1
我有一個其中包含gridview的頁面。
我的gridview顯示產品信息和管理員可以Edit gridviews columns。
我的兩個columns顯示brand name和category name每個產品;
我使用的ItemTemplate標籤標貼在我的網格視圖顯示這兩列的值，我用兩個dropdownlists（branddrop，categorydrop）
我EditItemTemplate標籤編輯這兩列的值，當管理員在branddrop的categorydrop選擇項目應顯示品牌名稱，這些名稱與品牌名稱中的選定品牌名稱相關。
在EditItemTemplate中使用父子關係的Dropdownlist Gridview不起作用
品牌名稱是：
三星，諾基亞，索尼愛立信，蘋果，LG，HTC ....
和我的類別名稱類別表有：
的Galaxy Nexus，銀河標籤2 7. 0，銀河S3，阿沙，的Lumia，的iPhone，iPad的Xperia弧，新的Xperia，X8的Xperia，餅乾3G，曲奇精簡版，Km555e，Optimus的L9，Optimus的精英，Optimus g，wt18i，w8,500，n 8 ...
當我點擊Edit button時，branddrop中的第一項等於可品牌化。
ItemTemplate中的文本，它工作正常我的問題是在類別下降的第一項不等於可分類。
文本在ItemTemplate中，並且類別下拉菜單不會將相關類別名稱顯示爲品牌名稱。
對於每款產品都顯示iphone和ipad，因此我必須在branddrop中選擇其他項目，然後再次選擇與該產品相關的相關品牌名稱，然後categorydrop可以顯示相關類別名稱的列表。
我試過用brandDrop_SelectedIndexChanged和GridView1_RowEditing但它不起作用。
我不知道如何解決它。
這是我的第一個代碼：
<asp:TemplateField HeaderText="brand name">
<ItemTemplate>
<asp:Label ID="brandname" runat="server" Text='<%#Eval("brand_name") %>'></asp:Label>
<asp:Label ID="idfrombrand" runat="server" Text='<%#Eval("idfrombrands") %>' Visible="false"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="br" runat="server" Text='<%# Eval("idfrombrands") %>' Visible="false"></asp:Label><%--OnSelectedIndexChanged="brandDrop_SelectedIndexChanged" --%>
<asp:DropDownList ID="brandDrop" runat="server" DataTextField="brand_name" DataValueField="id" DataSourceID="SqlDataSource4" AutoPostBack="true" OnSelectedIndexChanged="brandDrop_SelectedIndexChanged" >
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource4" runat="server" ConnectionString="<%$ ConnectionStrings:mobile_storeConnectionString2 %>" SelectCommand="select [id],[brand_name] from [brands]" ></asp:SqlDataSource>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="category name">
<ItemTemplate>
<asp:Label ID="catname" runat="server" Text='<%# Eval("category_name") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="OldCatName" runat="server" Text='<%# Eval("idfromCategories") %>' Visible="false"></asp:Label>
<asp:DropDownList ID="categoryDrop" runat="server" AutoPostBack="true" DataTextField="category_name" DataValueField="id" DataSourceID="SqlDataSource3"> <%-- --%>
</asp:DropDownList>
<asp:Label ID="cat" runat="server" Text='<%# Eval("idfromCategories") %>' Visible="false" ></asp:Label>
<asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:mobile_storeConnectionString2 %>" SelectCommand="select [category_name],[id],[idfrombrands] from [categories] where [email protected] " >
<SelectParameters>
<asp:ControlParameter ControlID="brandDrop"
Name="idfrombrands" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
</EditItemTemplate>
</asp:TemplateField>
這是我的代碼背後GridView1_RowDataBound和GridView1_RowUpdating：
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int brand=0;
int category=0;
//Drop Brand--------------------------------------
DropDownList list1 = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("brandDrop");
Label lbl = (Label)GridView1.Rows[e.RowIndex].FindControl("br");
if (list1.SelectedItem.Value != null)
{
brand = Convert.ToInt32(list1.SelectedItem.Value);//NewIdFromBrand
}
else
{
brand = Convert.ToInt32(lbl.Text);
}
//Drop Category----------------------------------------
DropDownList list2 = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("categoryDrop");
Label lbl2 = (Label)GridView1.Rows[e.RowIndex].FindControl("OldCatName");
//int NewIdFromBrand2 = -1;
if (list2.SelectedItem.Value != null)
{
category = Convert.ToInt32(list2.SelectedItem.Value);//NewIdFromBrand2
}
else
{
category = Convert.ToInt32(lbl2.Text);
}
//Photo-------------------------------------------
string photoname = System.Guid.NewGuid().ToString();
GridViewRow row = GridView1.Rows[e.RowIndex];
FileUpload fileUpload = row.FindControl("FileUploadimg") as FileUpload;
Label lbl3 = (Label)GridView1.Rows[e.RowIndex].FindControl("oldImage");
if (fileUpload != null && fileUpload.HasFile)
{
fileUpload.SaveAs(Server.MapPath("~/P_Image") + photoname + fileUpload.FileName);
SqlDataSource1.UpdateParameters["path"].DefaultValue = "~/P_Image" + photoname + fileUpload.FileName;
}
else
{
SqlDataSource1.UpdateParameters["path"].DefaultValue = lbl3.Text;//oldImage.Text;
}
int prid = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value);
SqlConnection cn = new SqlConnection();
cn.ConnectionString = "server = . ; database = mobile_store ; Trusted_Connection=true";
DataTable tb = new DataTable();
SqlCommand cmd = new SqlCommand();
cmd.Connection = cn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "UpdateProduct";
cmd.Parameters.AddWithValue("@brandid", brand);
cmd.Parameters.AddWithValue("@catid", category);
cmd.Parameters.AddWithValue("@pid", prid);
try
{
cn.Open();
cmd.ExecuteNonQuery();
SqlDataSource1.DataBind();
}
catch (Exception ex2)
{
}
finally { cn.Close(); }
//GridView1.EditIndex = -1;
//GridView1.DataBind();
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//check if is in edit mode
if ((e.Row.RowState & DataControlRowState.Edit) > 0)
{
DataRowView dRowView1 = (DataRowView)e.Row.DataItem;
if (e.Row.RowType == DataControlRowType.DataRow)
{
if ((e.Row.RowState & DataControlRowState.Edit) > 0)
{
DropDownList ddlStatus = (DropDownList)e.Row.FindControl("brandDrop");
ddlStatus.SelectedValue = dRowView1["brandId"].ToString();
DropDownList ddlStatus2 = (DropDownList)e.Row.FindControl("categoryDrop");
ddlStatus2.SelectedValue = dRowView1["categoryID"].ToString();
//Label1.Text = ddlStatus.SelectedValue;
}
}
}
}
}
可能重複http://stackoverflow.com/questions/8056408/asp-net-gridview-refresh-with-cascading-dropdown-controls –