c# - 使用 Entity Framework 将新记录插入数据库

Question

我的数据库中有这样一个表:

[id] [uniqueidentifier] NOT NULL,
[user_id] [uniqueidentifier] NOT NULL,
[download_type] [nvarchar](50) NOT NULL,
[download_id] [nvarchar](50) NOT NULL,
[download_date] [datetime] NOT NULL,
[user_ip_address] [nvarchar](20) NOT NULL,

id 被定义为主键。

我想在这个表中插入一条新记录。这是我无法开始工作的代码。

CustomerPortalEntities_Customer_Downloads dbcd = new CustomerPortalEntities_Customer_Downloads();

public ActionResult Download(string id)
{
    var collection = new FormCollection();
    collection.Add("user_id", Membership.GetUser().ProviderUserKey.ToString());
    collection.Add("download_type", "Car");
    collection.Add("download_id", id);
    collection.Add("download_date", DateTime.Now.ToString());
    collection.Add("user_ip_address", Request.ServerVariables["REMOTE_ADDR"]);            

    dbcd.AddToCustomer_Downloads(collection);

    return Redirect("../../Content/files/" + id + ".EXE");
}

我得到的错误是在线 dbcd.AddToCustomer_Downloads(collection);

The best overloaded method match for 'CustomerPortalMVC.Models.CustomerPortalEntities_Customer_Downloads.AddToCustomer_Downloads(CustomerPortalMVC.Models.Customer_Downloads)' has some invalid arguments

Argument '1': cannot convert from 'System.Web.Mvc.FormCollection' to 'CustomerPortalMVC.Models.Customer_Downloads'

我需要更改什么才能使其正常工作？

Answer 1

您需要向方法 AddToCustomer_Downloads 提供类型为 CustomerPortalMVC.Models.Customer_Downloads 的对象，然后像这样在您的数据上下文中调用 SaveChanges :

public ActionResult Download(string id) 
{ 
    var item = new CustomerPortalMVC.Models.Customer_Downloads(); 
    item.user_id = Membership.GetUser().ProviderUserKey.ToString(); 
    item.download_type = "Car"; 
    item.download_id = id; 
    item.download_date = DateTime.Now.ToString(); 
    item.user_ip_address = Request.ServerVariables["REMOTE_ADDR"];             
    dbcd.AddToCustomer_Downloads(item); 
    dbcd.SaveChanges(); 
    return Redirect("../../Content/files/" + id + ".EXE"); 
}