Question

我需要在.net核心库中的存储库类中包装一些函数。但我得到一个错误，我的构造函数没有正确的构造函数。我究竟做错了什么？这是我的DBcontext代码

 public class effMercContext : DbContext
{
    public DbSet<Department> Departments { get; set; }
    public DbSet<Employee> Employees { get; set; }
    public DbSet<Project> Projects { get; set; }
    public effMercContext(DbContextOptions<effMercContext> options)
        : base(options)
    {
    }
}
     public class EffMercDbContextFactory : IDbContextFactory<effMercContext>
{
    public effMercContext Create(DbContextFactoryOptions options)
    {
        var builder = new DbContextOptionsBuilder<effMercContext>();
        builder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=pinchdb;Trusted_Connection=True;MultipleActiveResultSets=true");
        return new effMercContext(builder.Options);
    }
}

到目前为止我的存储库类

public class EmployeeRepository
{
    public Employee GetByID(int id)
    {
        using (effMercContext db = new effMercContext())
        {

        }
    }
}

Answer 1

那是因为你在这里调用没有参数的构造函数：

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<span class="comment-likes">12</span>

但是在你的public Employee GetByID(int id) { using (effMercContext db = new effMercContext()) { } }类中，你只有一个带有一个参数的构造函数：

DbContext

查看这篇文章，了解如何使用public class effMercContext : DbContext { public effMercContext(DbContextOptions<effMercContext> options) : base(options) { } }：https://docs.efproject.net/en/latest/miscellaneous/configuring-dbcontext.html

Answer 2

您可以将<TextView id="textFieldBody" hint="Some hint" text="{{ }}" editable="true" class="TextField" returnKeyType="done" />修改为以下内容......

EmployeeRepository

要了解详情，您可以关注this

从.net核心库中获取存储库

2 个答案: