如何在我的 winforms 应用程序中通过 ReportViewer 生成报告时禁用 Excel 导出选项？
补充： 特别是，我想隐藏引用 Excel 输出/导出任务的工具栏按钮，而不是处理 pdf 导出选项的工具栏按钮。
【问题讨论】：
标签： c# vb.net winforms reporting reportviewer
这将完成发帖人的要求（使用一点 LINQ 从集合中选择特定类型的对象）：
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;
}
}
【讨论】：
虽然从表面上看这似乎很容易，但导出选项却很难掌握。您只需执行以下操作即可获取报告查看器的工具条：
Dim myToolStrip As ToolStrip = DirectCast(ReportViewer1.Controls.Find("toolStrip1", True)(0), ToolStrip)
...您可以遍历 .Items 集合以使用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，并添加您自己的仅包含您需要的功能的按钮。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
【讨论】：
//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;
}
}
}
}
}
【讨论】：
请试试这个：
Dim instance As ReportViewer
instance.ShowExportButton = false
HTH
【讨论】：