Question

When Using LINQ to get information I use the following method

var salt_water_disposals = _SaltWaterDisposals.SaltWaterDisposals.Select(sw => new SaltWaterModel
            {

                saltwater_ID = sw.SaltWaterDisposalID,
                lease = sw.Lease.LeaseName,
                field = sw.Lease.Field.Name.ToLower(),
                permitter_fluid = sw.PermittedFluids.Count == 0 ? "None" : sw.PermittedFluids.Aggregate("", (current, c) => current+c.Fluid.Name),
                max_gas_pressure = sw.MaxGasInjectionPressure,

            });

However when I run the code I get the following error because of the PermittedFluids:

LINQ to Entities does not recognize the method ‘System.String
Aggregate[PermittedFluid,String](System.Collections.Generic.IEnumerable1[FieldPro.Domain.Entities.PermittedFluid],
System.String,
System.Func3[System.String,FieldPro.Domain.Entities.PermittedFluid,System.String])’
method, and this method cannot be translated into a store expression.

I have tried using it also as a ToString() but I get the same error.

Any Ideas?

Any Help would be appreciated.

Answer 1

I fixed this by taking out the Aggregate call and calling it in my view, and changing the data type or permitter_fluid.

So My model has:

public System.Data.Objects.DataClasses.EntityCollection<FieldPro.Domain.Entities.PermittedFluid> permitter_fluid { get; set; }

My Controller has:

permitter_fluid = sw.PermittedFluids,

and my view has (using a Html.Grid from MvCContrib):

column.For(m => m.permitter_fluid.Aggregate("", (current, c) => current + c.Fluid.Name)).Named("Permitted Fluid");

This solved my problem