Question

我有一个购物车，当我点击按钮[“添加到购物车”]时，它突出显示为蓝色并将其名称更改为[“添加到购物车”]。但是，我希望它没有突出显示，并将名称更改回“添加到购物车”。代码很长，但我希望你们可以帮助我。这是我的添加到购物车按钮代码：

using System.IO;

编辑了精彩购物车代码

protected void btnAddToCart_Click(object sender, EventArgs e)
    {
        string ProductID = Convert.ToInt16((((Button)sender).CommandArgument)).ToString();
        string ProductQuantity = "1";

        DataListItem currentItem = (sender as Button).NamingContainer as DataListItem;
        Label lblAvailableStock = currentItem.FindControl("lblAvailableStock") as Label;

        if (Session["MyCart"] != null)
        {
            DataTable dt = (DataTable)Session["MyCart"];
            var checkProduct = dt.AsEnumerable().Where(r => r.Field<string>("ProductID") == ProductID); // check whether product is already added or not
            if (checkProduct.Count() == 0)
            {
                string query = "select * from Products where ProductID = " + ProductID + "";
                DataTable dtProducts = GetData(query);

                DataRow dr = dt.NewRow();
                dr["ProductID"] = ProductID;
                dr["Name"] = Convert.ToString(dtProducts.Rows[0]["Name"]);
                dr["Description"] = Convert.ToString(dtProducts.Rows[0]["Description"]);
                dr["Price"] = Convert.ToString(dtProducts.Rows[0]["Price"]);
                dr["ImageUrl"] = Convert.ToString(dtProducts.Rows[0]["ImageUrl"]);
                dr["ProductQuantity"] = ProductQuantity;
                dr["AvailableStock"] = lblAvailableStock.Text;
                dt.Rows.Add(dr);

                Session["MyCart"] = dt;
                btnIslandGas.Text = dt.Rows.Count.ToString();
            }
            else
            {
                if (checkProduct.Count() != 0)
                {
                    var ProductRowToBeDeleted = dt.Select("ProductID =" + ProductID);
                    foreach (var row in ProductRowToBeDeleted)
                    {
                        row.Delete();
                        btnIslandGas.Text = dt.Rows.Count.ToString();
                    }
                }
            }
        }
        else
        {
            string query = "select * from Products where ProductID = " + ProductID + "";
            DataTable dtProducts = GetData(query);

            DataTable dt = new DataTable(); //storing all of the records

            dt.Columns.Add("ProductID", typeof(string)); // adding the columns
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("Description", typeof(string));
            dt.Columns.Add("Price", typeof(string));
            dt.Columns.Add("ImageUrl", typeof(string));
            dt.Columns.Add("ProductQuantity", typeof(string));
            dt.Columns.Add("AvailableStock", typeof(string));

            DataRow dr = dt.NewRow(); //adding the rows
            dr["ProductID"] = ProductID;
            dr["Name"] = Convert.ToString(dtProducts.Rows[0]["Name"]);
            dr["Description"] = Convert.ToString(dtProducts.Rows[0]["Description"]);
            dr["Price"] = Convert.ToString(dtProducts.Rows[0]["Price"]);
            dr["ImageUrl"] = Convert.ToString(dtProducts.Rows[0]["ImageUrl"]);
            dr["ProductQuantity"] = ProductQuantity;
            dr["AvailableStock"] = lblAvailableStock.Text;  

            dt.Rows.Add(dr); //adding the data row in the data table. 

            Session["MyCart"] = dt; //asigning the datatable in the session.
            btnIslandGas.Text = dt.Rows.Count.ToString();
        }
        HighLightCartProducts();
    }

并添加了删除突出显示代码

private void HighLightCartProducts()
    {
        if (Session["MyCart"] != null)
        {
            DataTable dtProductsAddedToCart = (DataTable)Session["MyCart"];
            if (dtProductsAddedToCart.Rows.Count > 0)
            {
                foreach (DataListItem item in dlProducts.Items)
                {
                    HiddenField hfProductID = item.FindControl("hfProductID") as HiddenField; // Getting hidden filed value
                    if (dtProductsAddedToCart.AsEnumerable().Any(row => hfProductID.Value == row.Field<String>("ProductID")))
                    {
                        //item.BackColor =  System.Drawing.Color.Red;

                        Button btnAddToCart = item.FindControl("btnAddToCart") as Button; //item.FinControl finds the item(Button)
                        btnAddToCart.BackColor = System.Drawing.Color.Blue;
                        btnAddToCart.ForeColor = System.Drawing.Color.White;
                        btnAddToCart.Text = "Added to Cart";

                        Image imgGreenstar = item.FindControl("imgStar") as Image;
                        imgGreenstar.Visible = true;
                    }
                    else
                    {
                        Button btnAddToCart = item.FindControl("btnAddToCart") as Button;
                        btnAddToCart.BackColor = System.Drawing.Color.White;
                        btnAddToCart.ForeColor = System.Drawing.Color.Black;
                        btnAddToCart.Text = "Add to Cart";
                        Image imgGreenstar = item.FindControl("imgStar") as Image;
                        imgGreenstar.Visible = false;
                    }
                }
            }
        }
    }

Answer 1

只需在代码中添加此代码，它会检查产品是否已添加到购物车，然后将其从购物车中删除并删除突出显示。我建议使用单独的方法来突出显示和删除突出显示。

 protected void btnAddToCart_Click(object sender, EventArgs e)
{
    string ProductID = Convert.ToInt16((((Button)sender).CommandArgument)).ToString();
    string ProductQuantity = "1"; 

