How to use scalar-valued function with linq to entity? [duplicate]

Answer 1

Here is how you do it:

Step 1: In edmx

      <Function Name="DistanceBetween" Aggregate="false" BuiltIn="false" NiladicFunction="false" IsComposable="false" ParameterTypeSemantics="AllowImplicitConversion" Schema="dbo">
      <CommandText>
        select dbo.DistanceBetween(@lat1,@long1,@lat2,@long2)
      </CommandText>
      <Parameter Name="Lat1" Type="real" Mode="In" />
      <Parameter Name="Long1" Type="real" Mode="In" />
      <Parameter Name="Lat2" Type="real" Mode="In" />
      <Parameter Name="Long2" Type="real" Mode="In" />
    </Function>

step 2: Import the function

1. double click the edmx
2. In the Model Browser view, expand GeoDataModel.Store (could be named different)
3. expand stored procedures /function
4. double click DistanceBetween
5. Scalars = Single
6. Click OK

Step 3: In C#:

    GeoDataEntities db = new GeoDataEntities();
    var first = db.DistanceBetween(234, 2342, 424, 243).First().Value;

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note that IsComposable="false" and no ReturnType and dont forget to add the :

      <CommandText>
        select dbo.DistanceBetween(@lat1,@long1,@lat2,@long2)
      </CommandText>

Hope that help....