我已经创建了这个gridview。这是我的代码
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Find the DropDownList in the Row
DropDownList dropdownnop = (e.Row.FindControl("dropdownnop") as DropDownList);
dropdownnop.DataSource = obj6.Fetchdata("SELECT * from Compliance_Tracker.dbo.paymentNatureMaster where STATUS='1';");
dropdownnop.DataTextField = "DESC";
dropdownnop.DataValueField = "DESC";
dropdownnop.DataBind();
// Select the payment nature in DropDownList
string nop = (e.Row.FindControl("NOP") as Label).Text;
dropdownnop.Items.FindByValue(nop).Selected = true;
}
这是我的html gridview代码
<asp:GridView ID="GridView1" runat="server" BackColor="White" BorderColor="Black" BorderStyle="Solid" Font-Bold="True" Font-Italic="False" Font-Size="Small" Height="72px" style="margin-left: 41px; margin-top: 108px" Width="783px" DataKeyNames="ID" OnRowEditing="GridView1_RowEditing" OnRowDeleting="GridView1_RowDeleting" OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" AutoGenerateColumns="False" AllowPaging="True" OnPageIndexChanging="GridView1_PageIndexChanging" OnRowDataBound="OnRowDataBound">
<AlternatingRowStyle BackColor="#FFFFCC" BorderColor="#FF9900" Wrap="False" />
<Columns>
<asp:TemplateField HeaderText="TASK ID" SortExpression="TASK ID" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label ID="TASKID" runat="server" Text='<%#Eval("[TASK ID]") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="NATURE OF PAYMENT" SortExpression="NATURE OF PAYMENT" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label ID="NOP" runat="server" Text='<%#Eval("[NATURE OF PAYMENT]") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="dropdownnop"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="DESC" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="DESC" Text='<%#Eval("[DESC]") %>'/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID ="DESC" runat="server" Text='<%#Eval("[DESC]") %>'></asp:TextBox>
<asp:RequiredFieldValidator ID="REQUIREDFIELDVALIDATORDESC" runat="server" ControlToValidate="DESC" ErrorMessage="FIELD CANNOT BE EMPTY"></asp:RequiredFieldValidator>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="FREQUENCY" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="FREQUENCY" Text='<%#Eval("FREQUENCY") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="dropdownfreq"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="DUE DATE OF PAYMENT" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="DDOP" Text='<%#Eval("PREALERT1") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="dropdownddop"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="DUE DATE OF SUBMISSION OF RETURN" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="DDOSOR" Text='<%#Eval("PREALERT2") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="dropdownddosor"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="OWNER" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="OWNER" Text='<%#Eval("OWNER") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="dropdownowner"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="VERIFICATION OWNER" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="VO" Text='<%#Eval("[VERIFICATION OWNER]") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="dropdownvo"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="STATUS" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label runat="server" ID="STATUS" Text='<%#Eval("STATUS") %>'/>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat ="server" ID="dropdownstatus">
<asp:ListItem Text="Active" Value="1"></asp:ListItem>
<asp:ListItem Text="Inactive" Value="0"></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField Visible="false" HeaderText="ID">
<ItemTemplate>
<asp:Label runat="server" ID="ID" Text='<%#Eval("ID") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Action" HeaderStyle-BackColor="DarkGreen" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:LinkButton ID="btnEdit" Text="Edit" runat="server" CommandName="Edit" />
<asp:LinkButton ID="btnDelete" Text="Delete" runat="server" CommandName="Delete" />
</ItemTemplate>
<EditItemTemplate>
<asp:LinkButton ID="btnUpdate" Text="Update" runat="server" CommandName="Update" />
<asp:LinkButton ID="btnCancel" Text="Cancel" runat="server" CommandName="Cancel" />
</EditItemTemplate>
</asp:TemplateField>
</Columns>
<PagerSettings FirstPageText="First" LastPageText="Last" Mode="NumericFirstLast" PageButtonCount="4" />
</asp:GridView>
所以，我的问题是我能够编辑使用编辑事件，但我无法 填充gridview中的下拉列表，而Iam能够在GridView外部执行相同操作。 这是我的完整代码隐藏
{
Comp obj6 = new Comp();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//populate gridview
TextBox2.Focus();
string selectquery = "select [TASK ID],[NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],(case when STATUS='1' then 'Active' when STATUS='0' then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.tasklistManager;";
obj6.PopulateGrid(GridView1, selectquery);
{
// populate dropdownlist for prealert 1
for (int i = 0; i <= 30; i++)
{
DropDownList3.Items.Insert(i, new ListItem((i + 1).ToString(), (i + 1).ToString()));
}
DropDownList3.DataBind();
}
{
// populate dropdown list for prealert 2
for (int j = 0; j <= 30; j++)
{
DropDownList4.Items.Insert(j, new ListItem((j + 1).ToString(), (j + 1).ToString()));
}
DropDownList4.DataBind();
}
