Question

以下内容将选择包含两者 FirstName和LastName

的关键字的人

                if (searchFields.Contains("FirstName"))
                {
                    query = query.Where(p => p.FirstName.Contains(keyword));
                }

                if (searchFields.Contains("LastName"))
                {
                    query= query.Where(p => p.LastName.Contains(keyword));
                }

如何更改它，以便选择 FirstName或LastName包含关键字的人？

换句话说，我正在寻找OR条款，但我不知道该怎么做

Answer 1

bool searchFirstName = searchFields.Contains("FirstName");
bool searchLastName = searchFields.Contains("LastName");
if (searchFirstName && searchLastName)
{
    query = query.Where(p => p.FirstName.Contains(keyword) 
                          || p.LastName.Contains(keyword));
}
else if(searchFirstName)
{
    query = query.Where(p => p.FirstName.Contains(keyword));
} 
else if(searchLastName)
{
    query = query.Where(p => p.LastName.Contains(keyword));
}

Answer 2

这就是我需要的：

http://blogs.msdn.com/b/meek/archive/2008/05/02/linq-to-entities-combining-predicates.aspx

它正在使用LINQ表达式，它使用Expression.Or

组合它们

＆＃39;凡＆＃39;有条件的条款＆＃39;包含＆＃39;

2 个答案: