XtraReports > 示例 > 如何： 改变预览窗体中命令的可视性

这个示例展示了如何改变报表的 打印预览 窗体中的工具栏按钮和菜单项的可视性。 要这样做，则把报表指派到 ReportPrintTool 实例，并使用 PrintTool.PrintingSystem 的 PrintingSystemBase.SetCommandVisibility 方法。

下面的代码隐藏了 Watermark 工具栏按钮和相应的菜单项，使 DocumentMap 工具栏按钮和菜单项可视，并使 ExportToCsv 和 ExportToTxt 命令在窗口的菜单和工具栏中都可视。 注意，由 PrintingSystemCommand 枚举表示所有命令的列表。

C#CopyCode image复制代码
using System;
using System.Windows.Forms;
using DevExpress.XtraPrinting;
using DevExpress.XtraReports.UI;
// ...

private void button1_Click(object sender, EventArgs e) {
    // Create a report instance, assigned to a Print Tool.
    ReportPrintTool pt = new ReportPrintTool(new XtraReport1());

    // Get the Print Tool's printing system.
    PrintingSystemBase ps = pt.PrintingSystem;

    // Hide the Watermark toolbar button, and also the Watermark menu item.
    if (ps.GetCommandVisibility(PrintingSystemCommand.Watermark) 
        != CommandVisibility.None) {
        ps.SetCommandVisibility(PrintingSystemCommand.Watermark, 
            CommandVisibility.None);
    }

    // Show the Document Map toolbar button and menu item.
    ps.SetCommandVisibility(PrintingSystemCommand.DocumentMap, 
        CommandVisibility.All);

    // Make the "Export to Csv" and "Export to Txt" commands visible.
    ps.SetCommandVisibility(new PrintingSystemCommand[] 
{ PrintingSystemCommand.ExportCsv, PrintingSystemCommand.ExportTxt }, CommandVisibility.All);

    // Show the report's preview.
    pt.ShowPreview();
}
Visual BasicCopyCode image复制代码
Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraPrinting
Imports DevExpress.XtraReports.UI
' ...

Private Sub button1_Click(ByVal sender As Object, _ 
ByVal e As EventArgs) Handles button1.Click
    ' Create a report instance, assigned to a Print Tool.
    Dim pt As New ReportPrintTool(New XtraReport1())

    ' Get the Print Tool's printing system.
    Dim ps As PrintingSystemBase = pt.PrintingSystem

    ' Hide the Watermark toolbar button, and also the Watermark menu item.
    If ps.GetCommandVisibility(PrintingSystemCommand.Watermark) <> CommandVisibility.None Then
        ps.SetCommandVisibility(PrintingSystemCommand.Watermark, CommandVisibility.None)
    End If

    ' Show the Document Map toolbar button and menu item.
    ps.SetCommandVisibility(PrintingSystemCommand.DocumentMap, CommandVisibility.All)

    ' Make the "Export to Csv" and "Export to Txt" commands visible.
    ps.SetCommandVisibility(New PrintingSystemCommand() { PrintingSystemCommand.ExportCsv, _ 
        PrintingSystemCommand.ExportTxt }, CommandVisibility.All)

    ' Show the report's preview.
    pt.ShowPreview()
End Sub

CodeCentralShow Me

在 DevExpress Code Central 数据库中可以找到完整的示例项目，网址是 http://www.devexpress.com/example=E105。 取决于目标平台类型 (ASP.NET、WinForms 等)，可以在线运行本示例，或者下载自动可执行的示例。

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