使用列表中的任何项目过滤 IQueryable

Question

所以我有一个数据库，我正在尝试向 QueryBuilder 添加一个方法，它将 return IQueryable 像这样：

WHERE
student.Name == "Alan" OR student.Name == "Zoe" OR student.Name == "X" OR ...

我有一个可以任意大小的名称列表。

代码如下所示：

public class QueryBuilder
{
    private SudentData context;
    private IQueryable<Students> query;

    public QueryBuilder(StudentData context)
    {
        context = context;
        query = context.Students;
    }

    public QueryBuilder WithDateFrom(DateTime date)
    {
        query = query.Where(x => x.Created >= date);
        return this;
    }

    public QueryBuilder WithName(List<string> names)
    {
        if (name.Any())
        {
            //Missing query
            return this;   
        }
        else
        {
            return this;
        }
    }

    public IQueryable<StudentDataModel> Build()
    {
        return query.Select(x => new StudentDataModel()
        {
            Name = x.Name,
            DateTo = x.DateTo,
            DateFrom = x.DateFrom
        });
    }
}

Answer 1

你可以使用这个：

public QueryBuilder WithName(List<string> names)
{
    if (name.Any())
    {
        query = query.Where(x => names.Contains(x.Name));
        return this;
    }
    else
    {
        return this;
    }
}

使用列表中的任何项目过滤 IQueryable

Filter IQueryable with any item from the list

c#

.net

entity-framework

iqueryable