如何从 Web 服务打印 HTML 文档? [英] How do I print an HTML document from a web service?

问题描述

我想从 C# 网络服务打印 HTML.Web 浏览器控件是过大的，在服务环境中不能很好地运行，在安全约束非常严格的系统中也不能很好地运行.是否有任何类型的免费 .NET 库支持打印基本的 HTML 页面?这是我到目前为止的代码，它运行不正常.

I want to print HTML from a C# web service. The web browser control is overkill, and does not function well in a service environment, nor does it function well on a system with very tight security constraints. Is there any sort of free .NET library that will support the printing of a basic HTML page? Here is the code I have so far, which does not run properly.

public void PrintThing(string document)
{
    if (Thread.CurrentThread.GetApartmentState() != ApartmentState.STA)
    {
        Thread thread =
            new Thread((ThreadStart) delegate { PrintDocument(document); });
        thread.SetApartmentState(ApartmentState.STA);
        thread.Start();
    }
    else
    {
        PrintDocument(document);
    }
}

protected void PrintDocument(string document)
{
    WebBrowser browser = new WebBrowser();
    browser.DocumentText = document;
    while (browser.ReadyState != WebBrowserReadyState.Complete)
    {
        Application.DoEvents();
    }
    browser.Print();
}

这在从 UI 类型线程调用时工作正常，但从服务类型线程调用时没有任何反应.将 Print() 更改为 ShowPrintPreviewDialog() 会产生以下 IE 脚本错误:

This works fine when called from UI-type threads, but nothing happens when called from a service-type thread. Changing Print() to ShowPrintPreviewDialog() yields the following IE script error:

错误: dialogArguments.___IE_PrintType 为空或不是对象.

网址:res://ieframe.dll/preview.dlg

出现一个小的空打印预览对话框.

And a small empty print preview dialog appears.

推荐答案

您可以使用以下命令从命令行打印:

You can print from the command line using the following:

rundll32.exe%WINDIR%System32mshtml.dll,PrintHTML%1"

rundll32.exe %WINDIR%System32mshtml.dll,PrintHTML "%1"

其中 %1 是要打印的 HTML 文件的文件路径.

Where %1 is the file path of the HTML file to be printed.

如果您不需要从内存中打印(或者可以在临时文件中写入磁盘)，您可以使用:

If you don't need to print from memory (or can afford to write to the disk in a temp file) you can use:

using (Process printProcess = new Process())
{
    string systemPath = Environment.GetFolderPath(Environment.SpecialFolder.System);
    printProcess.StartInfo.FileName = systemPath + @"
undll32.exe";
    printProcess.StartInfo.Arguments = systemPath + @"mshtml.dll,PrintHTML """ + fileToPrint + @"""";
    printProcess.Start();
}

注意我认为这仅适用于 Windows 2000 及更高版本.

N.B. This only works on Windows 2000 and above I think.

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