大家好，我有4个下拉列表，每个下拉列表都分配给各个SQL数据源，并放置在gridview内。如下所示。
<asp:GridView ID="SupplierView" runat="server" OnRowDataBound="SupplierView_OnRowDataBound" OnPageIndexChanging="SupplierView_PageIndexChanging1" OnSorting="SupplierView_Sorting1" AllowPaging="True" AutoGenerateColumns="False" CssClass="GridCenter" CellPadding="4" ForeColor="#333333" GridLines="None" HorizontalAlign="Center" OnRowUpdated="SupplierView_RowUpdated" OnRowUpdating="SupplierView_RowUpdating" ViewStateMode="Enabled" >
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:BoundField DataField="MaterialNumber" HeaderText="Material Number" SortExpression="MaterialNumber" />
<asp:BoundField DataField="MaterialDecsription" HeaderText="Material Description" SortExpression="MaterialDecsription" />
<asp:TemplateField HeaderText="CountryOfOrigin" SortExpression="CountryOfOrigin">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("CountryOfOrigin") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="CountryOfOriginDDL" runat="server" SelectedValue='<%# Bind("CountryOfOrigin") %>' DataSourceID="SqlDataSource2COO" DataTextField="CountryOfOrigin" DataValueField="CountryOfOrigin" OnSelectedIndexChanged="CountryOfOriginDDL_OnSelectedIndexChanged" >
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ECCN" SortExpression="ECCN">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("ECCN") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="ECCNDDL" runat="server" DataSourceID="SqlDataSourceECCN" DataTextField="ECCN" DataValueField="ECCN" OnSelectedIndexChanged="ECCNDDL_OnSelectedIndexChanged" ViewStateMode="Enabled" AutoPostBack="True">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ALCode" SortExpression="ALCode">
<EditItemTemplate>
<asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("ALCode") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="ALCODEDDL" runat="server" DataSourceID="SqlDataSourceALCODE" DataTextField="ALCode" DataValueField="ALCode" OnSelectedIndexChanged="ALCODEDDL_OnSelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Preference" SortExpression="Preference">
<EditItemTemplate>
<asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("Preference") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="PrefDDL" runat="server" DataSourceID="SqlDataSourcePREF" DataTextField="Preference" DataValueField="Preference" OnSelectedIndexChanged="PrefDDL_OnSelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
<p> <asp:Button ID="Updatebtn" runat="server" Text="Update" />-<asp:Button ID="Savebtn" runat="server" Text="Save" />-<asp:Button ID="BtnLogOut" runat="server" Text="Log Out" OnClick="BtnLogOut_OnClick" /> </p>
</div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SapMainServerDataPull %>" SelectCommand="SELECT [MaterialNumber], [MaterialDecsription], [CountryOfOrigin], [ECCN], [ALCode], [Preference] FROM [VendorDetailsRecordsForUpdate] WHERE ([VendorID] = @VendorID)">
<SelectParameters>
<asp:SessionParameter Name="VendorID" SessionField="VendorId" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource2COO" runat="server" ConnectionString="<%$ ConnectionStrings:SapMainServerDataPull %>" SelectCommand="SELECT DISTINCT [CountryOfOrigin] FROM [VendorDetailsRecordsForUpdate] ORDER BY [CountryOfOrigin]" UpdateCommand="uspSupplierUpdateECCN" UpdateCommandType="StoredProcedure">
<UpdateParameters>
<asp:Parameter Name="ECCN" Type="String"></asp:Parameter>
<asp:Parameter Name="VendorId" Type="String"></asp:Parameter>
</UpdateParameters>
</asp:SqlDataSource>
<asp:Label ID="ErrMsgUpdate" runat="server" Text=""></asp:Label>
<asp:SqlDataSource ID="SqlDataSourceECCN" runat="server" ConnectionString="<%$ ConnectionStrings:SapMainServerDataPull %>" SelectCommand="SELECT DISTINCT [ECCN] FROM [VendorDetailsRecordsForUpdate] ORDER BY [ECCN]" UpdateCommand="uspSupplierUpdateECCN" UpdateCommandType="StoredProcedure">
<UpdateParameters>
<asp:Parameter Name="ECCN" Type="String"></asp:Parameter>
</UpdateParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSourceALCODE" runat="server" ConnectionString="<%$ ConnectionStrings:SapMainServerDataPull %>" SelectCommand="SELECT DISTINCT [ALCode] FROM [VendorDetailsRecordsForUpdate] ORDER BY [ALCode]"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSourcePREF" runat="server" ConnectionString="<%$ ConnectionStrings:SapMainServerDataPull %>" SelectCommand="SELECT DISTINCT [Preference] FROM [VendorDetailsRecordsForUpdate] ORDER BY [Preference]"></asp:SqlDataSource>
我是编码新手（仍处于学习阶段）很抱歉，可能是一个简单的问题。
此刻，下拉列表显示了我需要的数据。但是在回发之后，它们都重置为原始值，我做了一些研究，我相信我需要在后面的代码中引用这些下拉列表。.我不想使用sql adapter等，因为sqldatasource似乎正在工作至少显示数据。
我还需要更新用户选择的值的应用程序，那么如何在选择后将我的下拉列表保存到数据库？
