private void Length()
{
Expression <Func <Student, bool> > exp = it => SqlFunc.Length("aaaa") > 1;
SqlServerExpressionContext expContext = new SqlServerExpressionContext();
expContext.Resolve(exp, ResolveExpressType.WhereSingle);
var value = expContext.Result.GetString();
var pars = expContext.Parameters;
base.Check(value, pars, "(LEN(@MethodConst0) > @Const1 )", new List <SugarParameter>()
{
new SugarParameter("@MethodConst0", "aaaa"), new SugarParameter("@Const1", 1)
}, "Length error");
}