DetailView的EditTemplate中FindControl问题，好长时间了，在线等~~~

Question

DetailView的EidtTemplate下有一个字段用了FileUpload1，但用了FindControl方法却不生效，提示错误为“指定的参数已超出有效值的范围。
参数名: index ”
//编辑
    protected void lbtnEdit_Click(object sender, EventArgs e)
    {
        //Response.Write("lbtnEdit_Click");
        FileUpload FileUpload1 = (FileUpload)this.DetailsView1.Rows[0].Cells[4].FindControl("FileUpload1");
        //Response.Write("aa");
        FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
    }lbtnEdit是“编辑”按钮的id，因为DetailView帮定的是GridView的id（主键），所以Rows[0]下标用了0，
对应字段是第5个，所以Cell[4]下标用了4，然后FindControl("FileUpload1")获取控件，但失败了
提示错误就是“指定的参数已超出有效值的范围。
参数名: index ”
请专家看看~

Answer 1

Rows[0].Cells[4].FindControl改成Rows[0].FindControl试试。

Answer 2

发表于：2007-11-30 13:02:221楼 得分:0 
Rows[0].Cells[4].FindControl 改成 Rows[0].FindControl 试试。 
该了后，提示错误变成了“未将对象引用设置到对象的实例。”
想的是获取了FileUpload1之后，再给FileUpload1添加属性FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
可是现在是FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
是红色提示
可能是哪里的问题呢？
已经一天了，baidu大都这么说，可是我这样就是不对~

Answer 3

你要不要调试跟踪一下 
看你的 Rows[0].Cells[4] 的控件类型是什么
然后再作判断

Answer 4

(FileUpload)this.DetailsView1.FindControl("FileUpload1"); 

Answer 5

是了
<asp:TemplateField HeaderText="图片名称" SortExpression="ImageName">
                    <EditItemTemplate>
 <asp:Image ID="Image1" runat="server" /><br />
                        <asp:FileUpload ID="FileUpload1" runat="server" />                    </EditItemTemplate>
<InsertItemTemplate>
                        <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("ImageName") %>'></asp:TextBox>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label3" runat="server" Text='<%# Bind("ImageName") %>'></asp:Label>
                    </ItemTemplate>

Answer 6

哦,原来是这样,那当然找不到了,因为初始情况下是itemtemplate中的控件,关注中...

Answer 7

C# codeFileUpload FileUpload1=(FileUpload)this.DetailsView1.FindControl("FileUpload1"); 
之后给FileUpload1添加属性
FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
之后，提示错误：“未将对象引用设置到对象的实例。”
难道是FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");的问题？

Answer 8

发表于：2007-11-30 13:42:498楼 得分:0 
哦,原来是这样,那当然找不到了,因为初始情况下是itemtemplate中的控件,关注中... ？？？
那应该是怎样才能获取到？
请指点

Answer 9

我是在”编辑“按钮的Click事件里，写的FileUpload1=(FileUpload)this.DetailsView1.FindControl("FileUpload1");  
这个时候，模式已经变为EditMode了
难道是这里的问题？

Answer 10

你首先应该将detailsview的状态变成编辑，再绑定才可找到，因为fileupload是在EidtTemplate里    protected void lbtnEdit_Click(object sender, EventArgs e)
        {
            //将DetailsView1变成编辑状态
            this.DetailsView1.ChangeMode(DetailsViewMode.Edit);
            
            Bind();//此函数里将DetailsView1重新绑定            FileUpload FileUpload1 = (FileUpload)this.DetailsView1.Rows[0].Cells[4].FindControl("FileUpload1");
            FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
        } 

Answer 11

angelHeaderUpdate1.Attributes.Add("onpropertychange", "this.value!=''? Image1.src=this.value:'~/WebUI/Portrait/images/tu/200511172092734480.jpg';");
看看这个

Answer 12

正式要获得<EditItemTemplate>的时候的Upload1，这个时候Upload1是存在的

Answer 13

发表于：2007-11-30 13:48:3313楼 得分:0 
你首先应该将detailsview的状态变成编辑，再绑定才可找到，因为fileupload是在EidtTemplate里 C# code
    protected void lbtnEdit_Click(object sender, EventArgs e)
        {
            //将DetailsView1变成编辑状态
            this.DetailsView1.ChangeMode(DetailsViewMode.Edit);
            
            Bind();//此函数里将DetailsView1重新绑定            FileUpload FileUpload1 = (FileUpload)this.DetailsView1.Rows[0].Cells[4].FindControl("FileUpload1");
            FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
        } 
我是自动帮定的
加上这句//将DetailsView1变成编辑状态
            this.DetailsView1.ChangeMode(DetailsViewMode.Edit);
还是提示：未将对象引用设置到对象的实例。
 

Answer 14

我当然知道你是自动绑定的，你要将DetailsView1的状态变成编辑就必须再绑定一次，所以你要将你现在的绑定代码分离出来放在一个函数中，比如上面的Bind（），然后你pageload时调用一次，此处再调用一次

