Copy one object to another

I have 2 tables, user and userprofile. The use开发者_如何学运维rprofile table has a lot of fields similar to the user table. What I need to do is, on click of a button I need to copy all the fields of user table to userprofile table.

How can I do that?

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Can you create a constructor on UserProfile that takes a User instance as a parameter and do it there? Not sure that is the best approach or if that violates good design. There is a utility called AutoMapper out there that is good at inferring links between two seemingly unrelated objects, you may want to check that out because it is pretty cool.

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Perhaps I'm not fully understanding your request. But if you have two tables such as

DataTable user;
DataTable userProfiles;

And you want userProfiles to contain the same fields (or rather same columns) as table1 you can use

userProfiles= user.Clone();  // This will copy the schema of user table
userProfiles= user.Copy();   // This will copy the schema AND data of user table 

Now if you want to copy on certain rows then you could do the following.

DataRow dr;
userProfiles= user.Clone();   // Do this first to create the schema.
foreach(DataRow row in user.Rows)
{
   if(...) // code to determine if you want to add this row
   {
      userProfiles.Rows.Add(row);  // This will add the same row from user table to userProfiles; Or you could create a new row using the 'dr' above and copy the data to provide a new DataRow
   }
}

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Perhaps this is overly simplistic, but what's stopping you from

UserProfile profile = new UserProfile();
profile.Name = UserModel[0].Name;
profile.OtherProperty = UserModel[0].OtherProperty;
...
DataServices.Save(profile);

If it's an encapsulation issue and you can't modify those properties, then Rob's answer about creating a constructor that takes a User object sounds appropriate.