Question

我想将此方法用于不同的类

有没有办法将此变量 Collection 转换为其他方法

因为我有四个类，如RSummary

//ResultQuery : i want to cast this variable more than one Type  eg : 
var collection = await ResultQuery(entity, _classId).Cast<RSummary>().ToListAsync();
foreach (var result in collection)
{
    decimal Percentile = 0;
    int Rank = 0;
    // Rank
    if (result.Percentage == Percentile)
        result.Rank = Rank; 
    else
    {
        result.Rank = Rank + 1; Percentile = result.Percentage; Rank++;
    }
    var Values = await GetGrades(result.Percentage); //returns student GPA, Grade, etc.
    result.Grade = Values.Grade; 
    result.Description= Values.Description;
    result.GPA = Values.GPA;
    Values = null;
    entity.Entry(result).State = EntityState.Modified;
}

Rsummary class

public class RSummary
{
public int Id { get; set; }
public int ExamsId { get; set; }
public string StudentsId { get; set; }
public decimal HM { get; set; }
public decimal Marks { get; set; }
public decimal Percentage { get; set; }
public string Grade { get; set; }
public int Rank { get; set; }
public string Result { get; set; }
public decimal GPA { get; set; }

public virtual Exam Exams { get; set; }
public virtual Student Students { get; set; }
}

Answer 1

假设有共同的属性，您可以使用界面和泛型

执行类似的操作

public interface IMyAwesomeInterface
{
   decimal Percentage { get; set; }
   int Grade { get; set; }
   string Description { get; set; }
   decimal GPA { get; set; }
   int  Rank { get; set; }
}

public void SomeMethod<T>(Entity entity, int classId)
   where T : IMyAwesomeInterface
{
   var collection = await ResultQuery(entity, classId).Cast<T>().ToListAsync();
   foreach (var result in collection)
   {
      decimal Percentile = 0;
      int Rank = 0;
      if (result.Percentage == Percentile)
         result.Rank = Rank;
      else
      {
         result.Rank = Rank + 1;
         Percentile = result.Percentage;
         Rank++;
      }
      var Values = await GetGrades(result.Percentage); //returns student GPA, Grade, etc.
      result.Grade = Values.Grade;
      result.Description = Values.Description;
      result.GPA = Values.GPA;
      Values = null;
      entity.Entry(result).State = EntityState.Modified;
   }
}

免责声明：只是基于所提供代码的示例，我对您的业务逻辑和其他问题不承担任何责任，或者对儿童可能造成的伤害

我怎样才能使这个代码更通用

1 个答案: