Adding Web.config schema validation to the Configuration Manager

[daguiler]

Fixes #4706

Summary

Adding Web.config schema validation to the Configuration Manager. Other config files and non-XML files are ignored.

When user clicks on the Save Changes button, the file is sent to the server for validation. If the file is the Web.config file, the server validates its contents against the DotNetConfig.xsd schema, and returns a list of validation errors. Or an empty list if no errors are found.

The browser then presents a summary of the validation errors in a popup window, and asks the user whether to continue the save operation or cancel.

I'm adding the DotNetConfig.xsd file as an embedded resource. Maybe in the future we can add more XSD files to validate other config files.

Also, I added a new unit tests project to cover this change.

Screenshots

• Good schema, no validation errors, normal save:

• Valid XML, bad schema:

• More than 5 validation errors:

• Bad XML:

[bdukes]

LGTM, thanks!

[valadas]

This is an awesome improvement! Thanks @bdukes