Dynamically generate lambda expressions

Question

I need to dynamically generate lambda expressions, so far the only thing I have come up with is

 

http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx

I am a bit hesitant to use sample code, is there a better way to get this done?

Answer 1

Hi,

Some more context could help. For example if this is for a user criteria input form you could either construct the where clause in several steps or you could also generate an ESQL query (http://msdn.microsoft.com/en-us/library/bb387145.aspx) if you want something even more general.

The EF forum might be better depending on what is your overall goal (you are using Linq To Sql or EF or neither, what is your context ?).

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Answer 2

On 8/15/2011 5:30 AM, John Foot wrote:

> I need to dynamically generate lambda expressions, so far the only thing

> I have come up with is

>

> http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx

>

> I am a bit hesitant to use sample code, is there a better way to get

> this done?

>

 

What better way? This is no different than you making dynamic inline

T-SQL and submitting it for execution.

 

You might want to look at this.

 

http://tomasp.net/blog/dynamic-linq-queries.aspx

 

But my thing is keep it simple which your link seems to be doing.

 

Answer 3

You can dynamically construct a lambda expression using the Expression.Lambda method