Linq到Sql任意关键字搜索查询

这可能是一个艰难的过程。。。我想你得自己写一个接线员。

( 更新: 是的,我测试过了,它很有效。)

public static class QueryExtensions
{
    public static IQueryable<TEntity> LikeAny<TEntity>(
        this IQueryable<TEntity> query,
        Expression<Func<TEntity, string>> selector,
        IEnumerable<string> values)
    {
        if (selector == null)
        {
            throw new ArgumentNullException("selector");
        }
        if (values == null)
        {
            throw new ArgumentNullException("values");
        }
        if (!values.Any())
        {
            return query;
        }
        var p = selector.Parameters.Single();
        var conditions = values.Select(v =>
            (Expression)Expression.Call(typeof(SqlMethods), "Like", null,
                selector.Body, Expression.Constant("%" + v + "%")));
        var body = conditions.Aggregate((acc, c) => Expression.Or(acc, c));
        return query.Where(Expression.Lambda<Func<TEntity, bool>>(body, p));
    }
}

string[] terms = new string[] { "blah", "woo", "fghwgads" };
var results = stuff.LikeAny(s => s.Title, terms);

另外,您需要添加 System.Linq.Expressions System.Data.Linq.SqlClient 名称空间中的名称空间 QueryExtensions 班级。