private static Expression <Func <T, bool> > GetGroupExpression <T>(DataFilterGroup paramGroup, DataFilter <T> filter)
where T : BaseModel
{
bool startParam = !(paramGroup.Type == FilterGroupType.Or &&
(paramGroup.ParamGroupList.Any() || paramGroup.ParamList.Any()));
Expression <Func <T, bool> > expressions = PredicateBuilder.New <T>(startParam);
paramGroup.ParamList.ForEach(param =>
{
Expression <Func <T, bool> > expression;
DataFilterQueryExpression <T> customExpression = filter.CustomQueryExpressionList.FirstOrDefault(x => x.Field == param.Field);
if (customExpression != null)
{
expression = customExpression.Expression;
}
else
{
expression = FilterExpressionProvider.CreateExpression <T>(param);
}
expressions = IncludeExpression(expressions, expression, paramGroup.Type);
});
paramGroup.ParamGroupList.ForEach(group =>
{
Expression <Func <T, bool> > expression = GetGroupExpression <T>(group, filter);
expressions = IncludeExpression(expressions, expression, paramGroup.Type);
});
return(expressions);
}
public DataFilter <TModel> AddCustomQueryExpression(string field, Expression <Func <TModel, bool> > expression)
{
DataFilterQueryExpression <TModel> expr = new DataFilterQueryExpression <TModel>
{
Field = field,
Expression = expression
};
CustomQueryExpressionList.Add(expr);
return(this);
}