爲什麼這個簡單的LINQ to SQL更新查詢不起作用？

Question

我使用VS 2010，MS SQL Server 2008中，WPF 4

PalQuotationDataContext _palQuotationDataContext = new PalQuotationDataContext(); 
public void UpdateItemInformation(EItemInformation anItemInformation) 
{ 
    var itemInformation = _palQuotationDataContext.ITEMs.Single(item => 
             item.IM_ID == anItemInformation.Id); 
    itemInformation.IM_NAME = anItemInformation.Name; 
    itemInformation.IM_DESCRIPTION = anItemInformation.Description; 
    itemInformation.IM_BRAND = anItemInformation.Brand; 
    itemInformation.IM_ORIGIN = anItemInformation.Origin; 
    itemInformation.IM_ACESS_BY = anItemInformation.AccessBy; 

    _palQuotationDataContext.SubmitChanges(); 
} 

Answer 1

你的表需要primary key。