我还看到了一些有关在页面加载时在回发之外绑定gridview的信息。对不起，我怀疑这是标准内容，但是我仍然无法找到针对我特定问题的任何真正的解决方案。并使用列表添加值，但我不想这样做，因为值可能会随时间变化，因此从sqldatasource直接调用它们似乎是逻辑步骤。
到目前为止，这是我的代码。因此，这可能没有多大意义。
{
public partial class Update : System.Web.UI.Page
{
public string Eccn { get; set; }
public string CountryOfOrigin { get; set; }
public string AlCode { get; set; }
public string Pref { get; set; }
public string VendorId;
protected void Page_Load(object sender, EventArgs e)
{
if (Session["VendorId"] != null)
VendorId = Session["VendorId"].ToString();
RefreshGrid(VendorId);
if (Session["VendorId"] == null)
{
Response.Redirect("~/Login.aspx");
}
if (!IsPostBack)
{
BindGrid();
}
}
public void RefreshGrid(string vendorId)
{
try
{
//get list of records from vendorId
BizManager biz = new BizManager();
DataTable dt = new DataTable();
biz.GetMaterialAndDesc(VendorId);
SupplierView.DataSource = SqlDataSource1;
SupplierView.DataBind();
}
catch (Exception ex)
{
ErrMsg = App.App.HandleError(MethodBase.GetCurrentMethod(), ex,
"Application Failed adding products to the list");
}
}
private string ErrMsg
{
get { return ErrMsgUpdate.Text; }
set { ErrMsgUpdate.Text = value; }
}
private string ConvertSortDirectionToSql(SortDirection sortDirection)
{
string newSortDirection = String.Empty;
switch (sortDirection)
{
case SortDirection.Ascending:
newSortDirection = "ASC";
break;
case SortDirection.Descending:
newSortDirection = "DESC";
break;
}
return newSortDirection;
}
protected void SupplierView_PageIndexChanging1(object sender, GridViewPageEventArgs e)
{
SupplierView.PageIndex = e.NewPageIndex;
SupplierView.DataBind();
}
protected void SupplierView_Sorting1(object sender, GridViewSortEventArgs e)
{
DataTable dataTable = SupplierView.DataSource as DataTable;
if (dataTable != null)
{
DataView dataView = new DataView(dataTable);
dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);
SupplierView.DataSource = dataView;
SupplierView.DataBind();
}
}
private void RefreshData()
{
}
protected void SupplierView_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
}
protected void SupplierView_RowUpdated(object sender, GridViewUpdatedEventArgs e)
{
}
protected void BtnLogOut_OnClick(object sender, EventArgs e)
{
Response.Redirect("~/Logout.aspx");
}
protected void CountryOfOriginDDL_OnSelectedIndexChanged(object sender, EventArgs e)
{
throw new NotImplementedException();
}
protected void ECCNDDL_OnSelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl = sender as DropDownList;
foreach (GridViewRow row in SupplierView.Rows)
{
Control ctrl = row.FindControl("ECCNDDL") as DropDownList;
if (ctrl != null)
{
DropDownList ddl1 = (DropDownList) ctrl;
if (ddl.ClientID == ddl1.ClientID)
{
SqlDataSourceECCN.UpdateParameters["VendorId"].DefaultValue = "0000107898";
SqlDataSourceECCN.UpdateParameters["ECCN"].DefaultValue = ddl1.SelectedValue;
}
}
}
//Session["VendorId"] = VendorId;
//SqlDataSourceECCN.UpdateParameters["VendorId"].DefaultValue = Session.ToString();
//SqlDataSourceECCN.UpdateParameters["ECCN"].DefaultValue = Eccn;
}
protected void ALCODEDDL_OnSelectedIndexChanged(object sender, EventArgs e)
{
throw new NotImplementedException();
}
protected void PrefDDL_OnSelectedIndexChanged(object sender, EventArgs e)
{
throw new NotImplementedException();
}
protected void SupplierView_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
DropDownList dropDownLst = (DropDownList)e.Row.FindControl("ECCNDDL");
dropDownLst.DataSource = SqlDataSourceECCN;
dropDownLst.DataTextField = "ECCN";
dropDownLst.DataValueField = "ECCN";
dropDownLst.DataBind();
}
}
}
}
答案 0 :(得分：0)
在Webforms中，我发现轻松抽出一些DataTables来保存数据很容易。因此，我使用一种简单的方法从数据库获取数据并返回带有结果的DataTable。 该查询可以是选择查询或存储过程。
public static DataTable LoadDataFromDB(string query)
{
DataTable dt = new DataTable();
using (SqlConnection connection = new SqlConnection(ConnectionString))
using (SqlDataAdapter adapter = new SqlDataAdapter(query, connection))
{
try
{
adapter.Fill(dt);
}
catch
{
}
}
return dt;
}
现在，您可以在任何地方使用LoadDataFromDB来简单地用数据填充控件。
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack == false)
{
//as a query
DataTable dt = LoadDataFromDB("select top 10 * from mytable");
GridView1.DataSource = dt;
GridView1.DataBind();
//or stored procedure
DropDownList1.DataSource = LoadDataFromDB("mysp 1, 2");
DropDownList1.DataTextField = "columnA";
DropDownList1.DataValueField = "columnB";
DropDownList1.DataBind();
}
}
更新
它们在GridView中没关系。只需使用FindControl。
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = e.Row.FindControl("") as DropDownList;
ddl.DataSource = LoadDataFromDB("select a from b order by c");
ddl.DataTextField = "username";
ddl.DataValueField = "fullwidth";
ddl.DataBind();
}
}