[英]Cannot get textbox value from textbox in itemtemplate
文本框中的數量(dataWanted in DB)是通過Basket DB表中的Eval()方法加載的。 我想要實現的是,當我手動更改數量並單擊更新時,將更新該記錄的數量,然后重新加載網格。 我似乎無法在后面的代碼中檢索該文本框的值。
我知道FindControl()方法,它用於從itemtemplate中的控件獲取值,但我不知道如何在這里使用它。
嘗試下面但總是得到nullReferenceException
TextBox txt = (TextBox)GridView2.FindControl("txtQuantityWanted");
int _quantity = Convert.ToInt16(txt.Text);
注意:按鈕在那里,但什么也沒做。
<ItemTemplate>
<asp:TextBox runat="server" ID="txtQuantityWanted" Text='<%# Eval("quantityWanted") %>' ></asp:TextBox>
<asp:LinkButton ID="LinkButton11" runat="server" CommandName="update" CommandArgument='<%# Eval("coffeeName") + ";" + Eval("datetimeAdded") %>' >Update</asp:LinkButton>
<asp:Button ID="Button21" runat="server" Text="Button" CommandName="edit" />
</ItemTemplate>
<asp:TemplateField HeaderText="Total [£]">
<ItemTemplate>
<asp:Label id="lblItemTotal" runat="server" Text='<%# String.Format("{0:C}", Convert.ToInt32(Eval("quantityWanted"))* Convert.ToDouble(Eval("price"))) %>' ></asp:Label>
<asp:LinkButton ID="LinkButton1" runat="server" CommandName="remove" CommandArgument='<%# Eval("coffeeName") + ";" + Eval("datetimeAdded") %>' >Remove</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
C#代碼:
protected void GridView2_RowCommand(object sender, GridViewCommandEventArgs e)
{
// .....
else if (e.CommandName == "update")
{
string params = Convert.ToString(e.CommandArgument);
string[] arg = new string[2];
arg = params.Split(';');
name = Convert.ToString(arg[0]);
datetimeAdded = Convert.ToString(arg[1]);
const string strConn = @"Data Source=.\SQLEXPRESS;AttachDbFilename=L:\ASP.NET\Exercise1\Exercise1\Exercise1\App_Data\ASPNETDB.MDF;Integrated Security=True;Connect Timeout=30;User Instance=True";
DataSet ds = new DataSet("Employees");
SqlConnection connection = new SqlConnection(strConn);
// Here I need value from textbox to replace 11
SqlCommand abc = new SqlCommand("UPDATE Basket SET quantityWanted = 11 WHERE coffeeName LIKE '%" + name + "%' AND datetimeAdded LIKE '" + datetimeAdded + "' ", connection);
connection.Open();
int ii = abc.ExecuteNonQuery();
connection.Close();
}
}
使用GridView.Rows集合來查找控件。 您可以傳遞行集合索引器中的行索引。
TextBox txt = (TextBox)GridView2.Rows[0].FindControl("txtQuantityWanted");
您也必須傳遞行索引,您的代碼將如下所示
TextBox txt = (TextBox)GridView2.Rows[0].FindControl("txtQuantityWanted");
我希望它對你有用。
Control ctrl = e.CommandSource as Control;
if (ctrl != null)
{
GridViewRow gvRow = ctrl.Parent.NamingContainer as GridViewRow;
TextBox txt= (TextBox)gvRow.FindControl("txtQuantityWanted");
}
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