CAD .NET是一款功能强大的CAD图形绘制、处理、导入和导出的.NET控件，支持多种CAD格式，可以通过代码或者可视化绘制CAD图形，并且可以导出绘制的CAD图形为多种其他文件格式，下面的代码讲述了如何将DWG文件格式转换为位图格式：

using CADImport; 

using CADImport.DWG; 

using CADImport.DXF; 

using CADImport.RasterImage; 

         private void CAD_to_BMP_Click(object sender, EventArgs e) 

         { 

             if ((OpenFileDialog1.ShowDialog() != DialogResult.OK)) return; 

             //CADImage.CreateImageByExtension detects format by the extension specified in the argument. 

             //The correct class for any supported format will be used automatically. We recommend to 

             //create a new drawing object with CADImage.CreateImageByExtension if import from the existed 

             //file/stream is required. 

             CADImage vDrawing = CADImage.CreateImageByExtension(OpenFileDialog1.FileName);

             vDrawing.LoadFromFile(OpenFileDialog1.FileName); 

             // The bitmap will have 1000 px width, height will be calulated automatically 

             Bitmap vBitmap = new Bitmap(1000, (int)(1000 * vDrawing.AbsHeight / vDrawing.AbsWidth)); 

             Graphics vGr = Graphics.FromImage(vBitmap); 

             RectangleF vRect = new RectangleF(0, 0, (float)1000, (float)(vBitmap.Width * vDrawing.AbsHeight / vDrawing.AbsWidth)); 

             vDrawing.Draw(vGr, vRect); 

             vBitmap.Save(OpenFileDialog1.FileName + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp); 

         }