ASP.NET-访问FormView控件的最终呈现HTML

Justin Holdsclaw 发表于 Dev

贾斯汀·霍尔斯卡夫（Justin Holdsclaw）

我正在尝试使用单独的网页来生成可以通过AJAX返回到另一个网页以更新面板的HTML。但是，我找不到一种方法来访问呈现的HTML以通过Response.Write（...）返回。

我的网页代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="WarehouseDetails.aspx.cs" Inherits="WarehouseDetails" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="frmMain" runat="server">
        <div id="content" runat="server">
        <asp:FormView ID="fvwWhseDetails" runat="server" AllowPaging="false" RenderOuterTable="false">
            <ItemTemplate>
                <div class="col-md-8"><asp:TextBox ID="txtItemNum" runat="server" CssClass="form-control" Text='<%# Eval("OrderCode") %>' disabled/></div>
                ....
                ....
                ....
            </ItemTemplate>
        </asp:FormView>
        </div>
   </form>
</body>
</html>

页面加载后，它将呈现类似于以下内容的HTML：

<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>

</title></head>
<body>
    <form method="post" action="WarehouseDetails.aspx" id="frmMain">
        <div id="content">
            <div class="col-md-8"><input name="fvwWhseDetails$txtItemNum" type="text" value="159580" id="fvwWhseDetails_txtItemNum" class="form-control" disabled="" /></div>
            ....
            ....
            ....
        </div>
    </form>
</body>
</html>

我要完成的工作是返回与...区域一起包含的所有呈现的HTML。但是，我尝试过的任何方法似乎都无效。

在我的代码隐藏文件中，我尝试了以下用于HTML检索的方法，并在每个方法的下方注释了相应的错误：

public partial class WarehouseDetails : System.Web.UI.Page
{
    protected string strORAConnectionString = ConfigurationManager.ConnectionStrings["OraConnectionString"].ConnectionString;

    protected void Page_Load(object sender, EventArgs e)
    {
        string strSelect = @"...";

        using (OleDbConnection oraHQDB = new OleDbConnection(strORAConnectionString))
        {

            OleDbCommand command = new OleDbCommand(strSelect, oraHQDB);
            oraHQDB.Open();

            OleDbDataReader reader = command.ExecuteReader();
            if(reader.HasRows)
            {
                fvwWhseDetails.DataSource = reader;
                fvwWhseDetails.DataBind();

                // Everything up until this point works fine.
                // If the code below is excluded,
                // the page renders correctly.

                string resp;

                // Method 1 - try to access InnerHTML of <div id="content">...</div>
                System.Web.UI.HtmlControls.HtmlGenericControl div = (System.Web.UI.HtmlControls.HtmlGenericControl)frmMain.FindControl("content");
                string resp = div.InnerHtml;
                // Error generated:
                //    System.Web.HttpException:
                //    Cannot get inner content because the contents are not literal.

                // Method 2 - try to use RenderControl()
                StringWriter sw = new StringWriter();
                HtmlTextWriter w = new HtmlTextWriter(sw);
                frmMain.RenderControl(w);
                fvwWhseDetails.RenderControl(w);
                fvwWhseDetails.Row.RenderControl(w);                    
                div.RenderControl(w);
                resp = sw.GetStringBuilder().ToString();
                // Error generated: 
                //    System.Web.HttpException:
                //    Control '[control]' of type '[type]' must be placed inside a form tag with runat=server.

                Response.Write(resp);
            }
            else
            {
                Response.Write("No results found.");
            }
            Response.End();
            reader.Close();
        }
    }
}