我对RDLC报表功能很陌生,我想从SQL数据库中的产品数据生成标签。当用户打开ProductPart时,他们会看到这些信息。当用户点击按钮时,将打开报告,报告将把参数传递给报告,以便生成标签。
Dim myparam As ReportParameter
Dim testParameter As New List(Of ReportParameter)
myparam = New ReportParameter("PartID", "Test")
testParameter.Add(myparam)
myparam = New ReportParameter("MRPID", "Test MRP")
testParameter.Add(myparam)
myparam = New ReportParameter("PartName", "Test Name")
testParameter.Add(myparam)
ReportViewer1.LocalReport.SetParameters(testParameter)
Dim writer As New BarcodeWriter
writer.Format = BarcodeFormat.CODE_128
PictureBox1.Image = writer.Write(MRPID)
Me.ReportViewer1.RefreshReport()
正如您所看到的,我使用XLing来生成我的条形码,我已经成功地使用上面的3行代码来工作。然而,我不知道如何传递这个信息,或者在运行时在报表上生成这个信息。条形码将从MRPID生成,即(TV001232)。我知道这部分是错误的 "writer.Write(MRPID)",但我用MRPID替换了参数值,这样你就可以理解我想达到的目的。
先用这个把你的图片转换为Base64字符串。
Public Function ImageToBase64(ByVal image As Image, ByVal format As System.Drawing.Imaging.ImageFormat) As String
Dim base64String As String = ""
Using ms As New System.IO.MemoryStream()
image.Save(ms, format)
Dim imageBytes As Byte() = ms.ToArray()
base64String = Convert.ToBase64String(imageBytes)
End Using
Return base64String
End Function
所以这个
myparam = New ReportParameter("MRPID", "Test MRP")
testParameter.Add(myparam)
应该是这样的
Dim writer As New BarcodeWriter
writer.Format = BarcodeFormat.CODE_128
myparam = New ReportParameter("MRPID", ImageToBase64(writer.Write(MRPID),<THE IMAGE FORMAT OF YOUR IMAGE>))
testParameter.Add(myparam)
然后,在你的报告中设置以下内容:
MIMEType = select the correct MIME type from the dropdown list
Source = Database
Value = <Expression>
然后在表达式窗口中..:
=System.Convert.FromBase64String(Parameters!MRPID.Value)