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我在渲染 SSRS 服务器报告并从代码中打印它时遇到了困难。

尽管渲染成功并打印了报告,但图形质量的结果很差。该报告本身具有用于徽标的高分辨率 6kx1k GIF 图像。

我制作了下面的图片来说明使用 EMF 与 PDF 进行渲染之间的区别:

(左侧为 PDF,右侧为 EMF)

如您所见,字体看起来很棒(没有像素化),并且在 PDF 徽标中呈现时看起来不错。但是 EMF 版本的质量很差,正如您在徽标边缘看到的那样。

有人遇到过这个并解决了吗?

我正在运行 SQL Server 2008R2 SP2 (10.50.4000)

使用 EMF 呈现报告的代码

public List<byte[]> Render()
{
    // Setting credentials and reporting services uri
    ReportExecutionService reportService = new ReportExecutionService
        {
            Credentials = _credentials,
            Url = Settings.Default.ReportingService
        };

    // Prepare report parameter.
    ExecutionHeader execHeader = new ExecutionHeader();
    reportService.ExecutionHeaderValue = execHeader;
    reportService.LoadReport(_report, null);
    reportService.SetExecutionParameters(_parameters.ToArray(), "en-us");

    // Render
    bool startup = true;
    List<byte[]> streams = new List<byte[]>();
    int numberOfPages = 0;
    byte[] result = null;
    while (startup || result.Length > 0)
    {
        startup = false;
        string devInfo = String.Format(@"<DeviceInfo><OutputFormat>EMF</OutputFormat><PrintDpiX>150</PrintDpiX><PrintDpiY>150</PrintDpiY><StartPage>{0}</StartPage></DeviceInfo>", numberOfPages + 1);
        string encoding, mimeType, extension;
        string[] streamIDs = null;
        Warning[] warnings = null;
        result = reportService.Render("IMAGE", devInfo, out extension, out encoding, out mimeType, out warnings, out streamIDs);

        if (result.Length > 0)
        {
            streams.Add(result);
        }
        numberOfPages++;
    }
    return streams;
}

这是打印文档的实现

public class PrintReport : PrintDocument
{
    private int _currentPage;
    private  List<byte[]> _pages;

    public PrintReport()
    {
    }

    public List<byte[]> Pages
    {
        get { return _pages; }
        set { _pages = value; }
    }

    protected override void OnBeginPrint(PrintEventArgs e)
    {
        base.OnBeginPrint(e);
        _currentPage = 0;
    }

    protected override void OnPrintPage(PrintPageEventArgs e)
    {
        base.OnPrintPage(e);

        Stream pageToPrint = new MemoryStream(_pages[_currentPage]);
        pageToPrint.Position = 0;

        // Load each page into a Metafile to draw it.
        using (Metafile pageMetaFile = new Metafile(pageToPrint))
        {
            Rectangle adjustedRect = new Rectangle(
                    e.PageBounds.Left - (int)e.PageSettings.HardMarginX,
                    e.PageBounds.Top - (int)e.PageSettings.HardMarginY,
                    e.PageBounds.Width,
                    e.PageBounds.Height);

            // Draw a white background for the report
            e.Graphics.FillRectangle(Brushes.White, adjustedRect);

            // Draw the report content
            e.Graphics.DrawImage(pageMetaFile, adjustedRect);

            // Prepare for next page.  Make sure we haven't hit the end.
            _currentPage++;
            e.HasMorePages = _currentPage < _pages.Count;
        }
    }

    protected override void OnQueryPageSettings(QueryPageSettingsEventArgs e)
    {
        e.PageSettings = (PageSettings)PrinterSettings.DefaultPageSettings.Clone();
    }
}
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1 回答 1

0

尝试用下面从 devInfo 复制的片段中的所需 dpi 替换“150”,它应该会有所帮助。将其更改为“300”解决了我的类似问题。

<PrintDpiX>150</PrintDpiX><PrintDpiY>150</PrintDpiY>

请注意,在您的报告中更改这一点可能会令人沮丧,因为报告查看器渲染引擎在预览报告时仍会以 150 dpi 显示,因此您需要在每次更新 rdl 后使用您的代码测试您的布局。

于 2022-02-16T17:31:21.817 回答