获得Combobox选定值给定错误 [英] Getting Combobox Selected Value Given Error

问题描述

先生我



从数据库绑定后获得组合框

sir i

when ever i m getting combobox after binding from database

BusinessLayer blayar = new BusinessLayer();
            DataTable dt = blayar.getproductType(Global.CompanyId);
            cmbProType.DataSource = dt;
            if (dt.Rows.Count > 0)
            {
                cmbProType.DisplayMember = "Type";
                cmbProType.ValueMember = "id";
            }

然后Chenge index //代码

and then Chenge index //code

private void cmbProType_SelectedIndexChanged(object sender, EventArgs e)
        {
            bType = true;
            if (bType)
            {
                int counter;
                int id_ProductType=Convert.ToInt32(cmbProType.SelectedValue);// Getting  Error IConvetable System.row.RowDataView like this 
                BusinessLayer blayer = new BusinessLayer();
                DataTable dt = new DataTable();
                counter = blayer.ChecksubTypeofType(id_ProductType);
                if (counter > 0)
                {
                    dt = blayer.getProductSubtype(id_ProductType);
                    if (dt.Rows.Count > 0)
                    {
                        cmbProdSubType.DataSource = dt;
                        cmbProdSubType.DisplayMember = "Type";
                        cmbProdSubType.ValueMember = "id";
                    }

                }
                else
                {
                    dt = blayer.getProductByTypeID(id_ProductType);
                    DGviewList.DataSource = dt;
  
                 
                }
            }
            else
                bType = false;
        }

先生如何解决这个问题

sir how to solve this problem

推荐答案

您已将数据源提供给您的组合框，但您没有绑定它在您的代码中添加一行

You have giving the data source to your Combo box, but you had not bind it Add one line to your code

BusinessLayer blayar = new BusinessLayer();
       DataTable dt = blayar.getproductType(Global.CompanyId);
       cmbProType.DataSource = dt;
       if (dt.Rows.Count > 0)
       {
           cmbProType.DisplayMember = "Type";
           cmbProType.ValueMember = "id";
       }
       cmbProType.dataBind();             // Add this line

BusinessLayer blayar = new BusinessLayer();
            DataTable dt = blayar.getproductType(Global.CompanyId);
            cmbProType.DataSource = dt;
            if (dt.Rows.Count > 0)
            {
                cmbProType.DisplayMember = "Type";
                cmbProType.ValueMember = "id";
                cmbProType.DataBind();

            }

private void cmbProType_SelectedIndexChanged(object sender, EventArgs e)
        {
            bType = true;
            if (bType)
            {
                int counter;
                int id_ProductType=Convert.ToInt32(cmbProType.SelectedValue);// Getting  Error IConvetable System.row.RowDataView like this 
                BusinessLayer blayer = new BusinessLayer();
                DataTable dt = new DataTable();
                counter = blayer.ChecksubTypeofType(id_ProductType);
                if (counter > 0)
                {
                    dt = blayer.getProductSubtype(id_ProductType);
                    if (dt.Rows.Count > 0)
                    {
                        cmbProdSubType.DataSource = dt;
                        cmbProdSubType.DisplayMember = "Type";
                        cmbProdSubType.ValueMember = "id";
                         cmbProdSubType.DataBind();
                    }
 
                }
                else
                {
                    dt = blayer.getProductByTypeID(id_ProductType);
                    DGviewList.DataSource = dt;
                    DGviewList.DataBind();
                 
                }
            }
            else
                bType = false;
        }

这篇关于获得Combobox选定值给定错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！