Throw Execptions in DocumentFormatProvidersManager

[gao]

I had this problem with codes below:
The system caught this execption: (System.ArgumentException:. Has been added with the same key entry)
:
 System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
 System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
System.Collections.Generic.Dictionary`2.System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Add(KeyValuePair`2 keyValuePair)
 Telerik.Windows.Documents.FormatProviders.DocumentFormatProvidersManager.RegisterFormatProvider(IDocumentFormatProvider provider)
 ProjectManagePlatform.UI.Common.ExamplesFormatProvidersManager.RegisterFormatProviders()}

When the system runs in if{} shown below, it throws the execption.

Codes Below:
using Telerik.Windows.Documents.FormatProviders;
using Telerik.Windows.Documents.FormatProviders.Html;
using Telerik.Windows.Documents.FormatProviders.OpenXml.Docx;
using Telerik.Windows.Documents.FormatProviders.Pdf;
using Telerik.Windows.Documents.FormatProviders.Txt;
using Telerik.Windows.Documents.FormatProviders.Xaml;

public static class ExamplesFormatProvidersManager
    {
        private static bool isRegistered = false;

        /// <summary>
        /// This method is used only to work around limitations for using MEF in Examples.
        /// </summary>
        public static void RegisterFormatProviders()
        {
            if (!isRegistered)
            {
                DocumentFormatProvidersManager.RegisterFormatProvider(new XamlFormatProvider());
                DocumentFormatProvidersManager.RegisterFormatProvider(new HtmlFormatProvider());
                DocumentFormatProvidersManager.RegisterFormatProvider(new DocxFormatProvider());
                DocumentFormatProvidersManager.RegisterFormatProvider(new TxtFormatProvider());
                DocumentFormatProvidersManager.RegisterFormatProvider(new PdfFormatProvider());

                isRegistered = true;
            }
        }
    }

[Iva Toteva]

Hello Gao,

By default, the format providers are loaded through MEF, so you don't need to register them. As the summary of the method says, the RegisterFormatProvider method is used only in the cases when MEF does not work, e.g. when library caching is enabled.
If you are not using library caching, you can just skip this registration. The other solution would be to check explicitly if the format providers have been loaded (using the DocumentFormatProvidersManager.FormatProviders property), but that is hardly necessary.

Kind regards,
Iva
the Telerik team

[Roberto Pantalena]

Hi, I need to simulate the example of TelerikEditor and if i write this line like in the example, it doesen't work

 ExamplesFormatProvidersManager.RegisterFormatProviders(); 
 
I think because I use prism..Is there a way to implement this with prism? (if i remove this line of code it works, but it doesen't open word, xaml and pdf documents)

[Iva Toteva]

Hi Roberto,

From the ticket you opened, it turned out that the problem is due to the fact that you are using Prism and the assemblies containing the format providers were not referenced in the project where you are showing the view with RadRichTextBox.
Adding the references in the other project should have solved the issue. We will also make sure to update the documentation on this topic.

Regards,
Iva Toteva
the Telerik team