我需要帮助动态地在ReportViewer中添加图像徽标。我从数据库获取该图像,将其转换为Base64,然后我需要将其添加到的ReportViewer ...接下来这段代码:如何动态地将图片徽标添加到ReportViewer参数?
rpViewer.LocalReport.EnableExternalImages = true;
Company _company = db.Companys.Where(c => c.codCompany == c.codCompany).Single();
//first step
byte[] img = _company.imagem.ToArray(); // i get image from db
MemoryStream _ms = new MemoryStream(img);
string logo = Convert.ToBase64String(img); //convert to base64
// 2 step
List<ReportParameter> lstReportParams = new List<ReportParameter>();//Create params
lstReportParams.Add(new ReportParameter("Logo", logo));
lstReportParams.Add(new ReportParameter("LogoMimeType", "image/png"));
// Doesn't work here (see error below)
this.rpViewer.LocalReport.SetParameters(lstReportParams);
this.rpViewer.RefreshReport();
错误:
{"An error occurred during local report processing."}
{"An attempt was made to set a report parameter 'Logo' that is not defined in this report."}
在Rldc:
MIMEType =Parameters!LogoMimeType.value
Value ="System.Convert.FromBase64String(Parameters!Logo.Value)"
它为什么不起作用?
为什么不识别参数?
我可以在ReportViewer中加载该图像。
嗨, 我需要拍一张db中的图片,这是公司的标志,并在报告中显示。 RLDC中的这个参数可以吗? MIMEType =参数!LogoMimeType.value值 Value =“System.Convert.FromBase64String(Parameters!Logo.Value)” 谢谢.. – user95542 2009-07-19 16:39:24