Datagrid с колонками DropDownList в режиме редактирования

У меня есть редактируемый DataGrid с EditCommandColumn. Первоначально DataGrid показывает правильные значения, вытащенные из базы данных. Проблема в том, что когда строка переходит в режим редактирования, столбцы с DropDownLists показывают первое значение в списке, а не правильное значение. Что может вызвать это и как его исправить?Datagrid с колонками DropDownList в режиме редактирования

вот .aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Kunde_drop.aspx.cs"Inherits ="Kunde_drop._Default" %> 
<html> 
<head id="Head1" runat="server"> 
<title></title> 

</head> 
<body> 

<form id="Form1" runat="server"> 
<table id="Table1" style="height:176;width:344" cellspacing="1" cellpadding="1" border="0"> 
...... 
...... 
...... 
<asp:DataGrid id="DataGrid1" Runat="server" DataKeyField="kundennr" 
AutoGenerateColumns="False" EditItemStyle-BackColor="#F7F7F7" 
HeaderStyle-BackColor="#F7F7F7" CellPadding="4" HorizontalAlign="Left"> 
<FooterStyle BackColor="PaleGoldenrod"></FooterStyle> 
<SelectedItemStyle BackColor="Control"></SelectedItemStyle> 
<EditItemStyle BackColor="#F7F7F7"></EditItemStyle> 
<ItemStyle BackColor="White"></ItemStyle> 
<HeaderStyle BackColor="DarkKhaki"></HeaderStyle> 
<Columns> 
<asp:TemplateColumn HeaderText="Kundennr"> 
<HeaderStyle Width="30px"></HeaderStyle> 
<ItemTemplate> 
<asp:Literal ID="Label" Text='<%# DataBinder.Eval(Container.DataItem, "kundennr")%>' Runat="server" /> 
</ItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Kundetyp"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<asp:Label ID="lblKtyp" Text='<%# DataBinder.Eval(Container.DataItem, "kundentyp")%>' runat="server"></asp:Label> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:dropdownlist ID="Dropdownlist1" DataSource='<%# LoadKundentype() %>' 
DataTextField="kundertype" runat="server"></asp:dropdownlist> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Firma"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "firma") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox2" Text='<%# DataBinder.Eval(Container.DataItem, "firma") %>'Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Anrede"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "anrede") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:dropdownlist ID="Dropdownlist2" DataSource='<%# LoadAnrede() %>' 
DataTextField="anrede" runat="server"></asp:dropdownlist> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Name"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "name1") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox16" Text='<%# DataBinder.Eval(Container.DataItem, "name1") %>'Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Ansprechperson"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "ansprechperson") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox17" Text='<%# ataBinder.Eval(Container.DataItem,"ansprechperson") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Strasse"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "strasse") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox18" Text='<%# DataBinder.Eval(Container.DataItem, "strasse") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Ort"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "ort") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox19" Text='<%# DataBinder.Eval(Container.DataItem, "ort") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="PLZ"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "plz") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:Textbox ID="Textbox20" Text='<%# DataBinder.Eval(Container.DataItem, "plz") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Email"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "email") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox21" Text='<%# DataBinder.Eval(Container.DataItem, "email") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Telefon 1"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "telefon1") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox22" Text='<%# DataBinder.Eval(Container.DataItem, "telefon1") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Telefon 2" ItemStyle-Wrap="False"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "telefon2") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox23" Text='<%# DataBinder.Eval(Container.DataItem, "telefon2") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:TemplateColumn HeaderText="Region"> 
<HeaderStyle Width="100px"></HeaderStyle> 
<ItemTemplate> 
<%# DataBinder.Eval(Container.DataItem, "region") %> 
</ItemTemplate> 
<EditItemTemplate> 
<asp:TextBox ID="Textbox24" Text='<%# DataBinder.Eval(Container.DataItem, "region") %>' Runat="server" /> 
</EditItemTemplate> 
</asp:TemplateColumn> 
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit"></asp:EditCommandColumn> 
<asp:ButtonColumn Text="Delete" CommandName="Delete"></asp:ButtonColumn> 
</Columns> 
</asp:DataGrid></td> 
</tr> 
</table> 
</form> 
</body> 
</html>

Существует в .aspx.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Collections; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Web.SessionState; 
using System.Web.UI.HtmlControls; 
using MySql.Data; 
using MySql.Data.MySqlClient; 
using MySql.Data.Types; 

namespace Kunde_drop 
{ 
public partial class _Default : System.Web.UI.Page  
{ 
private const string ConnStr = "SERVER=serv;DATABASE=dbk;UID=user;PASSWORD=pas;"; 
string strSort; 
string strerrorMsg; 
string strscriptString; 

protected void Page_Load(object sender, EventArgs e) 
{ 
if (!IsPostBack) 
{ 
if (strSort == "") 
{ 
strSort = "IntegerValue"; 
} 

BindDataGrid(); 
} 
} 

public ICollection LoadKundentype() 
{ 
MySqlConnection con1 = new MySqlConnection(ConnStr); 
con1.Open(); 
string cmd1 = "SELECT * FROM kunderetyp WHERE 1"; 
MySqlDataAdapter da = new MySqlDataAdapter(cmd1, con1); 
DataSet ds = new DataSet(); 
da.Fill(ds, "kundertype"); 
DataTable dt = ds.Tables["kundertype"]; 
return dt.DefaultView; 
} 

public ICollection LoadAnrede() 
{ 
MySqlConnection con2 = new MySqlConnection(ConnStr); 
con2.Open(); 
string cmd2 = "SELECT * FROM anrede WHERE 1"; 
MySqlDataAdapter da = new MySqlDataAdapter(cmd2, con2); 
DataSet ds = new DataSet(); 
da.Fill(ds, "anrede"); 
DataTable dt = ds.Tables["anrede"]; 
return dt.DefaultView; 
} 

private void BindDataGrid() 
{ 
using (MySqlConnection con = new MySqlConnection(ConnStr)) 
using (MySqlCommand cmd = new MySqlCommand("SELECT * FROM kunde", con)) 
{ 
con.Open(); 
DataGrid1.DataSource = cmd.ExecuteReader(
CommandBehavior.CloseConnection | 
CommandBehavior.SingleResult); 
DataGrid1.DataBind(); 
} 
} 

private void UpdateInfo(int kundennr, string kundentyp, string firma, string anrede, string name1, string ansprechperson, string strasse, string ort, int plz, string email, string telefon1, string telefon2, string region) 
{ 
using (MySqlConnection con = new MySqlConnection(ConnStr)) 
using (MySqlCommand cmd = new MySqlCommand("UPDATE kunde SET kundentyp = @kundentyp, firma = @firma, anrede = @anrede, name1 = @name1, ansprechperson = @ansprechperson, strasse = @strasse, ort = @ort, plz = @plz, email = @email, telefon1 = @telefon1, telefon2 = @telefon2, region = @region WHERE kundennr = @kundennr", con)) 
{ 
cmd.Parameters.Add("@kundentyp", MySqlDbType.VarChar, 255).Value = kundentyp; 
cmd.Parameters.Add("@firma", MySqlDbType.VarChar, 255).Value = firma; 
cmd.Parameters.Add("@anrede", MySqlDbType.VarChar, 255).Value = anrede; 
cmd.Parameters.Add("@name1", MySqlDbType.VarChar, 255).Value = name1; 
cmd.Parameters.Add("@ansprechperson", MySqlDbType.VarChar, 255).Value = ansprechperson; 
cmd.Parameters.Add("@strasse", MySqlDbType.VarChar, 255).Value = strasse; 
cmd.Parameters.Add("@ort", MySqlDbType.VarChar, 255).Value = ort; 
cmd.Parameters.Add("@plz", MySqlDbType.Int32).Value = plz; 
cmd.Parameters.Add("@email", MySqlDbType.VarChar, 255).Value = email; 
cmd.Parameters.Add("@telefon1", MySqlDbType.VarChar, 20).Value = telefon1; 
cmd.Parameters.Add("@telefon2", MySqlDbType.VarChar, 45).Value = telefon2; 
cmd.Parameters.Add("@region", MySqlDbType.VarChar, 255).Value = region; 
cmd.Parameters.Add("@kundennr", MySqlDbType.Int64).Value = kundennr; 
con.Open(); 
cmd.ExecuteNonQuery(); 
} 
} 

private void DeleteInfo(int kundennr) 
{ 
using (MySqlConnection con = new MySqlConnection(ConnStr)) 
using (MySqlCommand cmd = new MySqlCommand("DELETE FROM kunde WHERE kundennr = @kundennr", con)) 
{ 
cmd.Parameters.Add("@kundennr", MySqlDbType.Int64).Value = kundennr; 
con.Open(); 
cmd.ExecuteNonQuery(); 
} 
} 


#region Web Form Designer generated code 
override protected void OnInit(EventArgs e) 
{ 
// 
// CODEGEN: This call is required by the ASP.NET Web Form Designer. 
// 
InitializeComponent(); 
base.OnInit(e); 
} 

/// <summary> 
/// Required method for Designer support - do not modify 
/// the contents of this method with the code editor. 
/// </summary> 
private void InitializeComponent() 
{ 
this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelCommand); 
this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand); 
this.DataGrid1.SortCommand += new System.Web.UI.WebControls.DataGridSortCommandEventHandler(this.DataGrid1_SortCommand); 
this.DataGrid1.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_UpdateCommand); 
this.DataGrid1.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_DeleteCommand); 
this.Load += new System.EventHandler(this.Page_Load); 
} 
#endregion 

private void DataGrid1_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e) 
{ 
} 

private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e) 
{ 
DataGrid1.EditItemIndex = (int)e.Item.ItemIndex; 
BindDataGrid(); 
} 


protected void DataGrid_RowEditing(object sender, GridViewEditEventArgs e) 
{ 
DataGrid1.EditItemIndex = e.NewEditIndex; 
BindDataGrid(); 
} 

private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e) 
{ 
try 
{ 
int cUsrID; 
string strKundentyp; 
string strFirma; 
string strAnrede; 
string strName1; 
string strAnsprechperson; 
string strStrasse; 
string strOrt; 
string strEmail; 
string strPlz; 
int intPlz; 
string strTelefon1; 
string strTelefon2; 
string strRegion; 
Literal ltID; 
TextBox txtTempFirma; 
DropDownList drdTempAnrede; 
TextBox txtTempName1; 
TextBox txtTempAnsprechperson; 
TextBox txtTempStrasse; 
TextBox txtTempOrt; 
TextBox txtTempPlz; 
TextBox txtTempEmail; 
TextBox txtTempTelefon1; 
TextBox txtTempTelefon2; 
TextBox txtTempRegion; 
DropDownList drdList; 

drdList = (System.Web.UI.WebControls.DropDownList)e.Item.Cells[1].FindControl("Dropdownlist1"); 
strKundentyp = drdList.Text; 
ltID = (System.Web.UI.WebControls.Literal)e.Item.Cells[0].FindControl("Label"); 
cUsrID = Convert.ToInt32(ltID.Text); 
txtTempFirma = (System.Web.UI.WebControls.TextBox)e.Item.Cells[2].FindControl("Textbox2"); 
strFirma = txtTempFirma.Text; 
drdTempAnrede = (System.Web.UI.WebControls.DropDownList)e.Item.Cells[3].FindControl("Dropdownlist2"); 
strAnrede = drdTempAnrede.Text; 
txtTempName1 = (System.Web.UI.WebControls.TextBox)e.Item.Cells[4].FindControl("Textbox16"); 
strName1 = txtTempName1.Text; 
txtTempAnsprechperson = (System.Web.UI.WebControls.TextBox)e.Item.Cells[5].FindControl("Textbox17"); 
strAnsprechperson = txtTempAnsprechperson.Text; 
txtTempStrasse = System.Web.UI.WebControls.TextBox)e.Item.Cells[6].FindControl("Textbox18"); 
strStrasse = txtTempStrasse.Text; 
txtTempOrt = (System.Web.UI.WebControls.TextBox)e.Item.Cells[7].FindControl("Textbox19"); 
strOrt = txtTempOrt.Text; 
txtTempPlz = (System.Web.UI.WebControls.TextBox)e.Item.Cells[8].FindControl("TextBox20"); 
strPlz = txtTempPlz.Text; 
intPlz = Convert.ToInt32(strPlz); 
txtTempEmail = (System.Web.UI.WebControls.TextBox)e.Item.Cells[9].FindControl("Textbox21"); 
strEmail = txtTempEmail.Text; 
txtTempTelefon1 = (System.Web.UI.WebControls.TextBox)e.Item.Cells[10].FindControl("Textbox22"); 
strTelefon1 = txtTempTelefon1.Text; 
txtTempTelefon2 = (System.Web.UI.WebControls.TextBox)e.Item.Cells[11].FindControl("Textbox23"); 
strTelefon2 = txtTempTelefon2.Text; 
txtTempRegion = (System.Web.UI.WebControls.TextBox)e.Item.Cells[12].FindControl("Textbox24"); 
strRegion = txtTempRegion.Text; 
UpdateInfo(cUsrID, strKundentyp, strFirma, strAnrede, strName1, strAnsprechperson, strStrasse, strOrt, intPlz, strEmail, strTelefon1, strTelefon2, strRegion); 
DataGrid1.EditItemIndex = -1; 
BindDataGrid(); 
} 
catch (Exception ex) 
{ 
strerrorMsg = ex.Message.Replace("'", @""""); 
strscriptString = "<script language = Javascript>"; 
strscriptString += "window.status = '" + strerrorMsg + "';"; 
strscriptString += "</script>"; 
RegisterStartupScript("clientScript", strscriptString); 
} 
} 

private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e) 
{ 
try 
{ 
int cID; 
Literal ltID = null; 
string ss = string.Empty; 
ltID = (System.Web.UI.WebControls.Literal)e.Item.Cells[0].FindControl("Label"); 
cID = Convert.ToInt32(ltID.Text); 
DeleteInfo(cID); 
BindDataGrid(); 
} 
catch (Exception ex) 
{ 
strerrorMsg = ex.Message.Replace("'", @""""); 
strscriptString = "<script language = Javascript>"; 
strscriptString += "window.status = '" + strerrorMsg + "';"; 
strscriptString += "</script>"; 
RegisterStartupScript("clientScript", strscriptString); 
} 
} 

private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e) 
{ 
DataGrid1.EditItemIndex = -1; 
BindDataGrid(); 
} 
} 
}

источник

2012-02-29 steve

Не могли бы вы предоставить код aspx части GridView? Вам нужно управлять в событии GridView RowData Bound, чтобы установить правильный раскрывающийся список значений. –

Во-первых, добавить DataValueField своим DropDownLists:

<asp:dropdownlist 
    ID="Dropdownlist1" 
    DataValueField="kundertype" 
    ... 

<asp:dropdownlist 
    ID="Dropdownlist2" 
    DataValueField="anrede" 
    ...

Во-вторых, добавить onitemdatabound события в ваш DataGrid:

<asp:DataGrid 
    onitemdatabound="DataGrid1_ItemDataBound" 
    ...

В-третьих, добавьте этот метод для обработки события ItemDataBound:

protected void DataGrid1_ItemDataBound(object sender, DataGridItemEventArgs e) 
{ 
    if (e.Item.ItemType == ListItemType.EditItem) 
    { 
     DropDownList dropDownList1 = (DropDownList)e.Item.FindControl("Dropdownlist1"); 
     DataRowView dataItem1 = (DataRowView)e.Item.DataItem; 
     dropDownList1.SelectedValue = (string)dataItem1.Row["kundertype"]; 

     DropDownList dropDownList2 = (DropDownList)e.Item.FindControl("Dropdownlist2"); 
     DataRowView dataItem2 = (DataRowView)e.Item.DataItem; 
     dropDownList2.SelectedValue = (string)dataItem2.Row["anrede"]; 
    } 
}

отметить также, что управление DataGrid было наследовал GridView. Возможно, вам не стоит этого менять, но вы можете проверить сравнение here.

источник

2012-03-01 16:27:30 kevev22

Datagrid с колонками DropDownList в режиме редактирования

ответ

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