private static Expression GetExpressionBody(ParameterExpression param, FilterGroup group)
{
param.CheckNotNull("param");
//如果无条件或条件为空，直接返回 true表达式
if (group == null || (group.Rules.Count == 0 && group.Groups.Count == 0))
{
return(Expression.Constant(true));
}
List <Expression> bodys = new List <Expression>();
bodys.AddRange(group.Rules.Select(rule => GetExpressionBody(param, rule)));
bodys.AddRange(group.Groups.Select(subGroup => GetExpressionBody(param, subGroup)));
if (group.Operate == FilterOperate.And)
{
return(bodys.Aggregate(Expression.AndAlso));
}
if (group.Operate == FilterOperate.Or)
{
return(bodys.Aggregate(Expression.OrElse));
}
// throw new OSharpException(Resources.Filter_GroupOperateError); //helang
return(null);
}
private static Expression GetExpressionBody(ParameterExpression param, FilterGroup group)
{
param.CheckNotNull("param");
//如果无条件或条件为空，直接返回 true表达式
if (group == null || (group.Rules.Count == 0 && group.Groups.Count == 0))
{
return(Expression.Constant(true));
}
List <Expression> bodys = new List <Expression>();
bodys.AddRange(group.Rules.Select(rule => GetExpressionBody(param, rule)));
bodys.AddRange(group.Groups.Select(subGroup => GetExpressionBody(param, subGroup)));
if (group.Operate == FilterOperate.And)
{
return(bodys.Aggregate(Expression.AndAlso));
}
if (group.Operate == FilterOperate.Or)
{
return(bodys.Aggregate(Expression.OrElse));
}
throw new Exception("查询条件组中的操作类型错误，只能为And或者Or。");
}