Dynamic LINQ DateTime Comparison String Building - Linq To Entities

c# dynamic-linq entity-framework linq string

Question

I'm using the dynamic LINQ library by Scott Guthrie together with Entity Framework and C#.

I have to build my where string into a variable based on several factors and then pass the string variable to the where clause. For some reason, this will work:

ContactList = ContactList.Where("DateAdded >= @0", DateTime.Parse("12/1/2012"));

But this will not work

string WhereClause = string.Format("DateAdded >= {0}", DateTime.Parse("12/1/2012"));
ContactList = ContactList.Where(WhereClause);

As mentioned, I need to use it in the version of passing the variable. Anyone know why the second doesn't work?

Thanks in advance!

1
7
1/2/2013 5:19:08 PM

Accepted Answer

It seems what I was trying to do is not possible with the current DynamicLINQ library. The reason it didn't work was well outlined below by Tilak.

My solution was to modify the DynamicLINQ library to allow the query to be written as a string and passed to the where clause for Date/Time datatypes. The modification was found here by Paul Hatcher: LINQ TO SQL, Dynamic query with DATE type fields

4
5/23/2017 12:01:55 PM

Popular Answer

I was able to get it working with a slightly different string format using the information here.

Doing this worked fine for me:

ContactList.Where("DateAdded >= DateTime(2013, 06, 18)")

Note this does not work at all with DateTimeOffset columns.



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