通过 ReportViewer 生成报告时禁用 Excel 导出选项

Question

当我在 winforms 应用程序中通过 ReportViewer 生成报告时，如何禁用 Excel 导出选项？

添加： 特别是，我想隐藏引用 Excel 输出/导出任务的工具栏按钮，而不是隐藏处理 pdf 导出选项的按钮。

Answer 1

这将完成海报要求的内容（使用一点 LINQ 从集合中选择某些类型的对象）：

    private void DisableReportViewerExportExcel()
    {
        var toolStrip = this.ReportViewer.Controls.Find("toolStrip1", true)[0] as ToolStrip;

        if (toolStrip != null)
            foreach (var dropDownButton in toolStrip.Items.OfType<ToolStripDropDownButton>())
                dropDownButton.DropDownOpened += new EventHandler(dropDownButton_DropDownOpened);
    }

    void dropDownButton_DropDownOpened(object sender, EventArgs e)
    {
        if (sender is ToolStripDropDownButton)
        {
            var ddList = sender as ToolStripDropDownButton;
            foreach (var item in ddList.DropDownItems.OfType<ToolStripDropDownItem>())
                if (item.Text.Contains("Excel"))
                    item.Enabled = false;
        }
    }

Answer 2

虽然从表面上看这似乎很容易，但导出选项很难掌握。您可以通过简单地执行以下操作来获取报表查看器的工具条：

Dim myToolStrip As ToolStrip = DirectCast(ReportViewer1.Controls.Find("toolStrip1", True)(0), ToolStrip)

...您可以迭代 .Items 集合以对按钮执行您喜欢的操作，但是导出按钮的 DropDownItems 集合始终显示为空。

因此，简单的解决方案是摆脱默认的导出按钮，并添加您自己的导出按钮，仅包含您需要的功能。所以在你的表单构造函数中：

//Hide the default export button
ReportViewer1.ShowExportButton = False

//Define a new button
Dim newExportButton As New ToolStripButton("Export PDF", Nothing, AddressOf Me.ExportPDF, "newExport")

//And add it to the toolstrip
DirectCast(ReportViewer1.Controls.Find("toolStrip1", True)(0), ToolStrip).Items.Add(newExportButton)

那么你需要做的就是处理实际的导出：

Private Sub ExportPDF()

    Dim warnings As Microsoft.Reporting.WinForms.Warning()
    Dim streamids As String()
    Dim mimeType As String = ""
    Dim encoding As String = ""
    Dim extension As String = ""

    Dim bytes As Byte() = ReportViewer1.LocalReport.Render("PDF", Nothing, mimeType, encoding, extension, streamids, warnings)

    Dim fs As New IO.FileStream("C:\export.pdf", IO.FileMode.Create)
    fs.Write(bytes, 0, bytes.Length)
    fs.Close()
    fs.Dispose()

End Sub

Answer 3

//Call This function from Page_Load Event
private void CustomizeRV(System.Web.UI.Control reportControl)
{
    foreach (System.Web.UI.Control childControl in reportControl.Controls)
    {
        if (childControl.GetType() == typeof(System.Web.UI.WebControls.DropDownList)) 
        { 
            System.Web.UI.WebControls.DropDownList ddList = (System.Web.UI.WebControls.DropDownList)childControl;
            ddList.PreRender += new EventHandler(ddList_PreRender); 
        }
        if (childControl.Controls.Count > 0) 
        { 
            CustomizeRV(childControl); 
        } 
    }
}

//Dropdown prerender event
//You can hide any option from ReportViewer( Excel,PDF,Image )   
void ddList_PreRender(object sender, EventArgs e)
{
    if (sender.GetType() == typeof(System.Web.UI.WebControls.DropDownList))
    {
        System.Web.UI.WebControls.DropDownList ddList = (System.Web.UI.WebControls.DropDownList)sender; 
        System.Web.UI.WebControls.ListItemCollection listItems = ddList.Items;

        if ((listItems != null) && (listItems.Count > 0) && (listItems.FindByText("Excel") != null))
        {
            foreach (System.Web.UI.WebControls.ListItem list in listItems)
            {
                if (list.Text.Equals("Excel"))
                {
                    list.Enabled = false;
                }
            }
        }
    }
}

Answer 4

请尝试这个：

Dim instance As ReportViewer

instance.ShowExportButton = false

HTH