无法将类型为“System.Web.UI.WebControls.ListItem”的对象强制转换为“System.IConvertible”类型

Question

我正面对这个但无法解决它。这来自List。遇到问题 AddOnTriggerItems = gvTriggerProduct.Rows.Cast<GridViewRow>().Select(rowItem => new AddOnTriggerItem()

ProjectA.TEST.BE.AddOn addOn = new ProjectA.TEST.BE.AddOn()
{    
    AddCode = addCode,          
    CreatedTime = DateTime.Now,
    ModifiedTime = DateTime.Now,
    AddOnTriggers = gvTriggerProduct.Rows.Cast<GridViewRow>().Select(row => new AddOnTrigger()
    {
        AddOnTriggerItems = gvTriggerProduct.Rows.Cast<GridViewRow>().Select(rowItem => new AddOnTriggerItem()
        {
            ProductTypeID = gvTriggerProduct.Rows[rowItem.RowIndex].Cells[1].Text.ToString(),
            ProductCode = gvTriggerProduct.Rows[rowItem.RowIndex].Cells[2].Text.ToString(),     
            CreatedTime = DateTime.Now,
            ModifiedTime = DateTime.Now
        }).ToList(),
        ActiveStatus = 1,
        CreatedTime = DateTime.Now,
        ModifiedTime = DateTime.Now
    }).ToList(),
    AddOnProducts = gvAddOnProduct.Rows.Cast<GridViewRow>().Select(rowAddOnProducts => new AddOnProduct()
    {
        ProductTypeID = gvAddOnProduct.Rows[rowItem.RowIndex].Cells[2].Text.ToString(), 
        ProductCode = gvAddOnProduct.Rows[rowItem.RowIndex].Cells[2].Text.ToString(),   
        CreatedTime = DateTime.Now,
        ModifiedTime = DateTime.Now,
        AddOnProductAllotments = addOnProductAllotmentSession.Where(p => (p.ProductID == (Convert.ToString(((HiddenField)rowAddOnProducts.FindControl("ProductID")).Value)))).ToList(),      
    }).ToList()
};

Answer 1

谢谢grek和derloopkat。 Grek的提示：问题可以在语句中从错误行开始的任何地方

我改变了3个部分。

1. 我不能拥有2个gvTriggerProduct。

2. 我现有代码中的一部分（不在此处）。缺少“.Value”。 Grek的提示Convert.ToByte（（（DropDownList）rowItem.FindControl（“ddlMinTriggerQuantity”））。SelectedItem

3. Error: Cannot implicitly convert type 'void' to 'System.Collections.Generic.List'

    List<AddOnTrigger> triggerlist = new List<AddOnTrigger>();
   triggerList.Add(new AddOnTrigger
   {
    AddOnTriggerItems = gvTriggerProduct.Rows.Cast<GridViewRow>().Select(rowItem => new AddOnTriggerItem()
   {
       ProductTypeID = gvTriggerProduct.Rows[rowItem.RowIndex].Cells[1].Text.ToString(),
       ProductCode = gvTriggerProduct.Rows[rowItem.RowIndex].Cells[2].Text.ToString(),     
       CreatedTime = DateTime.Now,
       ModifiedTime = DateTime.Now
   }).ToList(),
   ActiveStatus = 1,
   CreatedTime = DateTime.Now,
   ModifiedTime = DateTime.Now}
   });
   
   ProjectA.TEST.BE.AddOn addOn = new ProjectA.TEST.BE.AddOn()
   { 
      AddCode = addCode,          
      CreatedTime = DateTime.Now,
      ModifiedTime = DateTime.Now,
      AddOnTriggers = triggerlist
      AddOnProducts = gvAddOnProduct.Rows.Cast<GridViewRow>().Select(rowAddOnProducts => new AddOnProduct()
      {
         ProductTypeID =    gvAddOnProduct.Rows[rowItem.RowIndex].Cells[2].Text.ToString(),    
         ProductCode = gvAddOnProduct.Rows[rowItem.RowIndex].Cells[2].Text.ToString(), 
         CreatedTime = DateTime.Now,
         ModifiedTime = DateTime.Now,
         AddOnProductAllotments = addOnProductAllotmentSession.Where(p => (p.ProductID == (Convert.ToString(((HiddenField)rowAddOnProducts.FindControl("ProductID")).Value )))).ToList(),      
   }).ToList()
   
   };