C# 使用（DropDownList）e.Row.FindControl时，我将变为null
这是我的代码，它给出了ddl=null的值：C# 使用（DropDownList）e.Row.FindControl时，我将变为null,c#,asp.net,gridview,C#,Asp.net,Gridview,这是我的代码，它给出了ddl=null的值： //event handler to bind the data to the row before rendering the gridview protected void gridview1_RowDataBound(object sender ,GridViewRowEventArgs e) { if ((e.Row.RowType == DataControlRowType.DataRow)&&(e.Row.Data
//event handler to bind the data to the row before rendering the gridview
protected void gridview1_RowDataBound(object sender ,GridViewRowEventArgs e)
{
if ((e.Row.RowType == DataControlRowType.DataRow)&&(e.Row.DataItem!=null))
{
//DropDownList ddlNo = (DropDownList)e.Row.FindControl("ddlNo");
DropDownList ddlNo = (DropDownList)e.Row.FindControl("ddlNo");
if (ddlNo != null)
{
ddlNo.DataSource = Test.GetData();
ddlNo.DataBind();
ddlNo.SelectedValue = gridview1.DataKeys[e.Row.RowIndex].Values[0].ToString();//datakeys are used to retain the value of the no. in edit mode
}
}
}
<asp:GridView ID="gridview1" runat="server" AutoGenerateColumns="false" AutoGenerateDeleteButton="false" AutoGenerateEditButton="false" ShowFooter="true" EmptyDataText="No data available." PagerStyle-HorizontalAlign="Right" AllowPaging="true" AllowSorting="true" GridLines="Vertical" Width="98%" EnableViewState="true" OnRowCancelingEdit="gridview1_RowCancelingEdit" OnRowDataBound="gridview1_RowDataBound" OnRowEditing="gridview1_RowEditing" OnRowUpdating="gridview1_RowUpdating" OnRowCommand="gridview1_RowCommand" OnRowDeleting="gridview1_RowDeleting" DataKeyNames="testID">
<Columns>
<asp:TemplateField HeaderText="Select" HeaderStyle-HorizontalAlign="Left">
<ItemTemplate>
<asp:Label ID="lblSelect" runat="server" Text="Select"></asp:Label>
<%-- <asp:CheckBox ID="chkSelect" runat="server" AutoPostBack="true" OnCheckedChanged="chkSelect_CheckChanged" />--%>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:BoundField DataField="testID" HeaderText="SearchId" />
<asp:TemplateField HeaderText="Name" HeaderStyle-HorizontalAlign="Left">
<EditItemTemplate>
<asp:TextBox ID="txtName" runat="server" Text='<%#Eval("testDesc") %>' />
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewName" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblName" runat="server" Text='<%# Bind("testDesc") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="No." HeaderStyle-HorizontalAlign="Left">
<EditItemTemplate>
<asp:DropDownList ID="ddlNo" runat="server" DataTextField="testNo" DataValueField="testNo" />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblNo" runat="server" Text='<%# Bind("testNo") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlNewNo" runat="server" DataTextField="testNo" DataValueField="testNo">
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit" ShowHeader="False">
<EditItemTemplate>
<asp:LinkButton ID="linkbt1" runat="server" CausesValidation="true" CommandName="Update" Text="Update">
</asp:LinkButton>
<asp:LinkButton ID="linkbt2" runat="server" CausesValidation="false" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<ItemTemplate>
<asp:LinkButton ID="linkbt1" runat="server" CausesValidation="false" CommandName="Edit" Text="Edit">
</asp:LinkButton>
</ItemTemplate>
<FooterTemplate>
<asp:LinkButton ID="linkbt2" runat="server" CausesValidation="false" CommandName="AddNew" Text="AddNew">
</asp:LinkButton>
</FooterTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="Delete" ShowDeleteButton="true" ShowHeader="true" />
</Columns>
</asp:GridView>
//event handler to bind the data to the row before rendering the gridview
protected void gridview1_RowDataBound(object sender ,GridViewRowEventArgs e)
{
if ((e.Row.RowType == DataControlRowType.DataRow)&&(e.Row.DataItem!=null))
{
//DropDownList ddlNo = (DropDownList)e.Row.FindControl("ddlNo");
DropDownList ddlNo = (DropDownList)e.Row.FindControl("ddlNo");
if (ddlNo != null)
{
ddlNo.DataSource = Test.GetData();
ddlNo.DataBind();
ddlNo.SelectedValue = gridview1.DataKeys[e.Row.RowIndex].Values[0].ToString();//datakeys are used to retain the value of the no. in edit mode
}
}
}
<asp:GridView ID="gridview1" runat="server" AutoGenerateColumns="false" AutoGenerateDeleteButton="false" AutoGenerateEditButton="false" ShowFooter="true" EmptyDataText="No data available." PagerStyle-HorizontalAlign="Right" AllowPaging="true" AllowSorting="true" GridLines="Vertical" Width="98%" EnableViewState="true" OnRowCancelingEdit="gridview1_RowCancelingEdit" OnRowDataBound="gridview1_RowDataBound" OnRowEditing="gridview1_RowEditing" OnRowUpdating="gridview1_RowUpdating" OnRowCommand="gridview1_RowCommand" OnRowDeleting="gridview1_RowDeleting" DataKeyNames="testID">
<Columns>
<asp:TemplateField HeaderText="Select" HeaderStyle-HorizontalAlign="Left">
<ItemTemplate>
<asp:Label ID="lblSelect" runat="server" Text="Select"></asp:Label>
<%-- <asp:CheckBox ID="chkSelect" runat="server" AutoPostBack="true" OnCheckedChanged="chkSelect_CheckChanged" />--%>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:BoundField DataField="testID" HeaderText="SearchId" />
<asp:TemplateField HeaderText="Name" HeaderStyle-HorizontalAlign="Left">
<EditItemTemplate>
<asp:TextBox ID="txtName" runat="server" Text='<%#Eval("testDesc") %>' />
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNewName" runat="server"></asp:TextBox>
</FooterTemplate>
<ItemTemplate>
