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USDeveloperRob
 

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    1. This table or related slice is empty.
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    2. POAll MVC pages fail with the message an item with the same key has already been added
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    3. PORemove project from solution via Package Manager Console
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    1. This table or related slice is empty.
    1. COAbsolutely positive? No, but pretty close. The issue seems to be happening inside the System.Configuration assembly, which uses a NameValueCollection for appSettings. Because it happens deep inside the configuration system, I'm not sure how to apply your workaround. I have reviewed the System.Configuration code and it appears to handle concurrency, but I haven't eliminated all possibilities. Because the NameValueCollection is not thread safe, I can reproduce this with a contrived test and the stack trace mimics what we see above. I will post the code and stacktrace in another post.
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    2. CO@RodJohnson - The comparer is the 'ScopeStorageComparer', which is a wrapper around 'System.StringComparer' and 'System.Collections.Generic.EqualityComparer<T>'. As long as the 'key' and 'value' is a string, it will use the 'StringComparer' when evaluating equality. As far as it being a Dictionary<string,object>, I don't think it matters, but I have confirmed the MVC code is using 'Lazy<Dictionary<object, object>>'. As Mirko suggests below, I will try some threaded tests using both dictionary types and see if I can reproduce this.
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      1. POAll MVC pages fail with the message an item with the same key has already been added
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    3. COThank you Steve. Although I haven't fully investigated whether this is definitely our issue, but we are using an older version of Telerik controls and there has been no other reasonable answer. Thanks again.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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