Question

I have an Entity in my model which has an Enumeration type property.

I’m binding a Gridview with an EntityDataSource to it. By now, everything is fine.

But how can I specify a WHERE clause on a MyEntity.MyEnumProperty?

Here is what I have tried so far:

Convert.ToInt32(it.MyEnumProperty) = @MyParam // Does not work
CONVERT(it.MyEnumProperty AS INT) = @MyParam // Still does not work

I also tried to set Int32 to DbType of my params for both these values but it fails. Also, I tried to bind it to a control or specifying a default value but it always fails saying it’s impossible to convert a String value to MyEnum.

I know it may be pretty simple but all my research on Google returned no answer about this.

Answer 1

Pretty simple finaly.

Easiest way were to specify manualy my where clause and convert it. I’d found this answer somewhere saying it’s impossible. It wasn’t, but only in previous version but work perfectly with EF4.

Here is my where clause :

<asp:EntityDataSource [...]
    Where="CAST(it.MyEnumProperty AS System.Int32) = @MyParamInWhereClauseWith">
    <WhereParameters>
        <asp:Parameter Name="MyEnumProperty" DbType="Int32" DefaultValue="1" />
    </WhereParameters>
</asp:EntityDataSource>