Remotion.Linq.SqlBackend.SqlStatementModel.SqlSpecificExpressions.SqlLikeExpression.BuildRightExpression C# (CSharp) Method

    private static Expression BuildRightExpression (Expression unescapedSearchText, string likePrefix, string likePostfix)
    {
      Expression rightExpression;
      var argumentAsConstantExpression = unescapedSearchText as ConstantExpression;
      if (argumentAsConstantExpression != null)
      {
        if (argumentAsConstantExpression.Value == null)
          rightExpression = null;
        else
        {
          var escapedSearchText = SqlLikeExpression.Escape ((string) argumentAsConstantExpression.Value, @"\");
          rightExpression = Expression.Constant (string.Format ("{0}{1}{2}", likePrefix, escapedSearchText, likePostfix));
        }
      }
      else
      {
        var escapedSearchExpression = SqlLikeExpression.Escape (unescapedSearchText, @"\");
        var concatMethod = typeof (string).GetMethod ("Concat", new[] { typeof (string), typeof (string) });
        var patternWithPrefix =
            !string.IsNullOrEmpty (likePrefix)
                ? Expression.Add (new SqlLiteralExpression (likePrefix), escapedSearchExpression, concatMethod)
                : escapedSearchExpression;
        var patternWithPrefixAndPostfix =
            !string.IsNullOrEmpty (likePostfix)
                ? Expression.Add (patternWithPrefix, new SqlLiteralExpression (likePostfix), concatMethod)
                : patternWithPrefix;
        rightExpression = patternWithPrefixAndPostfix;
      }
      return rightExpression;
    }