C# 如何使用CreateObjectSet<;张力>;作为参数的张力在哪里?
我正在寻找一种将实体和tenty作为参数传递的方法,以便将此方法用作通用方法。诸如此类:C# 如何使用CreateObjectSet<;张力>;作为参数的张力在哪里?,c#,entity-framework,C#,Entity Framework,我正在寻找一种将实体和tenty作为参数传递的方法,以便将此方法用作通用方法。诸如此类: private void AttachSingleEntity(Entity singleEntity, TEntity Tentity) { ObjectSet<Tentity> objectSet = context.CreateObjectSet<Tentity>(); objectSet.Attach(single
private void AttachSingleEntity(Entity singleEntity, TEntity Tentity)
{
ObjectSet<Tentity> objectSet = context.CreateObjectSet<Tentity>();
objectSet.Attach(singleEntity);
}
改为
private void AttachSingleEntity<TEntity>(Entity singleEntity) where TEntity:class
{
ObjectSet<TEntity> objectSet = context.CreateObjectSet<TEntity>();
objectSet.Attach(singleEntity);
}
private void attachingleentity(实体singleEntity),其中tenntity:class
{
ObjectSet ObjectSet=context.CreateObjectSet();
Attach(singleEntity);
}
更改为
private void AttachSingleEntity<TEntity>(Entity singleEntity) where TEntity:class
{
ObjectSet<TEntity> objectSet = context.CreateObjectSet<TEntity>();
objectSet.Attach(singleEntity);
}
private void attachingleentity(实体singleEntity),其中tenntity:class
{
ObjectSet ObjectSet=context.CreateObjectSet();
Attach(singleEntity);
}
它显示错误:“类型'tenty'必须是引用类型,才能将其用作泛型类型或方法'System.Data.Objects.ObjectSet'中的参数'tenty'”@jaqing然后添加一个类约束。我编辑了我的答案。当然,我注意到第二个参数不是必需的。它显示了一个错误:“类型‘tenty’必须是引用类型,才能在泛型类型或方法‘System.Data.Objects.ObjectSet’@jaqing中用作参数‘tenty’,然后添加一个类约束。我编辑了我的答案。我注意到第二个参数当然不是必需的。