Question

假设我有以下用于Entity Framework 5 Code First的类。我需要搜索所有行业或部门的一系列关键字，返回所有与任何关键字匹配的潜在客户。我还需要搜索相同关键字的潜在客户名称。我坚持的是如何搜索多个关键字。

主类

public class Lead
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public virtual ICollection<Industry> Industries { get; set; }
    public virtual ICollection<Division> Divisions { get; set; }
}

行业类

public class Industry
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public ICollection<Lead> Leads { get; set; }
}

分类

public class Division
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public ICollection<Lead> Leads { get; set; }
}

服务/存储库调用

public IQueryable<Lead> GetByKeywords(string keyword)
    {
        var result = leadRepository.GetAll().Where
            (x => x.Industries.Any(i => i.Name == keyword)
            || x.Divisions.Any(d => d.Name == keyword)
            || x.Name.Contains(keyword));

        return result;
    }

以上查询适用于单个关键字。但是如果我在字符串中有多个单词并且我想匹配任何单个关键字，它就不起作用。

Answer 1

public IEnumerable<Lead> GetByKeywords(string[] keywords)
    {
        var result = GetAll().Where
            (x =>x.Industries.Any(i => keywords.Any(kw=>kw==i.Name))
            || x.Divisions.Any(d =>keywords.Any(k=>x.Name==k))
            || keywords.Any(kew => x.Name.Contains(kew)));

        return result;
    }

Answer 2

您需要将字符串拆分为List并遍历每个关键字。这样的事情......（在我的头顶）

IQueryable<Lead> GetByKeywords(string allKeywords)
{
    List<string> keywords = allKeywords.Split(" ");
    var result = leadRepository.GetAll();

    foreach (string keyword in keywords)
    {
        result = result.Where
            (x => x.Industries.Any(i => i.Name == keyword)
            || x.Divisions.Any(d => d.Name == keyword)
            || x.Name.Contains(keyword));
    }

    return result;
}

使用EF在Linq中搜索查询

2 个答案: