gridview不添加多行 [英] gridview not adding multiple rows

问题描述

 DataTable dt = 新 DataTable();
            DataRow dr = dt.NewRow();
            DataColumn col = 新 DataColumn(); ;
            col = 新 DataColumn("  );
            dt.Columns.Add(col);
            col = 新 DataColumn("  );
            dt.Columns.Add(col);
            col = 新 DataColumn("  );
            dt.Columns.Add(col);
            col = 新 DataColumn("  );
            dt.Columns.Add(col);
            dr [" ] = 此 .drpdwnmedicine_name.SelectedValue;
            dr [" ] = 此 .drpdwnmanufacturer_name.SelectedValue;
            dr [" ] = 此 .dosage.Value;
            dr [" ] = 此 .quantity.Value;
            dt.Rows.Add(dr);
            //  dt.AcceptChanges(); 
 
            displaycartgridview.DataSource = dt;
            displaycartgridview.DataBind(); 

亲爱的大家...
上面的代码可以正常工作..但是它不会添加多行..它只会创建一行="h2_lin">解决方案

在这里您每次都会创建一个新的数据表，此方法被调用，因此所有行都将丢失.

DataTable dt = new DataTable();

您应该将表的创建和向不同的方法添加行分开，以便一次创建表 ，然后将行添加到表中.

为没有您要在循环中添加的行数将类似
的代码放入

DataRow dr = dt.NewRow();
dr ["col1"] = this.drpdwnmedicine_name.SelectedValue;
dr ["col2"] = this.drpdwnmanufacturer_name.SelectedValue;
dr ["col3"] = this.dosage.Value;
dr ["col4"] = this.quantity.Value;
dt.Rows.Add(dr);



并在填充数据表后将gridview绑定到循环外


希望对您有所帮助

DataTable dt = new DataTable();
            DataRow dr = dt.NewRow();
            DataColumn col = new DataColumn(); ;
            col = new DataColumn("col1");
            dt.Columns.Add(col);
            col = new DataColumn("col2");
            dt.Columns.Add(col);
            col = new DataColumn("col3");
            dt.Columns.Add(col);
            col = new DataColumn("col4");
            dt.Columns.Add(col);
            dr["col1"] = this.drpdwnmedicine_name.SelectedValue;
            dr["col2"] = this.drpdwnmanufacturer_name.SelectedValue;
            dr["col3"] = this.dosage.Value;
            dr["col4"] = this.quantity.Value;
            dt.Rows.Add(dr);
            //dt.AcceptChanges();
 
            displaycartgridview.DataSource = dt;
            displaycartgridview.DataBind();

dear everyone...
the above code works fine..but it s not adding multiple rows..only one row it s creating ..then if we add one more row it is replacing old rows..so pls help me to come out from this

解决方案

Here you create a new data table every time this method is called, so all rows are lost.

DataTable dt = new DataTable();

You should separate the table creation and row adding to different methods so that the table is created once and then the rows are added to it.

make a loop for the no. of rows you want to add in the loop put the codes like


DataRow dr = dt.NewRow();
dr["col1"] = this.drpdwnmedicine_name.SelectedValue;
dr["col2"] = this.drpdwnmanufacturer_name.SelectedValue;
dr["col3"] = this.dosage.Value;
dr["col4"] = this.quantity.Value;
dt.Rows.Add(dr);



and bind the gridview outside the loop after filling the datatable


hope this will help

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