EntityFrameworkCore 扩展类 AddOrUpdate

现在项目用了前后端分离，所以每次提供接口的时候都是

Edit一个api接口，然后Add一个api接口，

然后做了一个后端项目突然想起来EF之前好像有个扩展类 AddOrUpdate，

于是网上找了下:代码如下

public static class ContextExtensions  
{  
    public static void AddOrUpdate(this DbContext ctx, object entity)  
    {  
        var entry = ctx.Entry(entity);  
        switch (entry.State)  
        {  
            case EntityState.Detached:  
                ctx.Add(entity);  
                break;  
            case EntityState.Modified:  
                ctx.Update(entity);  
                break;  
            case EntityState.Added:  
                ctx.Add(entity);  
                break;  
            case EntityState.Unchanged:  
                //item already in db no need to do anything  
                break;

            default:  
                throw new ArgumentOutOfRangeException();  
        }  
    }  
}  

 

参考：

https://www.michaelgmccarthy.com/2016/08/24/entity-framework-addorupdate-is-a-destructive-operation/

https://docs.microsoft.com/zh-cn/ef/ef6/saving/change-tracking/entity-state