这是表格
用户
UserId
UserName
Password
EmailAddress
还有代码..
public void ChangePassword(int userId, string password){
//code to update the password..
}
这是表格
用户
UserId
UserName
Password
EmailAddress
还有代码..
public void ChangePassword(int userId, string password){
//code to update the password..
}
当前回答
public async Task<bool> UpdateDbEntryAsync(TEntity entity, params Expression<Func<TEntity, object>>[] properties)
{
try
{
this.Context.Set<TEntity>().Attach(entity);
EntityEntry<TEntity> entry = this.Context.Entry(entity);
entry.State = EntityState.Modified;
foreach (var property in properties)
entry.Property(property).IsModified = true;
await this.Context.SaveChangesAsync();
return true;
}
catch (Exception ex)
{
throw ex;
}
}
其他回答
Ladislav的答案更新为使用DbContext(在EF 4.1中引入):
public void ChangePassword(int userId, string password)
{
var user = new User() { Id = userId, Password = password };
using (var db = new MyEfContextName())
{
db.Users.Attach(user);
db.Entry(user).Property(x => x.Password).IsModified = true;
db.SaveChanges();
}
}
我用这个:
实体:
public class Thing
{
[Key]
public int Id { get; set; }
public string Info { get; set; }
public string OtherStuff { get; set; }
}
数据库上下文:
public class MyDataContext : DbContext
{
public DbSet<Thing > Things { get; set; }
}
访问器代码:
MyDataContext ctx = new MyDataContext();
// FIRST create a blank object
Thing thing = ctx.Things.Create();
// SECOND set the ID
thing.Id = id;
// THIRD attach the thing (id is not marked as modified)
db.Things.Attach(thing);
// FOURTH set the fields you want updated.
thing.OtherStuff = "only want this field updated.";
// FIFTH save that thing
db.SaveChanges();
实体框架跟踪您通过DbContext从数据库查询的对象的更改。例如,如果你的DbContext实例名是DbContext
public void ChangePassword(int userId, string password){
var user = dbContext.Users.FirstOrDefault(u=>u.UserId == userId);
user.password = password;
dbContext.SaveChanges();
}
我一直在寻找同样的方法,最后我找到了解决方案
using (CString conn = new CString())
{
USER user = conn.USERs.Find(CMN.CurrentUser.ID);
user.PASSWORD = txtPass.Text;
conn.SaveChanges();
}
相信我,这对我很有效。
在实体框架核心中,Attach返回条目,所以你所需要的是:
var user = new User { Id = userId, Password = password };
db.Users.Attach(user).Property(x => x.Password).IsModified = true;
db.SaveChanges();