Question

我正在构建一个Web应用程序来构建文档。该文件有段落（外部中继器）和分段（内部中继器）。我正在寻找的是一种向现有文件添加空白分段的方法。

我的标记：

<asp:Repeater ID="ParagraphRepeater" runat="server" 
   OnItemDataBound="ParagraphRepeater_ItemDataBound" >
   <ItemTemplate>
       <asp:TextBox ID="ParagraphTitleTextBox" runat="server" Font-Bold="true" Width="300px" 
           Text='<%# Eval("ParagraphTitle") %>'></asp:TextBox>
       <br />
       <asp:TextBox ID="ParagraphTextTextBox" runat="server" TextMode="MultiLine" Wrap="true"
                        width="1100px" Height="50px" Text='<%# Eval("ParagraphText") %>'></asp:TextBox>
       <asp:Button ID="DeleteParagraphButton" runat="server" Text="Delete" OnClick="DeleteParagraphButton_Click" />
       <asp:Repeater ID="SubParagraphRepeater" runat="server" DataSourceID="SubParagraphSqlDataSource">
           <ItemTemplate>
               <div style="margin-left: 30px">
                   <asp:TextBox ID="SubParagraphTitleTextBox" runat="server" Font-Underline="true" Width="200px"
                                    Text='<%# Eval("SubParagraphTitle") %>'></asp:TextBox>
                   <br />
                   <asp:TextBox ID="SubParagraphTextTextBox" runat="server" TextMode="MultiLine" Wrap="true"
                                    Width="1050px" Height="50px" Text='<%# Eval("SubParagraphText") %>'></asp:TextBox>
                   <asp:Button ID="DeleteSubParagraphButton" runat="server" Text="Delete" 
                                    OnClick="DeleteSubParagraphButton_Click" />
                   <br />
               </div>
           </ItemTemplate>
       </asp:Repeater>
       <br />
       <br />
       <br />
   </ItemTemplate>

我的代码：

protected void MultiView1_ActiveViewChanged(object sender, EventArgs e)
{
    if (MultiView1.GetActiveView() == InputView) 
    {
        BuildParagraphDataTable();
        BuildSubParagraphDataTable();

        if (RevisionsDropDownList.SelectedValue == "0")
        {
            // User is creating a new document
            // Call method to create a datatable for the form row
            SetFormRow();

            // Call method to create a datatable for the paragraph row
            AddParagraph();

            DataTable dt = (DataTable)ViewState["ParagraphTable"];
            ParagraphRepeater.DataSource = dt;
            ParagraphRepeater.DataBind();

        }
        else
        {
            // User is opening an existing document
            // Get the formId and save it to ViewState
            int formId = Convert.ToInt32(RevisionsDropDownList.SelectedValue);
            ViewState["FormId"] = formId.ToString();

            // Bind the Paragraph repeater to its sqlDataSource
            ParagraphRepeater.DataSource = ParagraphSqlDataSource;
            ParagraphRepeater.DataBind();
        }
    }
}
protected void AddParagraph()
{
    int paragraphId;

    DataTable dt = (DataTable)ViewState["ParagraphTable"];
    DataRow dr = dt.NewRow();

    if (ViewState["ParagraphId"] != null)
        paragraphId = Convert.ToInt32(ViewState["ParagraphId"]);
    else
        paragraphId = 0;

    paragraphId--;

    int formId = Convert.ToInt32(ViewState["FormId"]);

    dr["ParagraphId"] = paragraphId;
    dr["FormId"] = formId;
    dr["ParagraphTitle"] = string.Empty;
    dr["ParagraphText"] = string.Empty;
    dr["CreatorId"] = string.Empty;
    dr["RevisorId"] = string.Empty;
    dt.Rows.Add(dr);

    ViewState["ParagraphTable"] = dt;
    ViewState["ParagraphId"] = paragraphId;

