还有没有人知道一个.NET C＃库中的WinForms和Microsoft服务报告显示CGM文件/ CrystalReports，使其打印呢？

Does any one knows a .NET C# library for displaying CGM files in WinForms and Microsoft Service Reports/CrystalReports so that it is printable as well?

这也将是非常有帮助的，如果它也可以将文件转换为如JPEG，GIF，PNG等。

It would also be extremely helpful if it is also be able to convert the file to a web-frendly graphics format like jpeg, gif, png etc..

这可能是一个重复的问题，从 .NET库CGM文件转换但OP没有标注答案，也不是建议的解决方案.NET兼容。

This is likely a repeated question from .NET Library for CGM File Conversion but that OP did not mark an answer nor were the suggested solutions .NET compatible.

所以，我只是重新尝试我的运气。感谢您的帮助。

So I am just trying my luck again. Thanks for helping.

推荐答案

我只是想和SO分享这个临时的黑客。我还需要一个正确的库如果可能的话（幸得大家谁使.NET的Excel教程在网上提供）：

I just want to share this temporary hack with SO. I still need a proper library if possible (Credit goes to everyone who makes .NET excel tutorials available online):

using System;
using Excel = Microsoft.Office.Interop.Excel;
using Microsoft.Office.Core;
using System.Drawing;

namespace CGM

{
    public class CGMConverter 
    {
        Image _mImage;

        public Image Image { get { return _mImage; } }

        public CGMConverter(string cgm, float width, float height)
        {
            object misValue = System.Reflection.Missing.Value;
            Excel.Application xlsApp = null;
            Excel.Workbook xlsWorkBook = null;
            Excel.Worksheet xlsWorkSheet = null;

            try
            {
                xlsApp = new Excel.ApplicationClass();
                xlsWorkBook = xlsApp.Workbooks.Add(misValue);
                xlsWorkSheet = (Excel.Worksheet)xlsWorkBook.Sheets["sheet1"];
                xlsWorkSheet.Shapes.AddPicture(cgm, MsoTriState.msoFalse, MsoTriState.msoTrue, 50, 50, width, height);
                xlsWorkSheet.Shapes.Item(0).Copy();
                _mImage = System.Windows.Forms.Clipboard.GetImage();
            }
            catch(Exception e)
            {
                throw (e);
            }
            finally
            {
                xlsApp.DisplayAlerts = false;
                xlsApp.Quit();
                releaseObject(xlsWorkSheet);
                releaseObject(xlsWorkBook);
                releaseObject(xlsApp);
            }
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
            }
            finally
            {
                GC.Collect();
            }
        }
    }
}