选择查询不填充我的数据集ASP.NET C#

当我直接执行这个SELECT查询时，它就工作了。但是，在调试时，我看到我的数据集是空的。问题可能是什么

protected void Grid_ItemList_RowDataBound(object sender, GridViewRowEventArgs e)
        {

        if (e.Row.RowType == DataControlRowType.DataRow)
            {
            Connection con = new Connection();
            con.con = new SqlConnection(con.str);

            try
                {
                con.con.Open();
                con.cmd = new SqlCommand("Select Item_Code,Item_Name from Pharmacy_Item_M", con.con);
                var ddl = (DropDownList)e.Row.FindControl("ddlnames");
                SqlDataAdapter da = new SqlDataAdapter(con.cmd);
                DataSet ds = new DataSet();
                da.Fill(ds);
                con.con.Close();
                ddl.DataSource = ds;    
                ddl.DataTextField = "ItemName";
                ddl.DataValueField = "ItemCode";
                ddl.DataBind();

                }
            catch (Exception ex)
                {
                log.Warn("Unable to open connection");
                }
            }
        }

---

我正在学习教程。

这可能会对您有所帮助

protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //Find the DropDownList in the Row
        DropDownList ddlnames = (e.Row.FindControl("ddlnames") as DropDownList);
        ddlRole.DataSource = GetData("Select Item_Code,Item_Name from Pharmacy_Item_M");
        ddlRole.DataTextField = "Item_Name";
        ddlRole.DataValueField = "Item_Code";
        ddlRole.DataBind();

        //Add Default Item in the DropDownList
        ddlnames.Items.Insert(0, new ListItem("Please select"));

        //Select the role of user in DropDownList
        string x = (e.Row.FindControl("lblnames") as Label).Text;
        ddlnames.Items.FindByValue(x).Selected = true;
    }        
}

和在GetData函数中

 private DataSet GetData(string query)
{
    string conString = ConfigurationManager.ConnectionStrings["xxxx"].ConnectionString;
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter da = new SqlDataAdapter())
        {
            cmd.Connection = con;
            da.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                da.Fill(ds);
                return ds;
            }
        }
    }
}

---

也许这对你有帮助

protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //Find the DropDownList in the Row
        DropDownList ddlnames = (e.Row.FindControl("ddlnames") as DropDownList);
        ddlRole.DataSource = GetData("Select Item_Code,Item_Name from Pharmacy_Item_M");
        ddlRole.DataTextField = "Item_Name";
        ddlRole.DataValueField = "Item_Code";
        ddlRole.DataBind();

        //Add Default Item in the DropDownList
        ddlnames.Items.Insert(0, new ListItem("Please select"));

        //Select the role of user in DropDownList
        string x = (e.Row.FindControl("lblnames") as Label).Text;
        ddlnames.Items.FindByValue(x).Selected = true;
    }        
}

和在GetData函数中

 private DataSet GetData(string query)
{
    string conString = ConfigurationManager.ConnectionStrings["xxxx"].ConnectionString;
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter da = new SqlDataAdapter())
        {
            cmd.Connection = con;
            da.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                da.Fill(ds);
                return ds;
            }
        }
    }
}

---

您的值和文本字段：

ddl.DataTextField = "ItemName";
ddl.DataValueField = "ItemCode";

应与表select语句中的字段名匹配：

"Select Item_Code,Item_Name from...

---

您的值和文本字段：

ddl.DataTextField = "ItemName";
ddl.DataValueField = "ItemCode";

应与表select语句中的字段名匹配：

"Select Item_Code,Item_Name from...

---

你有任何异常吗？ItemName和ItemCode应该是Item_Name和Item_Code，也许吧？@RajeevKumar没有异常。它在填充数据集后为空。@markpsmith True。但是在到达之前它是空的。@sna2stha con.str正在从我的连接对象中提取连接字符串。这是完美的填充。您有任何异常吗？ItemName和ItemCode应该是Item_Name和Item_Code，也许吧？@RajeevKumar没有异常。它在填充数据集后为空。@markpsmith True。但是在到达之前它是空的。@sna2stha con.str正在从我的连接对象中提取连接字符串。非常好，非常感谢！在我的下拉列表itemName的SelectedIndexChanged上，我希望它填充同一gridview行中的itemCode文本框。我该怎么做呢？你在链接中给出的解决方案希望这会对你有很大帮助！在我的下拉列表itemName的SelectedIndexChanged上，我希望它填充同一gridview行中的itemCode文本框。我该怎么做呢？您在该链接中提供的解决方案希望对您有所帮助