条款返回错误LAMBDA EXPRESSION QUERY

Question

我有这个

var myvar = _context.Person.Include(u => u.oneByNavigation).Include(u => u.twoNavigation);

 if (!String.IsNullOrEmpty(searchString))
            {
                myvar = dbContext.Where(s => s.Fname.Contains(searchString));// 
                dbContext.Where(u => u.Fname.Contains(searchString) || 
                 u.Lname.Contains(searchString));
            }

我收到错误

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不能将类型system.linq.IQuerable转换为   Microsoft.EntityframeworkCore.Query.IIncludableQuerable

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Answer 1

而不是var myvar = _context.Person[...]，请尝试IQueriable<Person> myvar = _context.Person[...]。

如果你检查myvar的类型，你会发现它不是IQuariable，而是IIncludableQuerable。

Answer 2

嗯，你被覆盖myvar的值。 试试这个

IQueriable<Person> myvar = _context.Person.Include(u => u.oneByNavigation).Include(u => u.twoNavigation);

 if (!String.IsNullOrEmpty(searchString))
            {
                myvar = myvar // <-- not dbContext
                        .Where(s => s.Fname.Contains(searchString));
            }