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CAD .NET一款在CAD领域被广泛应用的控件，可以快速准确的阅读DWG和DXF文件，并且通过Windows GDI+方法绘制件，支持多种文件格式，包括DWG、DXF、Gerber、光栅图像等，并支持部分编辑功能。

CAD .NET本身就是一款快捷方便的CAD文档浏览转换控件，为了让大家更快上手使用，小编为大家整理了CAD .NET基础操作指南，希望对大家有所帮助。

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• 读取DWG文件

   using CADImport;
   using CADImport.DWG;
   using CADImport.DXF;
   using CADImport.RasterImage;                   
  

   private void Read_DWG_Click(object sender, EventArgs e)
          {
              //DWGImage class is used only for reading DWG. To read other
  formatsuse the corresponding classes. 
              //E.g. for DXF: CADImage class, for PLT/HPGL: HPGLImage class.
              DWGImage vDrawing = new DWGImage();
              vDrawing.LoadFromFile(@"..\..\..\Files\Gasket.dwg");
              vDrawing.Draw(Image1.CreateGraphics(), new RectangleF(0, 0,
  (float)vDrawing.AbsWidth, (float)vDrawing.AbsHeight));
              // zooming and panning of the drawing are implemented in the demo
  Viewer
              // via a special viewing control class CADPictureBox
          }  

• 加载文档

   using CADImport;
   using CADImport.DWG;
   using CADImport.DXF;
   using CADImport.RasterImage;                   
  

     private void Load_file_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);
              // adjusting of the visualization sizes to the control area:
              RectangleF vRect;
              double vRatio = (double)(vDrawing.AbsHeight * Image1.ClientSize.Width)
  / (vDrawing.AbsWidth * Image1.ClientSize.Height);
              if (vRatio > 1)
                  vRect = new RectangleF(0, 0, (float)(Image1.ClientSize.Width /
  vRatio), (float)Image1.ClientSize.Height);
              else
                  vRect = new RectangleF(0, 0, (float)Image1.ClientSize.Width,
  (float)(Image1.ClientSize.Height * vRatio));
              //-----------------------------------------------
              vDrawing.Draw(Image1.CreateGraphics(), vRect);
          }                    
   

• 存取线条

   using CADImport;
   using CADImport.DWG;
   using CADImport.DXF;
   using CADImport.RasterImage;                   
  

   private void Access_line_data_Click(object sender, EventArgs e)
  {
      //CADImage.CreateImageByExtension detects format with 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(@"..\..\..\Files\Entities.dxf");
      vDrawing.LoadFromFile(@"..\..\..\Files\Entities.dxf");
   
      for (int i = 0; i < vDrawing.CurrentLayout.Count; i++) { if (vDrawing.CurrentLayout.Entities[i].EntType == EntityType.Line) { CADLine vLine = (CADLine)vDrawing.CurrentLayout.Entities[i]; MessageBox.Show("Line is found. Handle = " + vLine.Handle + "; X: " + vLine.Point.X + "; Y: " + vLine.Point.Y + "; X1: " + vLine.Point1.X + "; Y1: " + vLine.Point1.Y); break; } } } 

• 换层

   using CADImport;
   using CADImport.DWG;
   using CADImport.DXF;
   using CADImport.RasterImage;                   
  

  private void Change_layers_Click(object sender, EventArgs e)
  {
      //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(@"..\..\..\Files\Entities.dxf");
      vDrawing.LoadFromFile(@"..\..\..\Files\Entities.dxf");
      // Changes color for Layer '0'
      vDrawing.Converter.LayerByName("0").Color = Color.Red;
      // If Layer2 doesn't exist, it will be created
      CADLayer vLayer = vDrawing.Converter.LayerByName("Layer2");
      vLayer.Visible = false; //Changes layer visibility
      // Adjusting visualization sizes to the control area:
      RectangleF vRect;
      double vRatio = (double)(vDrawing.AbsHeight * Image1.ClientSize.Width) / (vDrawing.AbsWidth * Image1.ClientSize.Height);
      if (vRatio > 1)
          vRect = new RectangleF(0, 0, (float)(Image1.ClientSize.Width / vRatio), (float)Image1.ClientSize.Height);
      else
          vRect = new RectangleF(0, 0, (float)Image1.ClientSize.Width, (float)(Image1.ClientSize.Height * vRatio));
      //-----------------------------------------------
      vDrawing.Draw(Image1.CreateGraphics(), vRect);
  }                                 
   

• 添加，更改，删除

   ... 
   using CADImport;
   using CADImport.DWG;
   using CADImport.DXF;
   using CADImport.RasterImage;
   ...
    
    
           private void Add_change_delete_Click(object sender, EventArgs e)
           {
               //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(@"..\..\..\Files\Entities.dxf");
               vDrawing.LoadFromFile(@"..\..\..\Files\Entities.dxf");
               // Changes color
               vDrawing.CurrentLayout.Entities[1].Color = Color.Blue;
               vDrawing.CurrentLayout.Entities[1].LineWeight = 2;
               vDrawing.Converter.Loads(vDrawing.CurrentLayout.Entities[1]);
               //Removes the circle entity from the Entities.dxf drawing
               vDrawing.CurrentLayout.Entities.RemoveAt(2);
               // Creating a new entity - line
               CADLine vLine = new CADLine();
               vLine.Point = new DPoint(50, 0, 0);
               vLine.Point1 = new DPoint(50, 70, 10);
               vLine.LineWeight = 1;
               vDrawing.Converter.Loads(vLine);
               vDrawing.CurrentLayout.AddEntity(vLine);
               // Recalculates the extents of the drawing
               vDrawing.GetExtents();
               // Adjusting visualization sizes to the control area:
               RectangleF vRect;
               double vRatio = (double)(vDrawing.AbsHeight * Image1.ClientSize.Width) / (vDrawing.AbsWidth * Image1.ClientSize.Height);
               if (vRatio > 1)
                   vRect = new RectangleF(0, 0, (float)(Image1.ClientSize.Width / vRatio), (float)Image1.ClientSize.Height);
               else
                   vRect = new RectangleF(0, 0, (float)Image1.ClientSize.Width, (float)(Image1.ClientSize.Height * vRatio));
               //-----------------------------------------------
               vDrawing.Draw(Image1.CreateGraphics(), vRect);
           }                                 
   

• CAD转换为BMP

  ... 
   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);
           }                                     
   

• 查找块

  ... 
   using CADImport;
   using CADImport.DWG;
   using CADImport.DXF;
   using CADImport.RasterImage;
   ...
    
           private void Find_block_Click(object sender, EventArgs e)
           {
               //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(@"..\..\..\Files\Entities.dxf");
               vDrawing.LoadFromFile(@"..\..\..\Files\Entities.dxf");
    
               string BlockName = "Block1"; //The block name is Block1
               for (int i = 0; i < vDrawing.Converter.Blocks.Count; i++) if (((CADBlock)vDrawing.Converter.Blocks[i]).Name.ToLower() == BlockName.ToLower()) { //found MessageBox.Show("Block with name '" + BlockName + "' has found.\nIndex of the block is " + i); break; } }