VB.net linq。包含在XML列上

Question

I have a database with one XML column named Results. This column contains results from factory testing and different XML formatting depending on which test was performed.

I'm developing a GUI where I can browse my results so I need to filter this column dynamically.

My first idea was to use Results.contains("myfilter") but this does not seem to work.

I am using Visual Studio 2015 with linq and entities.

This is my query:

Using context As New Entities
    Dim query = From tr In context.TestResults
                Join t In context.Tests On a Equals tr.Tests
                Join ts In context.TestStations On ts Equals tr.TestStations
                Join ut In context.UnitTraveler On ut Equals tr.UnitTraveler
                Where t.Id = TestID
                Where ts.Id = TestStationID
                Where tr.Results.Contains("TestCurrent")
                Take Count
                Select ut.SerialNumber, ut.ModelString, ut.Passed, tr.Results, tr.StartedOn, tr.EndedOn
                Order By StartedOn Descending
End Using

Update 2015-12-01: I still haven't found a solution to this. Does anyone have an idea?

Answer 1

If the Results property is of type String and you search inside this string for a specific substring you can use this:

query = (From tr In ... Where tr.Results Like "*TestCurrent*")

If Results it is a collection or List

query = (From tr In ... Where tr.Results.Find(Function(f As Result) f.Contents Like "*TestCurrent*") IsNot Nothing)

Please change the used words Result and Contents according to your Classnames and Properties.