"The path is not of a legal form." error message on processing a Telerik Report in a project targeting .NET 4.6.2 framework

RELATED TO:

AUTHOR: Stephania Tapela

DATE MODIFIED : April 25, 2018

DATE POSTED: June 16, 2017

Article information

Article relates to

Telerik Reporting,
.NET 4.6.2

Created by

Stef

Last modified

June 16, 2016

Last modified by

Stef

PROBLEM
"The path is not of a legal form." error message on processing a Telerik Report in a project targeting .NET 4.6.2 framework.

The Exception occurs on processing a Telerik Report that contains a resourced specified by file path e.g. ='C:\Pictures\MyImage.png.' used as PictureBox.Value property.

The stack trace looks as follows:
An exception has occurred while processing 'pictureBox' item:
System.InvalidOperationException: Invalid image data. ---> System.ArgumentException: The path is not of a legal form.
   at System.IO.Path.NewNormalizePathLimitedChecks(String path, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.InternalGetDirectoryName(String path)
   at Telerik.Reporting.Processing.Imaging.ImageUtils.ResolveBasePath()
   at Telerik.Reporting.Processing.Imaging.ImageUtils.GetImageData(Object value)
   --- End of inner exception stack trace ---
   at Telerik.Reporting.Processing.Imaging.ImageUtils.GetImageData(Object value)
   at Telerik.Reporting.Processing.Imaging.ImageDataHelper.StoreImageData(Object key, Object value, IImageInfoMap imageInfoMap, ICache cache, String& imageDataKey)
   at Telerik.Reporting.Processing.PictureBox.ResolveImage(Object value)
   at Telerik.Reporting.Processing.PictureBox.ProcessItem()
   at Telerik.Reporting.Processing.ReportItemBase.ProcessElement()
   at Telerik.Reporting.Processing.ProcessingElement.Process(IDataMember dataContext)


SOLUTION
Add the following setting in the running application's configuration file, in the runtime section:
<runtime>
        <AppContextSwitchOverrides value="Switch.System.IO.UseLegacyPathHandling=true" /> 
</runtime>
The setting will be applied only to the running application. It lets file paths to be specified as before .NET 4.6.2 framework without getting System.ArgumentException.

For more details, please check AppContext Class (msdn).

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