Like operator or using wildcards in LINQ to Entities

I'm using LINQ 2 Entities. Following is the problem:

string str = '%test%.doc%' 
.Contains(str) // converts this into LIKE '%~%test~%.doc~%%'

Expected Conversion: LIKE '%test%.doc%'

If it was LINQ 2 SQL, I could have used SqlMethods.Like as somebody answered it in my previous question. But now as I'm using L2E not L2S, I need other solution.