Answer 15

<body>
    <form id="form1" runat="server">
    <div class="font12">
        <asp:DetailsView ID="DetailsView1" runat="server" Height="50px" Width="680px" AutoGenerateRows="False" DataSourceID="SqlDataSource2" DataKeyNames="ID" BackColor="#CCCCCC" OnItemInserting="DetailsView1_ItemInserting" OnItemCommand="DetailsView1_ItemCommand" OnModeChanged="DetailsView1_ModeChanged" OnModeChanging="DetailsView1_ModeChanging" OnItemUpdating="DetailsView1_ItemUpdating" OnDataBinding="DetailsView1_DataBinding" OnDataBound="DetailsView1_DataBound" OnPageIndexChanged="DetailsView1_PageIndexChanged" OnPageIndexChanging="DetailsView1_PageIndexChanging" OnItemCreated="DetailsView1_ItemCreated">
            <Fields>
                <asp:BoundField DataField="ID" HeaderText="编号" InsertVisible="False" ReadOnly="True"
                    SortExpression="ID" >
                    <ItemStyle ForeColor="Blue" />
                </asp:BoundField>
                <asp:TemplateField HeaderText="所属类别" SortExpression="SmallClassName">
                    <EditItemTemplate>
                        <%--<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("SmallClassName") %>'></asp:TextBox>--%>
                        <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataMember="DefaultView" DataTextField="SmallClassName" DataValueField="SmallClassID" SelectedValue='<%# Bind("SmallClassID") %>'>
                        </asp:DropDownList><asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:hjConnectionString %>"
                            SelectCommand="SELECT [SmallClassID], [SmallClassName] FROM [ZxalSmallClass]"></asp:SqlDataSource>
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <%--<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("SmallClassName") %>'></asp:TextBox>--%>
                        <asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="SqlDataSource1" DataTextField="SmallClassName" DataValueField="SmallClassID">
                        </asp:DropDownList><asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:hjConnectionString %>"
                            SelectCommand="SELECT [SmallClassID], [SmallClassName] FROM [ZxalSmallClass]"></asp:SqlDataSource>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("SmallClassName") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="新闻标题" SortExpression="Title">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("Title") %>' Width="200px"></asp:TextBox>
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("Title") %>' Width="200px"></asp:TextBox>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label4" runat="server" Text='<%# Bind("Title") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="文章内容" SortExpression="Content">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Content") %>' Width="400px" Height="300px" TextMode="MultiLine"></asp:TextBox>&nbsp;<br />
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="TextBox2"
                            ErrorMessage="文章内容不能为空 "></asp:RequiredFieldValidator>
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Content") %>' Height="300px" TextMode="MultiLine" Width="400px"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox2"
                            ErrorMessage="文章内容不能为空"></asp:RequiredFieldValidator>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label2" runat="server" Text=<%# DataBinder.Eval(Container.DataItem, "Content", "{0}").Replace("&nbsp;", "　").Replace("  ", "　").Replace("\n", "<br>") %> ></asp:Label>
                        <%--<asp:Label ID="Label2" runat="server" Text=<%# Bind("Content") %> ></asp:Label>--%>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="图片名称" SortExpression="ImageName">
                    <EditItemTemplate>
                        <%--<asp:Label ID="Label3" runat="server" Text='<%# Bind("ImageName") %>'></asp:Label>--%>
                        <%--<img id="Image1" src="upload/<%# DataBinder.Eval(Container.DataItem,"ImageName","{0}") %>" width="150" height="150" /><br />
                        <input type="file" id="FileUpload1" onpropertychange="imageBroser();" OnKeyPress="event.returnValue=IsDigit();" /><br />--%>
                        <%--<asp:FileUpload name="FileUpload1" runat="server" Width="400px" onpropertychange="imageBroser();" OnKeyPress="event.returnValue=IsDigit();" />--%>
                        <asp:Image ID="Image1" runat="server" /><br />
                        <asp:FileUpload ID="FileUpload1" runat="server" />
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("ImageName") %>'></asp:TextBox>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label3" runat="server" Text='<%# Bind("ImageName") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="PublishDate" HeaderText="发布时间" SortExpression="PublishDate" InsertVisible="False" ReadOnly="True" />
                <asp:BoundField DataField="ClickCount" HeaderText="点击量" SortExpression="ClickCount" InsertVisible="False" ReadOnly="True" />
                <asp:TemplateField HeaderText="管理" ShowHeader="False">
                    <EditItemTemplate>
                        <asp:LinkButton ID="lbtnUpdate" runat="server" CausesValidation="True" CommandName="Update"
                            Text="更新" OnClick="lbtnUpdate_Click"></asp:LinkButton>
                        <asp:LinkButton ID="lbtnCancel" runat="server" CausesValidation="False" CommandName="Cancel"
                            Text="取消" OnClick="lbtnCancel_Click"></asp:LinkButton>
                    </EditItemTemplate>
                    <ControlStyle ForeColor="Blue" />
                    <ItemStyle HorizontalAlign="Center" />
                    <ItemTemplate>
                        <asp:LinkButton ID="lbtnEdit" runat="server" CausesValidation="False" CommandName="Edit"
                            Text="编辑" OnClick="lbtnEdit_Click"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Fields>
        </asp:DetailsView>
    </div>
    </form>
</body>

Answer 16

你后台没有类似this.DetailsView1.DataBind()的代码吗？如果有请贴出来

Answer 17

加QQ好吗？
解决立马结分~
38391232
没有this.DetailsView1.DataBind()这样的代码

Answer 18

经过 seedling_lq  的帮助
解决了
下面是代码：
protected void lbtnEdit_Click(object sender, EventArgs e)
        {
            //将DetailsView1变成编辑状态
            this.DetailsView1.ChangeMode(DetailsViewMode.Edit);
            //此函数里将DetailsView1重新绑定
            this.DetailsView1.DataBind();
            Image Image1 = (Image)this.DetailsView1.FindControl("Image1");
            FileUpload FileUpload1 = (FileUpload)this.DetailsView1.FindControl("FileUpload1");
            //FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('Image1').src=document.getElementById('FileUpload1').value");
            FileUpload1.Attributes.Add("onpropertychange", "javascript:document.getElementById('"+Image1.ClientID+"').src=document.getElementById('"+FileUpload1.ClientID+"').value");
        }ClientiD表示运行时控件在页面上的动态id，很常用
结分~