C# 字段';xxx和x27;从未分配给,并且其默认值始终为空

C# 字段';xxx和x27;从未分配给,并且其默认值始终为空,c#,C#,我的错误: 字段“StockManagement.LargeItems1.largeS”从未分配给,并且其默认值始终为null 我的代码: namespace StockManagement { class LargeItems1 { private Stack<string> largeS; public LargeItems1() { Stack<string> largeS

我的错误:
字段“StockManagement.LargeItems1.largeS”从未分配给,并且其默认值始终为null
我的代码:

namespace StockManagement
{
    class LargeItems1
    {
        private Stack<string> largeS;

         public LargeItems1()
        {
            Stack<string> largeS = new Stack<string>();
        }
        public void LargeItemsAdd()
        {
            string usersInput2, tempValue;
            int tempValueI = 0;
            bool attempt = false;//, whichOne = false;
            Console.WriteLine("Would you like to remove or add an item to the storage area \n Reply add OR remove");
            string usersInput = Console.ReadLine();
            usersInput = usersInput.ToLower();

            if (usersInput.Contains("remove"))
            {
                LargeItemsRemove(largeS);
                return;
            }
            else if (usersInput.Contains("add"))
            {

                Console.WriteLine("Please input (numerically) how many IDs you'd like to add");
                tempValue = Console.ReadLine();
                attempt = int.TryParse(tempValue, out tempValueI);
                while (!attempt)
                {
                    Console.WriteLine("Please input (numerically) how many IDs you'd like to add, you did not input a numeric value last time");
                    tempValue = Console.ReadLine();
                    attempt = int.TryParse(tempValue, out tempValueI);
                }
                for (int i = 0; i < tempValueI; i++)
                {

                    Console.WriteLine("Please input the ID's (one at a time) of the item you would like to add");
                    usersInput2 = Console.ReadLine();
                    if (largeS.Contains(usersInput2))
                    {
                        Console.WriteLine("That ID has already been stored");
                    }
                    else
                    {
                        largeS.Push(usersInput2);
                    }
                }
                foreach (var item in largeS)
                {
                    Console.WriteLine("Current (large) item ID's: " + item);
                }
            }

        }
        public void LargeItemsRemove(Stack<string> largeS)
        {
            if (largeS.Contains(null))
            {
                Console.WriteLine("No IDs stored");
            }
            else
            {

                string popped = largeS.Pop();
                foreach (var item in largeS)
                {
                    Console.WriteLine("Pop: " + item);
                }
                Console.WriteLine("Removed ID = " + popped);
            }
        }

    }
}
名称空间库存管理
{
类大项目1
{
私有堆栈大容量;
公共大型项目1()
{
Stack largeS=新堆栈();
}
公共无效的大项目
{
字符串usersInput2,tempValue;
int tempValueI=0;
bool-trument=false;/,whichOne=false;
Console.WriteLine(“是否要将项目删除或添加到存储区域\n答复添加或删除”);
字符串usersInput=Console.ReadLine();
usersInput=usersInput.ToLower();
if(usersInput.Contains(“remove”))
{
大项目搬迁(大项目);
返回;
}
else if(usersInput.Contains(“add”))
{
WriteLine(“请输入(数字)您要添加多少ID”);
tempValue=Console.ReadLine();
尝试=int.TryParse(tempValue,out tempValueI);
而(!尝试)
{
WriteLine(“请输入(数字)您要添加的ID数量,您上次没有输入数字值”);
tempValue=Console.ReadLine();
尝试=int.TryParse(tempValue,out tempValueI);
}
对于(int i=0;i

我不知道如何将我的值分配给实例。我将感谢任何能提供的帮助

更改构造函数以初始化字段而不是局部变量:

public LargeItems1()
{
    this.largeS = new Stack<string>();
}
public LargeItems1()
{
this.largeS=新堆栈();
}

您必须使用
this
关键字以以下方式初始化字段
largeS

this.largeS = new Stack<string>();
您只是初始化一个新的局部变量,它与您的私有字段无关


查看MSDN文档中的关键字。

您需要将其定义为字段或属性,而不是构造函数中的局部变量。编辑:关于类的更多信息:EDITx2:Oops,忽略了它被声明为一个字段的事实,我现在看到它的格式是固定的;谢谢你,蒂姆。很好的解释!!谢谢,我只是在MSDN上查找这个关键字,你的解释帮助我理解了:)。
Stack<string> largeS = new Stack<string>();