}
protected void AddSubParagraph()
{
    DataTable dt = (DataTable)ViewState["SubParagraphTable"];
    DataRow dr = dt.NewRow();

    int paragraphId = Convert.ToInt32(ViewState["ParagraphId"]);

    dr["ParagraphId"] = paragraphId;
    dr["SubParagraphTitle"] = string.Empty;
    dr["SubParagraphText"] = string.Empty;
    dr["CreatorId"] = string.Empty;
    dr["RevisorId"] = string.Empty;
    dt.Rows.Add(dr);

    ViewState["SubParagraphTable"] = dt;
}

protected void ParagraphRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        AddParagraph();
        DataTable parentDataTable = (DataTable)ViewState["ParagraphTable"];
        DataRow lastDTRow = parentDataTable.Rows[parentDataTable.Rows.Count - 1];

        int paragraphId = (int)ViewState["ParagraphId"];
        DataRowView thisParagraphRowView = (DataRowView)e.Item.DataItem;

        paragraphId = (int)thisParagraphRowView.Row["ParagraphId"];

        lastDTRow["ParagraphId"] = thisParagraphRowView.Row["ParagraphId"];
        lastDTRow["FormId"] = thisParagraphRowView.Row["FormId"];
        lastDTRow["ParagraphTitle"] = thisParagraphRowView.Row["ParagraphTitle"];
        lastDTRow["ParagraphText"] = thisParagraphRowView.Row["ParagraphText"];

        ViewState["ParagraphTable"] = parentDataTable;
        ViewState["ParagraphId"] = paragraphId.ToString();

        DataTable childDataTable;
        DataRowView thisSubParagraphRowView;

        Repeater childRepeater = (Repeater)e.Item.FindControl("SubParagraphRepeater");

        foreach (RepeaterItem item in childRepeater.Items)
        {
            if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
            {
                thisSubParagraphRowView = (DataRowView)item.DataItem;
                if (thisSubParagraphRowView != null)
                {
                    AddSubParagraph();
                    childDataTable = (DataTable)ViewState["SubParagraphTable"];
                    lastDTRow = childDataTable.Rows[childDataTable.Rows.Count - 1];

                    lastDTRow["ParagraphId"] = thisSubParagraphRowView.Row["ParagraphId"];
                    lastDTRow["SubParagraphTitle"] = thisSubParagraphRowView.Row["SubParagraphTitle"];
                    lastDTRow["SubParagraphText"] = thisSubParagraphRowView.Row["SubParagraphText"];

                    ViewState["SubParagraphTable"] = childDataTable;
                }
            }
        }
    }
}

当用户打开现有表单时，itemDataBound代码会填充段落和子段的数据表。（这些数据表将用于更新数据库。）

当用户创建新表单时，将调用setForm（）和addParagraph（）方法来创建表单ID并添加空白段落。没有添加空白分段 - 用户必须单击按钮才能执行此操作。

对于数据模型，有一个Form（用户从ddl中选择它）。表格可以包含1到多个段落，段落可以包含0到多个子段落。

我需要在内部转发器中为外转发器中的特定行创建一个空行（光标当前所在的段落，或者如果光标位于子段中，即父段落）。我怎么做？我已经在谷歌上进行了大量的挖掘，但找不到解决此问题的条目。感谢。

Answer 1

答案是将“AddSubParagraph”按钮从独立位置移动到外部转发器内部。这样，可以使用按钮的“NamingContainer”属性来定位转发器。然后是找到内部转发器Repeater innerRepeater = (Repeater)outerRepeater.FindControl("childRepeater");并向其添加一行的问题。我可以添加行但是我遇到了DataBinding内部转发器的问题。

我所做的是为每个中继器保持数据表在视图状态中，并在中继器和数据表之间镜像数据。当我需要添加一行时，我将它添加到数据表中，然后将转发器数据绑定到数据表。但是我收到一个错误：它出错的行是childRepeater.Datasource = dt;。错误是“DataSource和DataSourceId都已定义。删除一个定义。” DataSourceId在标记中的childRepeater上定义，指向SQLDataSource。所以我需要找到一种方法在运行时在检索时将内部转发器绑定到它的SQLDataSource。

一个障碍：我在想我会使用ItemDataBound事件来进行数据绑定。但我已经有很多代码（见上文）。我可以使用另一个有意义的事件吗？

在运行时c＃

1 个答案: