使用GridView生成数据表

我有网格视图，在网格视图中，我有一个按钮，在选择该按钮时，我需要在数据表中插入/更新记录。 如果在数据表中有值，那么qty字段将增加1。 在数据表中插入带有数量1的新行。 现在问题出在GridView1_RowCommand我正在编写这段代码。 但它在数据表中给出了错误的值。 我的代码写在下面。 请帮我。

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) { if (e.CommandName == "datacommand") { DataTable dt = new DataTable(); if (Session["product_id"] != null) { dt = (DataTable)Session["product_id"]; } DataRow dr; //dt.Rows[0]["qty"] = data; if (dt.Rows.Count<=0) { dt.Columns.Add("product_id", typeof(Int32)); dt.Columns.Add("qty", typeof(int)); dt.Columns.Add("price", typeof(double)); dt.Columns.Add("total", typeof(double)); dr = dt.NewRow(); dr["product_id"] = e.CommandArgument; dr["qty"] = 1; dr["price"] = Convert.ToDouble(GridView1.Rows[0].Cells[3].Text); dr["total"] = Convert.ToInt32(dr["qty"]) * Convert.ToDouble(dr["price"]); dt.Rows.Add(dr); dt.AcceptChanges(); Session["product_id"] = dt; Response.Write(" One time"); } else { //dt = Session["product_id"]; for (int i = 0; i < dt.Rows.Count; i++) { if (dt.Rows[i]["product_id"].ToString() == e.CommandArgument) { dr = dt.NewRow(); dt.Rows[i]["qty"] = Convert.ToInt32(dt.Rows[i]["qty"])+ 1; dt.Rows[i]["total"] = Convert.ToInt32(dt.Rows[i]["qty"]) * Convert.ToDouble(dt.Rows[i]["price"]); Session["product_id"] = dt; dt.AcceptChanges(); Response.Write(dt); } } dr = dt.NewRow(); dr["product_id"] = e.CommandArgument; dr["qty"] = 1; dr["price"] = Convert.ToDouble(GridView1.Rows[0].Cells[3].Text); dr["total"] = Convert.ToInt32(dr["qty"]) * Convert.ToDouble(dr["price"]); dt.Rows.Add(dr); dt.AcceptChanges(); Session["product_id"] = dt; } //GridViewRow row= e.CommandArgument ////DataColumn prodid = new DataColumn("product_id", typeof(System.Int32)); ////dt.Columns.Add(prodid); ////DataColumn qty = new DataColumn("qty", typeof(System.Int32)); ////dt.Columns.Add(qty); //int index = Convert.ToInt32(e.CommandArgument); //GridViewRow row = GridView1.Rows[index]; //AddShopCart(row.Cells[1].Text.ToString()); } } 

Answer 1

 protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) { if (e.CommandName == "datacommand") { DataTable dt = new DataTable(); if (Session["product_id"] != null) { dt = (DataTable)Session["product_id"]; } DataRow dr; if (dt.Rows.Count<=0) { dt.Columns.Add("product_id", typeof(Int32)); dt.Columns.Add("qty", typeof(int)); dt.Columns.Add("price", typeof(double)); dt.Columns.Add("total", typeof(double)); dr = dt.NewRow(); dr["product_id"] = e.CommandArgument; dr["qty"] = 1; dr["price"] = Convert.ToDouble(GridView1.Rows[0].Cells[3].Text); dr["total"] = Convert.ToInt32(dr["qty"]) * Convert.ToDouble(dr["price"]); dt.Rows.Add(dr); dt.AcceptChanges(); Session["product_id"] = dt; Response.Write(""); } else { string aa="new"; for (int i = 0; i < dt.Rows.Count; i++) { if (dt.Rows[i]["product_id"].ToString() == e.CommandArgument) { aa="dup"; } } if(aa=="dup") { for (int j = 0; j < dt.Rows.Count; j++) { if (dt.Rows[j]["product_id"].ToString() == e.CommandArgument) { // aa="dup"; dt.Rows[j]["qty"]=Convert.ToString( Convert.ToInt32( dt.Rows[j]["qty"])+1); dt.AcceptChanges(); } } Session["product_id"]=dt; } else { dt.Columns.Add("product_id", typeof(Int32)); dt.Columns.Add("qty", typeof(int)); dt.Columns.Add("price", typeof(double)); dt.Columns.Add("total", typeof(double)); DataRow dr1=dt.NewRow() ; dr1["product_id"] = e.CommandArgument; dr1["qty"] = 1; dr1["price"] = Convert.ToDouble(GridView1.Rows[0].Cells[3].Text); dr1["total"] = Convert.ToInt32(dr["qty"]) * Convert.ToDouble(dr["price"]); dt.Rows.Add(dr); dt.AcceptChanges(); Session["product_id"] = dt; } } } } 

所以这就是答案

Answer 2

首先为属性创建Class，您可以修改它然后使用。

 public class myclass { public int product_id { get; set; } public int qty { get; set; } public double price { get; set; } public double total { get; set; } } 

然后你可以在GridView1_RowCommand事件中添加你的代码。

 private List productDetails = new List(); protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) { if (e.CommandName == "datacommand") { int productId = Convert.ToInt32(e.CommandArgument.ToString()); bool isexist = productDetails.Any(p => p.product_id == productId); if (isexist) { myclass product = productDetails.Where(p => p.product_id == productId).FirstOrDefault(); productDetails.Add(new myclass { product_id = product.product_id, price = product.price, qty = product.qty + 1, total = Convert.ToDouble((product.price) * (product.qty + 1)) }); } else { double productPrice = Convert.ToDouble(GridView1.Rows[0].Cells[3].Text); double productTotal = productPrice * 1; productDetails.Add(new myclass { product_id = Convert.ToInt32(e.CommandArgument.ToString()), price = productPrice, qty = 1, total = productTotal }); } } }