小编Hos*_*Ali的帖子

我有以下代码.我收到错误:

转换为值类型'System.Int32'失败,因为实现的值为null.结果类型的泛型参数或查询必须使用可空类型.

var productItem =   from sales 
                      in db.Sales_inv_details
                  select new { 
                           sales.Sales_Invoices.Customer.Cust_Id, 
                           sales.Sales_Invoices.Customer.Customer_Name,         
                           sales.Sales_Invoices.Employe.Emp_Name, 
                           sales.Sales_Invoices.Employe.Emp_code,
                           sales.Sales_Invoices.Date_invoice, 
                           sales.Item.Item_ID, 
                           sales.Qty, 
                           sales.Qty_Price, 
                           sales.Item.Item_Name, 
                           sales.Item.Item_Code, 
                           Unit_Measure = sales.Item.TBL_Unit_Measure.Code,
                           sales.Sales_Invoices.Descrption, 
                           sales.disc };

productItem = productItem
  .Where(x => (x.Date_invoice >= model.Fromdate & x.Date_invoice <= (model.Todate)));

productItem = productItem
  .Where(x => (x.Emp_code == model.Emp_code));