我希望我提出的问题对我要解决的问题是正确的。我有一个GridView，它显示来自SQL源的数据。我需要将其中一列作为下拉列表。我也在寻找一种方法，当我打开下拉菜单时，它选择该行，然后执行添加的OnSelectedIndexChange事件。
我正在提取相应所选行的单元格数据，并将该数据提交到SQL表。有没有一种方法可以不选择该行，而将下拉列表的更改用作该行的标识符？我之所以这么问，是因为在选择该行时还有一个额外的回发。我正在寻找下拉菜单的能力，并在选择新值时执行更改事件（它将行数据提交到数据库。）
如果必须选择，则必须选择。但是我当前遇到的最大问题是选择的下拉列表值没有传递给C＃。这是Gridview和C＃，显示了我在做什么。我有很多评论，因为我看不到为什么它不会传递值。
<div class="CurrentMonthTab" style ="height:350px; width:90%; margin-left:15px; overflow-y: scroll; overflow-x: hidden">
<asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False"
Width="100%" Font-Size = "11pt"
CellPadding="5" ClientIDMode="Static" ShowHeader="False"
HeaderStyle-BackColor="YellowGreen" DataSourceID="SqlDataSource2">
<Columns>
<asp:CommandField ShowSelectButton="True" />
<asp:BoundField DataField="Client" HeaderText="Client" SortExpression="Client" ItemStyle-Width="16%" />
<asp:BoundField DataField="UniqClient" HeaderText="UniqClient" SortExpression="UniqClient" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol" />
<asp:BoundField DataField="Expiring_Policies" HeaderText="Expiring_Policies" ReadOnly="True" SortExpression="Expiring_Policies" ItemStyle-Width="18%" ItemStyle-Wrap="True" />
<asp:BoundField DataField="Premiums" HeaderText="Premiums" ReadOnly="True" SortExpression="Premiums" ItemStyle-Width="8%" ItemStyle-CssClass="ExpDateCSS" />
<asp:BoundField DataField="TotalPremium" HeaderText="TotalPremium" ReadOnly="True" SortExpression="TotalPremium" ItemStyle-Width="8%" />
<asp:BoundField DataField="Lines" HeaderText="Lines" SortExpression="Lines" ItemStyle-Width="20%" ReadOnly="True" />
<asp:BoundField DataField="ExpDate" HeaderText="ExpDate" ReadOnly="True" SortExpression="ExpDate" ItemStyle-Width="10%" />
<asp:BoundField DataField="Company" HeaderText="Company" SortExpression="Company" ItemStyle-Width="6%" ItemStyle-CssClass="ExpDateCSS" ReadOnly="True" />
<asp:BoundField DataField="Broker_Name" HeaderText="Broker_Name" SortExpression="Broker_Name" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol" />
<asp:TemplateField HeaderText="NameOf" SortExpression="NameOf">
<ItemTemplate>
<asp:DropDownList ID="ddlUnderWriter" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_OnSelectedIndexChanged" SelectedValue='<%# Bind("NameOf") %>' DataSourceID="SqlDataSource3" DataTextField="NameOf" DataValueField="NameOf">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="UniqBroker" HeaderText="UniqBroker" ReadOnly="True" SortExpression="UniqBroker" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol" />
</Columns>
<HeaderStyle BackColor="YellowGreen"></HeaderStyle>
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="Red" />
</asp:GridView>
这是GridView，下拉菜单中有一个模板字段。
protected void DropDownList1_OnSelectedIndexChanged(object sender, EventArgs e )
{
//TableCell client = GridView1.Rows[c.RowIndex].Cells[1];
// string Client = GridView1.SelectedRow.Cells[1].Text;//Client Name
//int UniqCNT = Int32.Parse(GridView1.SelectedRow.Cells[2].Text); //UniqClient
//string ExpPolicyNums = GridView1.SelectedRow.Cells[3].Text;
//int Ub = Int32.Parse(GridView1.SelectedRow.Cells[11].Text);//UniqBroker
//string ExperationDate = GridView1.SelectedRow.Cells[7].Text; //ExpDate
string NewUw = GridView1.SelectedRow.Cells[10].Text; //This inserts the Under Writer
/* string Company = GridView1.SelectedRow.Cells[8].Text; //Company issuer
string Broker = GridView1.SelectedRow.Cells[9].Text; //Broker_Name
string Premium = GridView1.SelectedRow.Cells[4].Text; //Premiums
string TotalPremium = GridView1.SelectedRow.Cells[5].Text; //Total premiums
string Reviewed = "No"; //Updates the DB and shows that it hasn't been reviewed by the Message Creator
//DateCreated gets inserted when record is created */
// string NewUw = ddlUnderWriter1.SelectedValue;
DateTime dateUpDated = DateTime.Now; //Inserts a dateUpdated record
if (String.IsNullOrEmpty(NewUw))
{
string empty = "empty fin box";
MessageBox.Show(empty);
}
else
{
MessageBox.Show(NewUw);
}
// int UpR = Int32.Parse(vRenewalReport.SelectedRow.Cells[9].Text); //UniqProducer. This will always submit NULL due to not
// intially receving the UniqProducer data in the GridView
/*
string query = "INSERT INTO [GTU_Apps].[dbo].[Reviewed_Renewal_Policy] (UniqClient, Client, [Expiring_Policies], Premiums, TotalPremium, UniqBroker, ExpDate, NewUw, Company, Broker_Name, Reviewed, DateUpdated) " +
"VALUES (@UniqCNT, @Client, @ExpPolicyNums, @Premium, @TotalPremium, @Ub, @ExperationDate, @NewUw, @Company, @Broker, @Reviewed, @dateUpDated)";
using (SqlConnection conn = new SqlConnection("Data Source=GTU-BDE01;Initial Catalog=GTU_Apps;Integrated Security=True"))
{
using (SqlCommand comm = new SqlCommand(query, conn))
{
comm.Parameters.AddWithValue("@UniqCNT", UniqCNT);
comm.Parameters.AddWithValue("@Client", Client);
comm.Parameters.AddWithValue("@ExpPolicyNums", ExpPolicyNums);
comm.Parameters.AddWithValue("@Premium", Premium);
comm.Parameters.AddWithValue("@TotalPremium", TotalPremium );
comm.Parameters.AddWithValue("@Ub", Ub);
comm.Parameters.AddWithValue("@ExperationDate", ExperationDate);
comm.Parameters.AddWithValue("@NewUw", NewUw);
comm.Parameters.AddWithValue("@Company", Company);
comm.Parameters.AddWithValue("@Broker", Broker);
comm.Parameters.AddWithValue("@Reviewed", Reviewed);
comm.Parameters.AddWithValue("@dateUpDated", dateUpDated);
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
}
}*/
End(sender, e);
}
这是背后的代码。其中大部分内容已被注释掉，因为我需要隔离下拉列表并弄清楚为什么它没有通过值。您可以看到我正在检查字符串是否为null或为空。然后使用消息框快速显示它以进行测试。即使我故意选择该行，然后更改下拉列表，它也会告诉我它是空的。任何帮助将不胜感激。