我想在存储库模式中执行通用搜索选项

Question

这里我实现了通用存储库模式以同时进行 CRUD 操作，我也想做搜索选项，任何人都可以告诉我查询来做通用搜索选项，我的代码如下

public interface IRepository<T> where T : class
{
    IEnumerable<T> GetAll();
    T GetById(object Id);
    T Insert(T obj);
    void Delete(object Id);
    T Update(T obj);
    void Save();
    long Count();
}
public class Repository<T> : IRepository<T> where T : class
{
    private PegasusPlusEntities context;
    private DbSet<T> dbSet;
    public Repository()
    {
        context = new PegasusPlusEntities();
        dbSet = context.Set<T>();
    }
    public IEnumerable<T> GetAll()
    {
        return dbSet.ToList();
    }
    public T GetById(object id)
    {
        return dbSet.Find(id);
    }
    public T Insert(T obj)
    {
        dbSet.Add(obj);
        Save();
        return obj;
    }
    public void Delete(object id)
    {
        T entityToDelete = dbSet.Find(id);
        Delete(entityToDelete);
    }
    public void Delete(T entityToDelete)
    {
        if (context.Entry(entityToDelete).State == EntityState.Detached)
        {
            dbSet.Attach(entityToDelete);
        }
        dbSet.Remove(entityToDelete);
    }
    public T Update(T obj)
    {
        dbSet.Attach(obj);
        context.Entry(obj).State = EntityState.Modified;
        Save();
        return obj;
    }
    public long Count()
    {
        return dbSet.Count();
    }

    public void Save()
    {
        try
        {
            context.SaveChanges();

        }
        catch (DbEntityValidationException dbEx)
        {
            foreach (var validationErrors in dbEx.EntityValidationErrors)
            {
                foreach (var validationError in validationErrors.ValidationErrors)
                {


                }
            }
        }
    }
    protected virtual void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (context != null)
            {
                context.Dispose();
                context = null;
            }
        }
    }
}

提前致谢...

Answer 1

有几种方法可以做到这一点，但这里有一个简单的例子

向当前接口添加一个方法以允许进行通用搜索

IEnumerable<T> Search(Expression<Func<T,bool>> predicate);

一个简单的实现看起来像这样

public IEnumerable<T> Search(Expression<Func<T,bool>> predicate) {
    return dbSet.Where(predicate).ToList();
}

使用它的一个例子是

var repository = new Repository<Person>();
var searchResults = repository.Search(p => p.FirstName == "John" && p.LastName == "Doe");

我想在存储库模式中执行通用搜索选项

i would like to do the generic search option in repository pattern

c#

entity-framework

repository-pattern