我正在为我的MVCEF应用程序创建搜索功能。我正在使用动态查询创建它。并遵循以下方法https://www.codeproject.com/Articles/493917/Dynamic-Querying-with-LINQ-to-Entities-and-Express
它用于为实体的bool和string字段创建 predicate 。我的应用中的主实体是Applicant
以下是EDMX Applicant

public partial class Applicant
    {

      public Applicant()
       {
         this.ApplicantEducations = new HashSet<ApplicantEducation>();
         this.ApplicantSkills = new HashSet<ApplicantSkill>();
         this.Applications = new HashSet<Application>();
         this.Experiences = new HashSet<Experience>();
        }

    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public byte[] CV_Upload1 { get; set; }
    public string CV_Upload2 { get; set; }
    public string email { get; set; }
    public string password { get; set; }
    public Nullable<System.DateTime> DOB { get; set; }

   virtual ICollection<ApplicantEducation> ApplicantEducations { get; set; }
   virtual ICollection<ApplicantSkill> ApplicantSkills { get; set; }
   virtual ICollection<Application> Applications { get; set; }
   virtual ICollection<Experience> Experiences { get; set; }
}

我想搜索，即与机构的名称，这是提交在类型的研究所的申请人教育。申请人可以有一个或多个申请人教育对象。
以下是我的应用程序教育的EDMX类

public partial class ApplicantEducation
{
    public int id { get; set; }
    public Nullable<int> ApplicantId { get; set; }
    public Nullable<int> InstituteId { get; set; }
    public Nullable<int> EducationLevelId { get; set; }
    public Nullable<bool> IsComplete { get; set; }
    public Nullable<System.DateTime> DateStart { get; set; }
    public Nullable<System.DateTime> DateEnd { get; set; }
    public Nullable<short> GPA { get; set; }

    public virtual EducationLevel EducationLevel { get; set; }
    public virtual Institute Institute { get; set; }
    public virtual Applicant Applicant { get; set; }
}

我的Institute实体类是这样的

public class Institute
  {
         public int Id { get; set; }
         public string Name { get; set; }

  }

因此，用户将通过指定机构名称进行搜索，所有申请人将从该机构获得教育检索。
正如我上面提到的链接。下面的例子演示了字符串字段 predicate 的构建

private static Expression<Func<TDbType, bool>> ApplyStringCriterion<TDbType,
        TSearchCriteria>(TSearchCriteria searchCriteria, PropertyInfo searchCriterionPropertyInfo,
        Type dbType, MemberInfo dbFieldMemberInfo, Expression<Func<TDbType, bool>> predicate)
    {
        // Check if a search criterion was provided
        var searchString = searchCriterionPropertyInfo.GetValue(searchCriteria) as string;
        if (string.IsNullOrWhiteSpace(searchString))
        {
            return predicate;
        }
        // Then "and" it to the predicate.
        // e.g. predicate = predicate.And(x => x.firstName.Contains(searchCriterion.FirstName)); ...
        // Create an "x" as TDbType
        var dbTypeParameter = Expression.Parameter(dbType, @"x");
        // Get at x.firstName
        var dbFieldMember = Expression.MakeMemberAccess(dbTypeParameter, dbFieldMemberInfo);
        // Create the criterion as a constant
        var criterionConstant = new Expression[] { Expression.Constant(searchString) };
        // Create the MethodCallExpression like x.firstName.Contains(criterion)
        var containsCall = Expression.Call(dbFieldMember, StringContainsMethod, criterionConstant);
        // Create a lambda like x => x.firstName.Contains(criterion)
        var lambda = Expression.Lambda(containsCall, dbTypeParameter) as Expression<Func<TDbType, bool>>;
        // Apply!
        return predicate.And(lambda);
    }

以上代码用于为包含在主实体类（申请人）中的简单字符串字段构建 predicate 。但是申请人也有ApplicationEducation集合，所以我的问题是如何为linq的where子句（方法）创建动态查询（ predicate ），以便当用户搜索学院名称时，检索到的所有申请人都具有相同的教育背景。
我的搜索条件如下所示，

public class SearchCriteriaVM
{
    public int Id { get; set; }
    public string Name { get; set; }
    public DateTime? DOB { get; set; }     
    public string Description { get; set; }

    public ICollection<Models.ApplicantEducationVM> ApplicantEducations { get; set; }
    public ICollection<Models.ExperienceVM> Experiences { get; set; }
    public ICollection<Models.ApplicantSkillsVM> ApplicantSkills { get; set; }

    public ICollection<Models.ApplicationsVM> Applications { get; set; }


}

我有点搞不懂这怎么可能。
谢谢