CODEWITHSUNDEEP
c#winformsbase64reportrdlc
th3l0n3r4n93r
th3l0n3r4n93r

Reputation: 105

C# Base64 string can convert to image but not showing in .rdlc Image controls

I used a library to generate Barcode Bitmap and then convert this to Base64 string. This string works ok, I can convert it back to Image in all online tools I found. But when I put it on an Image control in RDLC report by Convert.FromBase64String(), the Image not showing at all.

Here is my base64 string (Base64Barcode in _sticker instant)

Then I pass this string to my ReportViewer (connected with my .rdlc report)

private void FormPreview_Load(object sender, EventArgs e)
{
    ReportParameter[] parameters = new ReportParameter[]
    {
        new ReportParameter("palletNo", _sticker.PalletNo)              
        new ReportParameter("qrBase64", _sticker.Base64QR, true),
        new ReportParameter("barcodeBase64", _sticker.Base64Barcode, true)
    };

    this.reportViewer.LocalReport.SetParameters(parameters);
    this.reportViewer.RefreshReport();
}

In .rdlc I create an Image control and set the field "Use this image" to:

=Convert.FromBase64String(Parameters!barcodeBase64.Value)

The TextBox control works fine. But Image controls do not show anything but a white little box with a red X inside.

I've found many solutions on the internet but none of them seems works to me. Is there something that I missed?

I use Visual Studio 2019 Community, .NET Framework 4.5, ZXing library 0.16.4.0, Microsoft.ReportViewer.WinForms 14.0.0.0

Thanks.

Upvotes: 2

Views: 4576

Answers (1)

Reza Aghaei
Reza Aghaei

Reputation: 125197

To show a Base64 string as image in the RDLC report, using report designer:

  • Drop an Image report control from toolbox.
  • Right click on the image and choose Image Properties
  • Set the image source to Database
  • Set the MIME type to a suitable value, for example image/bmp.
  • Set use this field to the image parameter which you have, for example =Parameters!MyImage.Value. The parameter type should be Text.

Then at run-time, assign the Base64 string as value of the parameter.

Note: When the image source is set to External, the value of the parameter should set to an absolute URL and the LocalReport.EnableExternalImages property of the report viewer should be set to true.

Upvotes: 5

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