'BO.Bo._Name'永远不会被赋值，并且它的默认值是null，它是什么？

问题描述

BusinessObjects中的代码

Code in BusinessObjects

public class Bo
   {
       private string _Name;
       private string _Address;
       private string _Phone;
       public string Name
       {
           set { value = _Name; }
           get { return _Name; }
       }
       public string Address
       {
           set { value = _Address; }
           get { return _Address; }
       }
       public string Phone
       {
           set { value = _Phone; }
           get { return _Phone; }
       }
   }

BUsiness逻辑层中的代码

Code in BUsiness Logic Layer

public class Bll
   {
      public void insertstudent(Bo objbo)
      {
          Dal objdal = new Dal();
          objdal.insertstudentdetails(objbo);
      }
   }

DataAccessLayer中的代码

Code in DataAccessLayer

string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
public void insertstudentdetails(Bo objbo)
{
    using (SqlConnection con = new SqlConnection(cs))
    {
        using (SqlCommand cmd = new SqlCommand("spinserttblstudent", con))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@Name",objbo.Name);
            cmd.Parameters.AddWithValue("@Address",objbo.Address);
            cmd.Parameters.AddWithValue("@Phone", objbo.Phone);
            con.Open();
            cmd.ExecuteNonQuery();
            cmd.Dispose();
        }

    }
}

代码隐藏在文件背后



protected void btninsert_Click（object sender，EventArgs e）

{

Bo objbo = new Bo（）;

objbo.Name = txtname.Text;

objbo.Address = txtaddress.Text;

objbo.Phone = txtphone.Text;

Bll objbll = new Bll（）;

objbll.insertstudent（objbo）;



}



当我构建应用程序时，我得到编译错误说明





D：\\ \\ today3-tier \ WebApplication1 \ BO\Bo.cs（10,24）：警告CS0649：字段'BO.Bo._Name'永远不会分配给，并且将始终具有其默认值null

D：\today3-tier \WebApplication1 \ BO\Bo.cs（11,24）：警告CS0649：从未分配字段'BO.Bo._Address'，并且将始终具有其默认值null

D：\today3-tier\WebApplication1\BO\Bo.cs（12,24）：警告CS0649：字段'BO.Bo._PhoneNumber '永远不会被赋予，并且总是将其默认值为null



如何摆脱它们是什么意思？

code in code behind file

protected void btninsert_Click(object sender, EventArgs e)
{
Bo objbo = new Bo();
objbo.Name = txtname.Text;
objbo.Address = txtaddress.Text;
objbo.Phone = txtphone.Text;
Bll objbll = new Bll();
objbll.insertstudent(objbo);

}

When i build the application i'am getting compilation error stating that


D:\today3-tier\WebApplication1\BO\Bo.cs(10,24): warning CS0649: Field 'BO.Bo._Name' is never assigned to, and will always have its default value null
D:\today3-tier\WebApplication1\BO\Bo.cs(11,24): warning CS0649: Field 'BO.Bo._Address' is never assigned to, and will always have its default value null
D:\today3-tier\WebApplication1\BO\Bo.cs(12,24): warning CS0649: Field 'BO.Bo._PhoneNumber' is never assigned to, and will always have its default value null

What does it mean how to get rid of them?

推荐答案

public string Name
{
    set { _Name = value; }
    get { return _Name; }
}
public string Address
{
    set { _Address= value; }
    get { return _Address; }
}
public string Phone
{
    set { _Phone= value; }
    get { return _Phone; }
}

check []

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