【发布时间】：2015-09-27 22:43:52
【问题描述】：
我想要做的是，当用户单击按钮（“添加到购物车”）时，它会更改其颜色并更改为（“添加到购物车”），这是我设法做到的。
我的查询是当用户再次单击“添加到购物车”按钮时，突出显示关闭并返回到 (“添加到购物车”) 。一切正常，但是，当我尝试从突出显示中删除所有产品时，一个产品仍然突出显示。例如，我添加了 4 个产品，当我决定将它们从添加中删除时，一个产品保持突出显示并具有“已添加到购物车”文本。
这里是按钮点击的代码：
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();
}
这是高亮产品的代码（工作正常）
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;
}
}
}
}
}
以及取消高亮方法：
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)
{
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;
}
}
}
请帮帮我，我真的需要完成这项工作。谢谢你的认可。
【问题讨论】：
-
“当我尝试从突出显示中删除所有产品时”您在此步骤中在做什么
-
我点击了 btn addtocart。 @MicrosoftDN
-
我想做的就像facebook上的like和unlik按钮。当您第一次单击它时，它将突出显示并更改要添加到购物车的文本。第二次点击它，它会回到原来的颜色和文字（添加到购物车）@MicrosoftDN
-
真的无法弄清楚我在这里缺少什么。总是有一个产品被突出显示但被删除但它被突出显示。请帮助我@MicrosoftDN