无法将类型为“ System.Web.UI.WebControls.ListItem”的对象转换为类型为“ System.IConvertible”的对象

Question

I am facing this but unable to solve it.This are from List. Having the problem at 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

Thx to grek and derloopkat. Grek's hint: the problem can be anywhere within the statement that starts in the error line

There are 3 parts that I changed.

1. I cannot have 2 gvTriggerProduct.

2. One part in my existing code(not here). Missing ".Value". Grek's hint 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() };