<asp:Label ID="lblName" runat="server" Text='<%# Bind("testDesc") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="No." HeaderStyle-HorizontalAlign="Left">
<EditItemTemplate>
<asp:DropDownList ID="ddlNo" runat="server" DataTextField="testNo" DataValueField="testNo" />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblNo" runat="server" Text='<%# Bind("testNo") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlNewNo" runat="server" DataTextField="testNo" DataValueField="testNo">
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit" ShowHeader="False">
<EditItemTemplate>
<asp:LinkButton ID="linkbt1" runat="server" CausesValidation="true" CommandName="Update" Text="Update">
</asp:LinkButton>
<asp:LinkButton ID="linkbt2" runat="server" CausesValidation="false" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<ItemTemplate>
<asp:LinkButton ID="linkbt1" runat="server" CausesValidation="false" CommandName="Edit" Text="Edit">
</asp:LinkButton>
</ItemTemplate>
<FooterTemplate>
<asp:LinkButton ID="linkbt2" runat="server" CausesValidation="false" CommandName="AddNew" Text="AddNew">
</asp:LinkButton>
</FooterTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="Delete" ShowDeleteButton="true" ShowHeader="true" />
</Columns>
</asp:GridView>
有人能提供相关的解决方案吗？您将ddl编号放在
页脚模板中，但您只在中检查它（e.Row.RowType==DataControlRowType.DataRow）
将其更改为FooterRow，它应该会找到它
将上面的行更改为
如果（e.Row.RowType==DataControlRowType.Footer&&e.Row.DataItem！=null）您将ddl号放入页脚模板中，但您只在中检查（e.Row.RowType==DataControlRowType.DataRow）
将其更改为FooterRow，它应该会找到它
将上面的行更改为
如果（e.Row.RowType==DataControlRowType.Footer&&e.Row.DataItem！=null）
' />
--%>
“/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblapp" runat="server" Text='<%# Eval("AppName") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlAppFooter" class="SearchBoxRTD" runat="server" DataTextField="AppName"
DataValueField="SNO">
</asp:DropDownList>
</FooterTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="TestType" HeaderStyle-Width="50">
<EditItemTemplate>
<asp:DropDownList ID="ddlTestTypeDataRow" class="SearchBoxRTD" runat="server" DataTextField="Testingtypedescription"
DataValueField="TestingTypeID">
</asp:DropDownList>
<asp:HiddenField ID="hdnTesttype" runat="server" Value='<%# Bind("Testtype") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblTestType" runat="server" Text='<%# Eval("Testingtypedescription") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlTestTypeFooter" class="SearchBoxRTD" runat="server" DataTextField="Testingtypedescription"
DataValueField="TestingTypeID">
</asp:DropDownList>
</FooterTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Scenario Type" HeaderStyle-Width="50">
<EditItemTemplate>
<asp:DropDownList ID="ddlScenarioTypeDataRow" class="SearchBoxRTD" runat="server" DataTextField="ScenarioTypedescription"
DataValueField="ScenarioTypeID">
</asp:DropDownList>
<asp:HiddenField ID="hdnScenariotype" runat="server" Value='<%# Bind("ScenarioTypeID") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblScenarioType" runat="server" Text='<%# Eval("ScenarioTypedescription") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlScenarioTypeFooter" class="SearchBoxRTD" runat="server"
DataTextField="ScenarioTypedescription" DataValueField="ScenarioTypeID">
</asp:DropDownList>
</FooterTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Scenario">
<EditItemTemplate>
<asp:TextBox ID="txtScenario" runat="server" Text='<%# Bind("Scenario") %>'></asp:TextBox>
<asp:RequiredFieldValidator ID="RFDGEdUI" runat="server" Font-Bold="true" ErrorMessage="*"
ControlToValidate="txtScenario" ValidationGroup="EditScenario"></asp:RequiredFieldValidator>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LblScenario" runat="server" Text='<%# Bind("Scenario") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtfootScenario" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RFDGScenario" runat="server" Font-Bold="true" ErrorMessage="*"
ControlToValidate="txtfootScenario" ValidationGroup="AddScenario"></asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Status">
<EditItemTemplate>
<asp:CheckBox ID="chkScenariostatus" runat="server" Checked='<%# Bind("Status") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LblScenarioStatus" runat="server" Text='<%# Bind("Status") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:CheckBox ID="chkScenariofooter" runat="server" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit" ShowHeader="False">
<EditItemTemplate>
<asp:LinkButton ID="lbkUpdateScenario" runat="server" ValidationGroup="EditScenario"
CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton>
<asp:LinkButton ID="lnkCancelScenario" runat="server" CausesValidation="False" CommandName="Cancel"
Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<FooterTemplate>
<asp:LinkButton ID="lnkAddScenario" runat="server" ValidationGroup="AddScenario"
CausesValidation="True" CommandName="Insert" Text="Insert"></asp:LinkButton>
</FooterTemplate>
<ItemTemplate>
<asp:LinkButton ID="lnkEditScenario" runat="server" CausesValidation="False" CommandName="Edit"
Text="Edit"></asp:LinkButton>
</ItemTemplate>
<HeaderStyle HorizontalAlign="Left" />
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
No Applications available!
</EmptyDataTemplate>
</asp:GridView>
没有可用的应用程序！
--------------------------------CS--------------------------------------------------------
受保护的void grdScenario_RowDataBound（对象发送方，GridViewRowEventArgs e）
{
尝试
{
数据