[Solved] FilterExpression Linq Syntax?

[Jeanne]

What exactly is the syntax for the FilterExpression? Sometimes it looks VB-like, other time C#-like. For example:

IsEmpty: (it["Member"] = "")
NotIsEmpty: (it["Member"] <> "")
IsNull: (it["Member"] == Convert.DBNull)
NotIsNull: ((it["Member"] != Convert.DBNull))

The first two linq expressions use = and <>, which is VB-like, but the second two use == and !=, which is C#-like!

Note: These were generated one after the other on the same grid with no other changes. Column type is GridBoundColumn (created in code-behind) with DataType = System.String.

[Tsvetoslav]

Hello Jeanne,

Do go carefully through the following help topic - it should contain the answer to your qestion:
http://www.telerik.com/help/aspnet-ajax/grid-operate-with-filter-expression-manually.html


All the best, Tsvetoslav
the Telerik team

[Jeanne]

Although full of interesting examples, that topic does not explain the SYNTAX of the expressions, not why the IsNull and NotIsNull expressions use C# expression operators while the others use VB expression operators.

[Marin]

Hi,

 The syntax of the expressions is based on the Dynamic LINQ Query Library as described in this blog post. You can check there the actual implementation to see why exactly this particular syntax is required.

Greetings,
Marin
the Telerik team