahmed.

Referred the post http://forums.asp.net/t/1307299.aspx which helped a lot.

Thanks all for ur help.
- Marked as answer by
  Anonymous
  Thursday, October 7, 2021 12:00 AM

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