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C# Error CS0188 – The ‘this’ object cannot be used before all of its fields are assigned to

C# Compiler Error

CS0188 – The ‘this’ object cannot be used before all of its fields are assigned to

Reason for the Error

You will receive this error when you are using struct in your C# code and have not initialized the backing fields in the constructor. You might be initializing the property which would be causing this error. All the fields in a struct should be assigned by the constructor.

For example, try to compile the below code snippet.

using System;

namespace DeveloperPubNamespace
{
    public struct Employee
    {
        private int _id ;
        private string _name;
        public int Id
        {
            get { return this._id; }
            set { this._id = value; }
        }

        public Employee(int Id, string Name)
        {
            this.Id = Id; 
        }
    }
    class Program
    {
           
        
        static void Main(string[] args)
        {

        }
       
    }
  
}

Error CS0188 The ‘this’ object cannot be used before all of its fields have been assigned ConsoleApp3 C:\Users\SenthilBalu\source\repos\ConsoleApp3\ConsoleApp3\Program.cs 18 Active

C# Error CS0188 - The 'this' object cannot be used before all of its fields are assigned to

Solution

To fix the error, you will need to initialize all the backing fields of the property instead of initializing the property itself as shown below.

using System;

namespace DeveloperPubNamespace
{
    public struct Employee
    {
        private int _id ;
        private string _name;
        public int Id
        {
            get { return this._id; }
            set { this._id = value; }
        }

        public Employee(int Id, string Name)
        {
            _id = Id;
            _name = Name;
        }
    }
    class Program
    {
           
        
        static void Main(string[] args)
        {

        }
       
    }
  
}