Linq to entity with dynamically growing where 子句

Question

我正在尝试根据某些条件从实体中获取数据。 WHERE 子句将有任意数量的 'OR' 条件。我怎样才能做到这一点？

var skill = skillset.split(";"); //array can have any number of items
var EmployeeList1 = EmployeeList
   .Where(x => x.Primary1.ToUpper().Contains(skill[0])         
       || x.Primary2.ToUpper().Contains(skill[0])
       || x.Primary1.ToUpper().Contains(skill[1])                       
       || x.Primary2.ToUpper().Contains(skill[1]))
   .ToList();

return EmpMapper.Mapper.Map<List<EmployeeModel>>(EmployeeList1);

我需要为具有 'n' 个 'OR' 条件的 where 子句构建一个表达式。我尝试使用谓词，但出现异常（索引超出数组范围。）。

    var predicate =  PredicateBuilder.New<ResourceEntity>(true);
    for (int i = 0; i < skill.Count(); i++)
    {
       predicate= predicate.Or(p => p.Primary1.Contains(skill[i]));
    }

Answer 1

您必须将 for 变量复制到局部变量中：

var predicate = PredicateBuilder.New<ResourceEntity>(true);
for (int i = 0; i < skill.Length; i++)
{
    var s = skill[i];
    predicate = predicate.Or(p => p.Primary1.ToUpper().Contains(s));
    predicate = predicate.Or(p => p.Primary2.ToUpper().Contains(s));
}

Linq to entity with dynamically growing where 子句

Linq to entity with dynamically growing where clause

linq

predicate

where-clause

entity-framework-core

visual-studio-2019