所以我在gridview中有一个下拉列表，我试图从中获取selectvalues来更新我的数据库。我的问题是：当按下更新按钮时，它会忽略为所选值选择的内容，并获取首次加载下拉列表时第一个值设置的内容。
所以我的问题是：如何在gridview的更新事件期间从下拉列表中获取所选值。
下面你会看到我的代码隐藏，以及gridview的标记。
代码隐藏：
/// <summary>
/// Handles the Click event of the update button under edit in the gridview control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Web.UI.WebControls.GridViewUpdateEventArgs"/> instance containing the event data.</param>
protected void GridViewHolder_Updating(object sender, GridViewUpdateEventArgs e)
{
int machineid;
string machineid1;
string machineTypeid;
string machineModelid;
//retrieve and set the data
GridViewHolder.EditIndex = e.RowIndex;
BindData();
GridViewRow row = (GridViewRow)GridViewHolder.Rows[e.RowIndex];
TextBox mID = row.FindControl("MachineIDText") as TextBox;
DropDownList mType = row.FindControl("MachineTypeDropDown") as DropDownList;
DropDownList mModel = row.FindControl("MachineModelDropDown") as DropDownList;
machineid1 = mID.Text;
machineid = Convert.ToInt32(machineid1);
machineTypeid = mType.SelectedValue;
machineModelid = mModel.SelectedValue;
try
{
if (machineTypeid != "empty" || machineModelid != "empty")
{
if (machineTypeid != "empty")
{
inputsService.UpdateMachineTypes(machineid, machineTypeid);
}
if (machineModelid != "empty")
{
inputsService.UpdateMachineModels(machineid, machineModelid);
}
UpdateSucceed.Visible = true;
logger.Debug("Updating - Database successfully updated!");
}
else
{
UpdateFail.Visible = true;
logger.Debug("Updating - Database had no data selected to be updated.");
}
}
catch (Exception ex)
{
logger.ErrorFormat("Updating - Failed to update the table, ex = {0}", ex);
}
}
/// <summary>
/// Handles the Click event of the cancel button under edit in the gridview control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Web.UI.WebControls.GridViewCancelEditEventArgs"/> instance containing the event data.</param>
protected void GridViewHolder_Canceling(object sender, GridViewCancelEditEventArgs e)
{
//reset the edit index
GridViewHolder.EditIndex = -1;
//Bind data to GridViewHolder
BindData();
}
protected void GridViewHolder_DataBound(object sender, GridViewRowEventArgs e)
{
if (this.GridViewHolder.EditIndex != -1)
{
DropDownList mType = e.Row.FindControl("MachineTypeDropDown") as DropDownList;
DropDownList mModel = e.Row.FindControl("MachineModelDropDown") as DropDownList;
}
}
protected void GridViewHolder_Editing(object sender, GridViewEditEventArgs e)
{
//set the edit index to a new value
GridViewHolder.EditIndex = e.NewEditIndex;
//Bind data to gridviewholder
BindData();
}
#endregion
#region Private Methods
private void BindData()
{
GridViewHolder.DataSource = Session["MachineTable"];
GridViewHolder.DataBind();
}
gridview标记：
<asp:GridView ID="GridViewHolder"
runat="server"
AllowPaging="True"
AutoGenerateColumns="False"
BackColor="Transparent"
BorderColor="#999999"
BorderStyle="Ridge"
BorderWidth="3px"
CellPadding="4"
CellSpacing="2"
DataSourceID="MachineDataSet"
ForeColor="Black"
HeaderStyle-HorizontalAlign="Center"
HorizontalAlign="Center"
RowStyle-HorizontalAlign="Center"
Width="796px"
OnRowUpdating="GridViewHolder_Updating"
OnRowCancelingEdit="GridViewHolder_Canceling"
OnRowEditing="GridViewHolder_Editing"
OnRowDataBound="GridViewHolder_DataBound"
EnableViewState="False">
<RowStyle BackColor="Transparent"
HorizontalAlign="Center" />
<Columns>
<asp:TemplateField HeaderText="ID"
SortExpression="ID"
Visible="False">
<ItemTemplate>
<asp:Label ID="MachineIDLabel"
runat="server"
Text='<%# Bind("ID") %>'
Visible="false"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="MachineIDText" runat="server" Text='<%# Bind("ID") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="SiteName"
HeaderText="Site Name"
SortExpression="SiteName"
ReadOnly="true" />
<asp:BoundField DataField="Name"
HeaderText="Machine Name"
ReadOnly="true"
SortExpression="Name" />
<asp:TemplateField HeaderText="Machine Type"
SortExpression="MachineType">
<ItemTemplate>
<asp:Label ID="MachineTypeLabel"
runat="server"
Text='<%# Bind("MachineType") %>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="MachineTypeDropDown"
runat="server"
AppendDataBoundItems="True"
Height="21px"
Width="217px"
DataSourceID="GetMachineType"
DataTextField="Name"
DataValueField="ID">
<asp:ListItem Enabled="true"
Text="Select a Machine Type."
Value="empty">
</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Machine Model" SortExpression="MachineModel">
<ItemTemplate>
<asp:Label ID="MachineModelLabel"
runat="server"
Text='<%# Bind("MachineModel") %>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="MachineModelDropDown"
runat="server"
AppendDataBoundItems="True"
Height="21px" Width="217px"
DataSourceID="GetMachineModel"
DataTextField="Name"
DataValueField="ID">
<asp:ListItem Enabled="true"
Text="Select a Machine Model."
Value="empty">
</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:CommandField ButtonType="Button"
ShowEditButton="True"
CausesValidation="false" >
<ItemStyle HorizontalAlign="Center"
Wrap="True" />
</asp:CommandField>
</Columns>
<FooterStyle BackColor="Transparent" />
<PagerStyle BackColor="Transparent"
ForeColor="Black"
HorizontalAlign="Left" />
<SelectedRowStyle BackColor="Transparent"
Font-Bold="True"
ForeColor="White" />
<HeaderStyle BackColor="Black"
Font-Bold="True"
ForeColor="White"
HorizontalAlign="Center" />
</asp:GridView>
非常感谢任何帮助或建议，
谢谢
答案 0 :(得分：4)
RowUpdating event的事件参数类型为GridViewUpdateEventArgs。这包含关键字，旧值和新值的字典。没有必要通过在GridViewRow上使用FindControl来获取它们。
但是你获得旧值的主要原因是你在这个事件中再次使用DataBinding它。然后，您将使用DataSource中的值覆盖所有更改。
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridviewupdateeventargs.aspx
更新：似乎DropDownList的{{1}}不属于SelectedValue字典。因此，您可以在NewValues事件中添加它。
RowUpdating