    DataListItem currentItem = (sender as Button).NamingContainer as DataListItem;
    Label lblAvailableStock = currentItem.FindControl("lblAvailableStock") as Label;

    if (Session["MyCart"] != null)
    {
        DataTable dt = (DataTable)Session["MyCart"];
        var checkProduct = dt.AsEnumerable().Where(r => r.Field<string>("ProductID") == ProductID); // check whether product is already added or not
        if (checkProduct.Count() == 0)
        {
            string query = "select * from Products where ProductID = " + ProductID + "";
            DataTable dtProducts = GetData(query);

            DataRow dr = dt.NewRow();
            dr["ProductID"] = ProductID;
            dr["Name"] = Convert.ToString(dtProducts.Rows[0]["Name"]);
            dr["Description"] = Convert.ToString(dtProducts.Rows[0]["Description"]);
            dr["Price"] = Convert.ToString(dtProducts.Rows[0]["Price"]);
            dr["ImageUrl"] = Convert.ToString(dtProducts.Rows[0]["ImageUrl"]);
            dr["ProductQuantity"] = ProductQuantity;
            dr["AvailableStock"] = lblAvailableStock.Text;
            dt.Rows.Add(dr);
            Session["MyCart"] = dt;
            btnIslandGas.Text = dt.Rows.Count.ToString();
            HighLightCartProducts();
        }
        else
        {
           RemoveHighLightCartProducts(ProductId);
        }
    }
    else
    {
        string query = "select * from Products where ProductID = " + ProductID + "";
        DataTable dtProducts = GetData(query);

        DataTable dt = new DataTable(); //storing all of the records

        dt.Columns.Add("ProductID", typeof(string)); // adding the columns
        dt.Columns.Add("Name", typeof(string));
        dt.Columns.Add("Description", typeof(string));
        dt.Columns.Add("Price", typeof(string));
        dt.Columns.Add("ImageUrl", typeof(string));
        dt.Columns.Add("ProductQuantity", typeof(string));
        dt.Columns.Add("AvailableStock", typeof(string));

        DataRow dr = dt.NewRow(); //adding the rows
        dr["ProductID"] = ProductID;
        dr["Name"] = Convert.ToString(dtProducts.Rows[0]["Name"]);
        dr["Description"] = Convert.ToString(dtProducts.Rows[0]["Description"]);
        dr["Price"] = Convert.ToString(dtProducts.Rows[0]["Price"]);
        dr["ImageUrl"] = Convert.ToString(dtProducts.Rows[0]["ImageUrl"]);
        dr["ProductQuantity"] = ProductQuantity;
        dr["AvailableStock"] = lblAvailableStock.Text;  

        dt.Rows.Add(dr); //adding the data row in the data table. 

        Session["MyCart"] = dt; //asigning the datatable in the session.
        btnIslandGas.Text = dt.Rows.Count.ToString();
        HighLightCartProducts();
    }

}


private void HighLightCartProducts()
{
    if (Session["MyCart"] != null)
    {
        DataTable dtProductsAddedToCart = (DataTable)Session["MyCart"];
        if (dtProductsAddedToCart.Rows.Count > 0)
        {
            foreach (DataListItem item in dlProducts.Items)
            {
                HiddenField hfProductID = item.FindControl("hfProductID") as HiddenField; // Getting hidden filed value
                if (dtProductsAddedToCart.AsEnumerable().Any(row => hfProductID.Value == row.Field<String>("ProductID")))
                {
                    //item.BackColor =  System.Drawing.Color.Red;

                    Button btnAddToCart = item.FindControl("btnAddToCart") as Button; //item.FinControl finds the item(Button)
                    btnAddToCart.BackColor = System.Drawing.Color.Blue;
                    btnAddToCart.ForeColor = System.Drawing.Color.White;
                    btnAddToCart.Text = "Added to Cart";
                    Image imgGreenstar = item.FindControl("imgStar") as Image;
                    imgGreenstar.Visible = true;
                }                    
            }
        }
    }
}


    private void RemoveHighLightCartProducts(string ProductId)

{

if (Session["MyCart"] != null)
{
    DataTable dtProductsAddedToCart = (DataTable)Session["MyCart"];
    //delete row which contains product data.

    var ProductRowToBeDeleted = dtProductsAddedToCart.Select("ProductID =" + ProductId);
    foreach (var row in ProductRowToBeDeleted)
    {
        row.Delete();
    }
    foreach (DataListItem item in dlProducts.Items)
    {
     //if (dtProductsAddedToCart.AsEnumerable().Any(row => ProductID!=row.Field<String>("ProductID")))
     foreach((DataRow rw in dtProductsAddedToCart.Rows)
     {
        if(rw["ProductID"])!=ProductID)
        {
            Button btnAddToCart = item.FindControl("btnAddToCart") as Button; //item.FinControl finds the item(Button)
            btnAddToCart.BackColor = System.Drawing.Color.Blue;
            btnAddToCart.ForeColor = System.Drawing.Color.White;
            btnAddToCart.Text = "Added to Cart";
            Image imgGreenstar = item.FindControl("imgStar") as Image;
            imgGreenstar.Visible = true;
        }
        else
        {
            Button btnAddToCart = item.FindControl("btnAddToCart") as Button;
            btnAddToCart.BackColor = System.Drawing.Color.Red;
            btnAddToCart.ForeColor = System.Drawing.Color.White;
            btnAddToCart.Text = "Add to Cart";
            Image imgGreenstar = item.FindControl("imgStar") as Image;
            imgGreenstar.Visible = false;
        }
     }

    }
}

}

再次单击按钮后如何删除所选产品？

1 个答案: