'object'不包含'Add'的定義，並且沒有可以找到接受類型'object'的第一個參數的擴展方法'Add'

Question

public partial class consignmentshop : Form 
{ 
    private Store store = new Store(); 
    private object FristName; 
    private string LastName; 

    public consignmentshop() 
    { 
     InitializeComponent(); 
     SetupData(); 
    } 

    private void SetupData() 
    { 
     store.Vendor.Add(new Vendor { FristName = "bill" ,LastName = "smith"}); 
     store.Vendor.Add(new Vendor { FristName = "sue", LastName = "smith" }); 
    } 
} 


namespace ConsignmetShopLibrary1 
{ 
    public class Store 
    { 
     public readonly object Vendor ; 
     public string Name { get; set; } 
     public List<Vendor> Vendors { get; set; } 
     public List<Item> Items { get; set; } 
     public Store() 
     { 
      Vendors = new List<Vendor>(); 
      Items = new List<Item>(); 
     } 
    } 
} 

Answer 1

的問題是在類店：

public readonly object Vendor;

我猜你真正想打電話是Vendors.Add而不是Vendor.Add你最初在你的問題的第一個版本一樣。

Answer 2

代替Vendor，您必須在Vendors集合中添加項目。

void SetupData() { store.Vendors.Add(new Vendor { FristName = "bill" ,LastName = "smith"}); store.Vendors.Add(new Vendor { FristName = "sue", LastName = "smith" }); }