c# - Dynamic Where in linq MVC -


i trying filter model 2 dropdown in mvc project

var model = (from x in db.table....             join y in db.table...).where(where)...

my logic is

            string = string.empty;              if (search.anno != null)                 = " anno = " + search.anno ;              if (search.cliente != null)             {                 if (!string.isnullorempty(where))                 {                     += " , codice_cliente = '" + search.cliente + "'";                 }                 else                 {                     = " codice_cliente = '" + search.cliente + "'";                 }             }

i error: system.linq.dynamic.parseexception: character literal must contain 1 character

i in += " , codice_cliente = '" + search.cliente + "'";

i saw apex @ end '"

how can solve

you need use double equals expression , double quotes strings string = string.empty;

            if (search.anno != null)                 = " anno == " + search.anno ;              if (search.cliente != null)             {                 if (!string.isnullorempty(where))                 {                     += " , codice_cliente == \"" + search.cliente + "\"";                 }                 else                 {                     = " codice_cliente == \"" + search.cliente + "\"";                 }             }

note prone sql injection , should avoided, should use parameters, this:

var model = (from x in db.table.... join y in db.table...).where(wherestring, params)...

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