2

我们在使用 Visual Studio 2008 ReportViewer 控件时遇到了一个奇怪的问题。具体来说,当我们在页面上有一个子控件,并且子控件本身承载一个报表查看器,并且报表有一个文档映射时,显示/隐藏文档映射按钮上的回发似乎丢失了,所以文档映射永远不会消失。我和 IPostBackEventHandler 一起玩,似乎没有得到任何结果;ReportViewer 本身实现了该接口,所以我认为我不在乎。无论如何,这是代码:

默认.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ReportViewerDocumentMapButtonStrippedExample._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div runat="server" id="div">

    </div>
    </form>
</body>
</html>

默认.aspx.cs:

using System;

namespace ReportViewerDocumentMapButtonStrippedExample {
    public partial class _Default : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
        }

        protected override void CreateChildControls() {
            base.CreateChildControls();
            FindControl("div").Controls.Add(new rvControl());
        }
    }
}

rvControl.cs:

using System.Collections.Generic;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using Microsoft.Reporting.WebForms;

namespace ReportViewerDocumentMapButtonStrippedExample {
    public class rvControl : HtmlGenericControl {

        protected override void CreateChildControls() {
            base.CreateChildControls();
            var rvMain = new ReportViewer {
                EnableViewState = true,
                ProcessingMode = ProcessingMode.Remote,
                ShowRefreshButton = false,
                AsyncRendering = true,
                Width = new Unit(100, UnitType.Percentage),
                Height = new Unit(2000, UnitType.Pixel),
                ShowCredentialPrompts = false,
                ID = "viewer",
            };
            rvMain.ServerReport.ReportPath = "/some/report/name";
            Controls.Add(rvMain);
        }

    }
}

有人对此有想法吗?

4

1 回答 1

2

微软为我们找到了答案。基本上,这是 ReportViewer 控件和控件生命周期中的一些混淆。该修复是对自定义控件的简单添加:

public override System.Web.UI.ControlCollection Controls {
    get {
        this.EnsureChildControls();
        return base.Controls;
    }
}
于 2009-12-16T18:29:24.493 回答