有谁知道如何插入唯一值而无需明确检查现有值？
我能够完成这项工作，但我对我必须编写的代码印象不深。基本上，我创建了一个辅助函数来检查容器上的唯一值。
结构非常基本。
[条目] *<----->* [唯一值]
主要代码
public static void ImportStuff ()
{
//Generate a list of importable items
List<DtoItems> items = DtoItemGetter.GetItems();
using( var container = new MyEntities() )
{
foreach( var item in items )
{
Entry newEntry = CreateNewEntry( item );
//********
// Here's the call to my helper method to check
// for the uniqueness of the values on the item I am importing
//********
item.UniqueValuesList.ForEach(
uv => HelperMethod( container, newEntry, uv ) );
containter.AddToEntries( newEntry );
//Less important... but it would be nice if I didn't
// have to save everytime I add an new entry... but
// this necessary for the Helper check.
container.SaveChanges();
}
}
}
辅助方法
public static void HelperMethod(
MyEntities container, Entry newEntry, string checkValue )
{
UniqueItem unique = null;
//Have to check to see if it already exists in the DB
container.uniqueItems.ForEach( uv => {
if( uv.Name == checkValue )
{
unique = uv;
} } );
//Here's the money, either add the one I found, or
//create a new one... meh
newEntry.UniqueItems.Add(
unique ?? new UniqueItem { Name = checkValue } );
}
希望这有足够的意义。