利用FastReport传递图片参数在报表上展示签名信息的实现方法

namespace FastReport
{
  public class ReportScript
  {

    private void shopDoctorImg_BeforePrint(object sender, EventArgs e)
    {
      var img = GetImage("ShopDoctor");
      if(img != null){
        shopDoctorImg.Image=img;  
      }
    }   
    private void tiaopeiImg_BeforePrint(object sender, EventArgs e)
    {    
      var img = GetImage("Tiaopei");
      if(img != null){
        tiaopeiImg.Image=img;  
      }
    }       

    private void CheckDoctorImg_BeforePrint(object sender, EventArgs e)
    {
      var img = GetImage("CheckDoctor");
      if(img != null){
        CheckDoctorImg.Image=img;  
      }
    }

    private void CheckPharMacistImg_BeforePrint(object sender, EventArgs e)
    {       
      var img = GetImage("CheckPharmacist");
      if(img != null){
        CheckPharmacistImg.Image=img;  
      }
    }
    private Image GetImage(string signName)
    {         
      Image img = null;
      string imgStr = (string)Report.GetParameterValue(signName);
      if(!string.IsNullOrEmpty(imgStr))
      {
        byte[] imgData= Convert.FromBase64String(imgStr);
        using(MemoryStream ms = new MemoryStream(imgData))
        {
          img = System.Drawing.Image.FromStream(ms);            
        }
      }
      return img;
    }
        
  }
}

//通过姓名获取签名图片的Base64
        private string GetSignImage(string signName)
        {
            var result = "";
            string imagePath = Path.Combine(baseDir, $"Report/signs/{signName}.png");
            if (File.Exists(imagePath))
            {
                var stream = FileUtil.FileToStream(imagePath);
                var image = FileUtil.StreamToBytes(stream);
                if (image != null)
                {
                    result = Convert.ToBase64String(image);
                }
            }
            return result;
        }

//生成pdf报表文档到具体文件
    Report report = new Report();
    report.Load(reportFile);

    //定义参数和数据格式
    var dict = new Dictionary<string, object>();
    #region 测试数据源
    dict.Add("Name", "张三");
    dict.Add("Gender", "男");
    dict.Add("Age", 32);
    dict.Add("Telephone", "18620292076");
    dict.Add("CreateTime", "2019-10-13 22:30:15");
    dict.Add("CheckDoctor", GetSignImage("张医生"));//"张医生"
    dict.Add("CheckPharmacist", GetSignImage("张医生")); //"李药师"
    dict.Add("SendUser", "王小姐");
    dict.Add("QrCode", "Http://www.iqidi.com");
    dict.Add("BarCode", "1234567890");

    //图片文件
    dict.Add("ShopDoctor", GetSignImage("张医生"));
    dict.Add("Tiaopei", GetSignImage("张医生"));
    dict.Add("Fayao", GetSignImage("王小姐"));    
    #endregion
    
    report.ReGISterData(dt, "Detail");
    foreach (string key in dict.Keys)
    {
        report.SetParameterValue(key, dict[key]);
    }

    //运行报表
    report.Prepare();

//运行报表
    report.Prepare();    
    
    //导出PDF报表
    //PDFExport export = new PDFExport();

    //多个图片导出
    int count = 1;
    string firstFileName = exportImgPath.Replace(".png", "");
    foreach (PageBase item in report.Pages)
    {
        string fileName = string.FORMat("{0}_{1}.png", firstFileName,  count);
        exportImgPath = fileName;
        //Resolution= 300可以提高分辨率
        report.Export(new ImageExport() { PageRange = PageRange.Current, CurPage = count, Resolution= 300 }, fileName);
        count++;
    }