c# - 在没有打印预览的情况下将 RDLC 打印到预定义的打印机

Question

在我的 C# winform 应用程序中，我需要将 rdlc 报告直接打印到非默认打印机，所以我需要指定打印机名称/路径并直接发送，任何人都可以参考一个好的例子吗？到目前为止我发现的所有内容都直接打印到默认打印机，我需要在打印 rdlc 报告之前定义打印机。

这样做的原因是因为我有 3 台打印机连接到 PC，分别是条形打印机、收据打印机和厨房打印机。收据打印机是默认打印机。所以向它发送 rdlc 报告非常简单，因为它是默认设置，我关心的是如何将报告发送到厨房和酒吧打印机

谢谢

Answer 1

将一个名为 LocalReportExtension.cs 的类添加到您的项目中：

    using Microsoft.Reporting.WinForms;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.IO;

public static class LocalReportExtensions
{
    public static void Print(this LocalReport report, string printerName)
    {
        var pageSettings = new PageSettings();
        pageSettings.PaperSize = report.GetDefaultPageSettings().PaperSize;
        pageSettings.Landscape = report.GetDefaultPageSettings().IsLandscape;
        pageSettings.Margins = report.GetDefaultPageSettings().Margins;
        Print(report, pageSettings, printerName);
    }

    public static void Print(this LocalReport report, PageSettings pageSettings, string printerName)
    {
        string deviceInfo =
            $@"<DeviceInfo>
                <OutputFormat>EMF</OutputFormat>
                <PageWidth>{pageSettings.PaperSize.Width * 100}in</PageWidth>
                <PageHeight>{pageSettings.PaperSize.Height * 100}in</PageHeight>
                <MarginTop>{pageSettings.Margins.Top * 100}in</MarginTop>
                <MarginLeft>{pageSettings.Margins.Left * 100}in</MarginLeft>
                <MarginRight>{pageSettings.Margins.Right * 100}in</MarginRight>
                <MarginBottom>{pageSettings.Margins.Bottom * 100}in</MarginBottom>
            </DeviceInfo>";

        Warning[] warnings;
        var streams = new List<Stream>();
        var currentPageIndex = 0;

        report.Render("Image", deviceInfo,
            (name, fileNameExtension, encoding, mimeType, willSeek) =>
            {
                var stream = new MemoryStream();
                streams.Add(stream);
                return stream;
            }, out warnings);

        foreach (Stream stream in streams)
            stream.Position = 0;

        if (streams == null || streams.Count == 0)
            throw new Exception("Error: no stream to print.");

        var printDocument = new PrintDocument();
        printDocument.DefaultPageSettings = pageSettings;
        if (!printDocument.PrinterSettings.IsValid)
            throw new Exception("Error: cannot find the default printer.");
        else
        {
            printDocument.PrintPage += (sender, e) =>
            {
                Metafile pageImage = new Metafile(streams[currentPageIndex]);
                Rectangle adjustedRect = new Rectangle(
                    e.PageBounds.Left - (int)e.PageSettings.HardMarginX,
                    e.PageBounds.Top - (int)e.PageSettings.HardMarginY,
                    e.PageBounds.Width,
                    e.PageBounds.Height);
                e.Graphics.FillRectangle(Brushes.White, adjustedRect);
                e.Graphics.DrawImage(pageImage, adjustedRect);
                currentPageIndex++;
                e.HasMorePages = (currentPageIndex < streams.Count);
                e.Graphics.DrawRectangle(Pens.Red, adjustedRect);
            };
            printDocument.EndPrint += (Sender, e) =>
            {
                if (streams != null)
                {
                    foreach (Stream stream in streams)
                        stream.Close();
                    streams = null;
                }
            };
            printDocument.PrinterSettings.PrinterName = printerName;
            printDocument.Print();
        }
    }
}

然后像这样调用您的reportviewr（将打印机名称作为参数传递）：

this.reportViewer.LocalReport.Print("\\YourServer\YourPrinterName");