6

This is my code

 searchDataContext db = new searchDataContext();

    var query = (from p in db.SearchFirst(city, area)
                select new
                {
                    ID = p.Id,
                    Address = p.address,
                    Level = p.agahilevel

                });
    int count =query.Count();

    // records
    var q = query.Skip(Convert.ToInt32(start)).Take(Convert.ToInt32(width));

    if (q.Count() > 0)
    {
        int index = 0;
        str += "[";
        foreach (var row in q)
        {
            if (index == 0)

I have an error in this code

The query results cannot be enumerated more than once.

please check that and answer me.

4

3 回答 3

12

您不能使用缓存查询并对其进行多次迭代...
制作List<T>它并再试一次

var q = query.ToList(); // work on this
于 2013-04-23T12:59:16.273 回答
9

实现您的查询：

var addresses = (from p in db.SearchFirst(city, area)
                select new
                {
                    ID = p.Id,
                    Address = p.address,
                    Level = p.agahilevel

                })
                .Skip(Convert.ToInt32(start))
                .Take(Convert.ToInt32(width))
                .ToList();

然后用于Enumerable.Any检查它是否包含元素：

if(addresses.Any())
{
    int index = 0; // ...
}
于 2013-04-23T13:00:41.410 回答
5

如果您添加.ToList()到查询中，您的问题将得到解决

于 2013-04-23T13:00:08.363 回答