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qListView ezEdit Display Fields edit screen error “httpvaluecollection.throwifmaxhttpcollectionkeysexceeded()” when accessing a list with large #’s of columns.

Title

qListView ezEdit Display Fields edit screen error “httpvaluecollection.throwifmaxhttpcollectionkeysexceeded()” when accessing a list with large #’s of columns.

Description

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When trying to edit a list through EZEdit that has a lot of columns you get an Correlation ID error after clicking OK or Cancel.

Cause

The MaxHttpCollectionKeys limit is being reached. Even though the columns are under the limit, QuickApps webparts provide more advanced features than the native SP webparts, QuickApps webparts require more parameters on the web form than the native SP webparts in order to provide this advanced functionality. This is why the native SP webparts can still work when QuickApps webparts begin to have this problem. 

Resolution

There are two workarounds for this issue:
1. Increasing the MaxHttpCollectionKeys value temporarily and then change it back after finishing the configuration. (does not require an IISReset). This value can be set in the web.config file.
The setting in the web.config looks like this:
<appSettings>
      <add key="aspnet:MaxHttpCollectionKeys" value="2000" />
</appSettings>
Where 2000 can be set to a number that works for your environment. Default it 1000.
or
2.Write the XML configuration manually 

Defect ID

The MaxHttpCollectionKeys limit is being reached. Even though the columns are under the limit, QuickApps webparts provide more advanced features than the native SP webparts, QuickApps webparts require more parameters on the web form than the native SP webparts in order to provide this advanced functionality. This is why the native SP webparts can still work when QuickApps webparts begin to have this problem. 

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