net35;net40;net45;net451;net452;net46;net461;net462;net47;net471;net472;net48;
netstandard2.0;netcoreapp3.1;
net5.0;net6.0;

OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";
if (ofd.ShowDialog() != DialogResult.OK) return;
var imagebyte = File.ReadAllBytes(ofd.FileName);
 Bitmap bitmap = new Bitmap(new MemoryStream(imagebyte));

 //自带轻量版中英文模型PP-OCRv3
 // OCRModelConfig config = null;

 //服务器中英文模型
 //OCRModelConfig config = new OCRModelConfig();
 //string root = Environment.CurrentDirectory;
 //string modelPathroot = root + @"\inferenceserver";
 //config.det_infer = modelPathroot + @"\ch_ppocr_server_v2.0_det_infer";
 //config.cls_infer = modelPathroot + @"\ch_ppocr_mobile_v2.0_cls_infer";
 //config.rec_infer = modelPathroot + @"\ch_ppocr_server_v2.0_rec_infer";
 //config.keys = modelPathroot + @"\ppocr_keys.txt";

 //英文和数字模型
 OCRModelConfig config = new OCRModelConfig();
 string root = Environment.CurrentDirectory;
 string modelPathroot = root + @"\en";
 config.det_infer = modelPathroot + @"\ch_PP-OCRv2_det_infer";
 config.cls_infer = modelPathroot + @"\ch_ppocr_mobile_v2.0_cls_infer";
 config.rec_infer = modelPathroot + @"\en_number_mobile_v2.0_rec_infer";
 config.keys = modelPathroot + @"\en_dict.txt";


 OCRParameter oCRParameter = new  OCRParameter ();
 OCRResult ocrResult = new OCRResult();

//建议程序全局初始化一次即可，不必每次识别都初始化，容易报错。  
 PaddleOCREngine engine = new PaddleOCREngine(config, oCRParameter);
  {
    ocrResult = engine.DetectText(bitmap );
  }
 if (ocrResult != null)
 {
    MessageBox.Show(ocrResult.Text,"识别结果");
 }

//不再用OCR时，请把PaddleOCREngine释放

PaddleOCR                    //PaddleOCR.dll文件的源代码文件夹
|--cpp                       //PaddleOCR.dll的Cpp文件
|--include                   //PaddleOCR.dll的.h文件

PaddleOCRLib                 //OCR运行需要的文件
|--inference                 //OCR的轻量中文简体模型库
|--libiomp5md.dll            //第三方引用库
|--mkldnn.dll                //第三方引用库
|--mklml.dll                 //第三方引用库
|--opencv_world411.dll       //第三方引用库
|--paddle_inference.dll      //飞桨库
|--PaddleOCR.dll             //基于开源项目PaddleOCR修改的C++动态库，源码见根目录下的PaddleOCR文件夹 
PaddleOCRSharp               //.NET封装库项目
PaddleOCRDemo                //Demo文件夹
|--Cpp                       //C++项目需要引用的PaddleOCR.dll的头文件和库文件
|--PaddleOCRCppDemo          //C++调用示例项目
|--PaddleOCRSharpDemo        //.NET调用示例项目
|--WebAPIDemo                //.NET的WebAPI示例项目

 <TargetFrameworks>
net35;net40;net45;net451;net452;net46;net461;net462;net47;net471;net472;net48;
netstandard2.0;netcoreapp3.1;
net5.0;net6.0;
</TargetFrameworks>

  OpenFileDialog ofd = new OpenFileDialog();
  ofd.Filter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";
  if (ofd.ShowDialog() != DialogResult.OK) return;
  var imagebyte = File.ReadAllBytes(ofd.FileName);
  Bitmap bitmap = new Bitmap(new MemoryStream(imagebyte));
  OCRModelConfig config = null;
  OCRParameter oCRParameter = new  OCRParameter ();

  OCRResult ocrResult = new OCRResult();

  //建议程序全局初始化一次即可，不必每次识别都初始化，容易报错。     
  PaddleOCREngine engine = new PaddleOCREngine(config, oCRParameter);
   {
    ocrResult = engine.DetectText(bitmap );
   }
 if (ocrResult != null)
 {
    MessageBox.Show(ocrResult.Text,"识别结果");
 }