{
//populate dropdown for Nature of Payment
string query = "select * from Compliance_Tracker.dbo.paymentNatureMaster where STATUS='1';";
string columnname = "DESC";
string datavaluefield = "DESC";
obj6.PopulateCombo(DropDownList1, query, columnname, datavaluefield);
}
{
//populate dropdown for frequency
string query1 = "select * from Compliance_Tracker.dbo.frequencyMaster where STATUS='1';";
string columnname1 = "DESC";
string datavaluefield1 = "DESC";
obj6.PopulateCombo(DropDownList2, query1, columnname1, datavaluefield1);
}
{
//populate dropdown for owner
string query2 = "select * from Compliance_Tracker.dbo.ownerMaster where STATUS='1';";
string columnname2 = "NAME";
string datavaluefield2 = "NAME";
obj6.PopulateCombo(DropDownList5, query2, columnname2, datavaluefield2);
}
{
//populate dropdown for owner verification
string query3 = "select * from Compliance_Tracker.dbo.verificationMaster where STATUS='1'";
string columnname3 = "NAME";
string datavaluefield3 = "NAME";
obj6.PopulateCombo(DropDownList6, query3, columnname3, datavaluefield3);
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string query = "insert into Compliance_Tracker.dbo.tasklistManager([NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],STATUS)values('" + DropDownList1.SelectedItem.Text + "','" + TextBox2.Text + "','" + DropDownList2.SelectedItem.Text + "','" + DropDownList3.SelectedItem.Text + "','" + DropDownList4.SelectedItem.Text + "','" + DropDownList5.SelectedItem.Text + "','" + DropDownList6.SelectedItem.Text + "','" + DropDownList7.SelectedValue + "');";
obj6.ExecuteScalar(query);
string selectquery = "select [TASK ID],[NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],(case when STATUS='1' then 'Active' when STATUS='0' then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.tasklistManager;";
obj6.PopulateGrid(GridView1, selectquery);
TextBox2.Text = string.Empty;
DropDownList7.SelectedItem.Text = "Active";
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
string selectquery = "select [TASK ID],[NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],(case when STATUS='1' then 'Active' when STATUS='0' then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.tasklistManager;";
obj6.bind(GridView1, selectquery, "Compliance_Tracker.dbo.tasklistManager");
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
string ID = GridView1.DataKeys[e.RowIndex].Value.ToString();
string query = "delete Compliance_Tracker.dbo.tasklistManager where Compliance_Tracker.dbo.tasklistManager.ID = " + ID;
string populatequery = query + ";select [TASK ID],[NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],(case when STATUS='1' then 'Active' when STATUS='0' then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.tasklistManager;";
obj6.BindGridData(populatequery, GridView1);
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
string selectquery = "select [TASK ID],[NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],(case when STATUS='1' then 'Active' when STATUS='0' then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.tasklistManager;";
obj6.bind(GridView1, selectquery, "Compliance_Tracker.dbo.tasklistManager");
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
string selectquery = "select [TASK ID],[NATURE OF PAYMENT],[DESC],FREQUENCY,PREALERT1,PREALERT2,OWNER,[VERIFICATION OWNER],(case when STATUS='1' then 'Active' when STATUS='0' then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.tasklistManager;";
obj6.bind(GridView1, selectquery, "Compliance_Tracker.dbo.tasklistManager");
}
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Find the DropDownList in the Row
DropDownList dropdownnop = (e.Row.FindControl("dropdownnop") as DropDownList);
dropdownnop.DataSource = obj6.Fetchdata("SELECT * from Compliance_Tracker.dbo.paymentNatureMaster where STATUS='1';");
dropdownnop.DataTextField = "DESC";
dropdownnop.DataValueField = "DESC";
dropdownnop.DataBind();
// Select the payment nature in DropDownList
string nop = (e.Row.FindControl("NOP") as Label).Text;
dropdownnop.Items.FindByValue(nop).Selected = true;
}
}
这里是fetchdata代码
public DataTable Fetchdata(string strSQL)
{
SqlDataAdapter DAdpt = new SqlDataAdapter();
DataSet DSet = new DataSet();
try
{
if (Conn.State == ConnectionState.Closed)
Conn.Open();
DAdpt = new SqlDataAdapter(strSQL, Conn);
DAdpt.Fill(DSet);
return DSet.Tables[0];
}
catch (Exception Ex)
{
return null;
throw new Exception(Ex.Message);
}
finally
{
DAdpt.Dispose();
DSet.Dispose();
Conn.Close();
}
}
答案 0 :(得分：2)
查找控制代码必定存在问题。在下面给出的代码中尝试我使用的那个：
protected void GrdPDataEdit_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Replace your find corntrol code with this
DropDownList drpnop = (DropDownList)e.Row.FindControl("dropdownnop");
if (drpnop != null)
{
drpnop.DataSource = obj6.Fetchdata("SELECT * from Compliance_Tracker.dbo.paymentNatureMaster where STATUS='1';");
drpnop.DataTextField = "DESC";
drpnop.DataValueField = "DESC";
drpnop.DataBind();
}
}
}
答案 1 :(得分：0)
生成gridview时，无法直接访问GridView内的DropDownList。您需要做的是使用GridView OnRowCreated事件并以这种方式填充下拉列表。我没有任何示例代码，但互联网上有大量的参考资料。
您的大多数代码都可以使用，但您需要移动一些内容。
基本上你需要为OnRowCreated创建一个事件然后 - 这是关键部分 - 使用FindControl方法找到DropDownList并最终将项目插入DDL。
澄清：我认为OnLoad中的代码试图填充DDL，但我没有看到代码框向下滚动。看起来你的代码是可靠的，我认为你只需要从OnRowBinding切换到OnRowCreated