C# 使用实体框架将新记录插入数据库

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,

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"); 
} 

id被定义为主键

我想在此表中插入一条新记录。这是我的密码，我不能上班

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");
}

我得到的错误在dbcd.AddToCustomer_Downloadscollection行上

与“CustomerPortalMVC.Models.CustomerPortalEntities\u Customer\u Downloads.AddToCustomer\u Downloads StomerPortalMVC.Models.Customer\u Downloads”匹配的最佳重载方法 有一些无效的参数

参数“1”：无法从“System.Web.Mvc.FormCollection”转换为 'CustomerPortalMVC.Models.Customer_下载'

---

我需要更改什么才能使其生效？

您需要创建Customer\u Downloads类的实例，并将其传递给AddToCustomer\u Downloads方法。错误消息告诉您，该方法的接口需要Customer\u Downloads对象，但您正在向其传递FormCollection对象。

您需要创建Customer\u Downloads类的实例，并将其传递给AddToCustomer\u Downloads方法。错误消息告诉您，该方法的接口需要一个Customer\u Downloads对象，但您正在向它传递一个FormCollection对象。

您需要提供一个CustomerPortalMVC.Models.Customer\u类型的对象下载到方法AddToCustomer\u Downloads，然后在数据上下文上调用SaveChanges，如下所示：

[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,

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"); 
} 

---

您需要提供CustomerPortalMVC.Models.Customer\u Downloads类型的对象，以方法AddToCustomer\u Downloads，然后在数据上下文上调用SaveChanges，如下所示：

[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,

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"); 
} 

---

老兄，我知道这是一件愚蠢的事，一个简单的，谢谢你的工作！老兄，我知道这是一件愚蠢的事，一个简单的，谢谢你的工作！