我有一个表格,用户可以修改使用一个DataGrid对象的集合。当打开表单创建原始集合的深层副本,如果按下取消按钮我只是丢弃该副本。
的问题是,当确定按钮按我不得不调和的变化可能是:
- 现有对象的修改的属性
- 新的对象添加到集合中的任何地方。
- 现有对象中删除。
- 现有对象重新排序。
因为我需要保留原来的引用我不能只清除收集并添加修改的项目。
你知道一个简单的算法,将同步两个集合这样?
我使用C#3.5所以LINQ是可用的。
解决方案我刚刚制定了以下算法的一个项目我的工作,我认为它与你的要求。它遵循这样的步骤:
这方法保持新秩序并重新使用原来的引用,但要求你的对象具有一个唯一的标识符。我使用一个GUID为
VAR originalPersons = m_originalList.ToList(); m_originalList.Clear(); 的foreach(在m_modifiedList VAR modifiedPerson) { VAR originalPerson = originalPersons.FirstOrDefault(C => c.ID == modifiedPerson.ID); 如果(originalPerson == NULL) m_originalList.Add(modifiedPerson); ,否则 { m_originalList.Add(originalPerson); originalPerson.Document = modifiedPerson.Document; originalPerson.Name = modifiedPerson.Name; :} }
祝你好运。
I have a form where users can modify a collection of objects using a DataGrid. When the form is opened I create a deep copy of the original collection and if the Cancel button is pressed I just discard that copy.
The problem is that when the OK button is pressed I have to reconcile the changes which might be:
- Modified properties of existing objects
- New objects added to any place in the collection.
- Existing objects removed.
- Existing objects re-ordered.
Since I need to keep the original references I can't just clear the collection and add the modified items.
Do you know a simple algorithm that would synchronize two collections like this?
I'm using C# 3.5 so LINQ is available.
解决方案I just worked out the following algorithm for a project I'm working on and I think it complies with your requirements. It follows this steps:
This method maintains the new order and reuses the original references but requires that your objects have an unique identifier. I'm using a Guid for that.
var originalPersons = m_originalList.ToList(); m_originalList.Clear(); foreach (var modifiedPerson in m_modifiedList) { var originalPerson = originalPersons.FirstOrDefault(c => c.ID == modifiedPerson.ID); if (originalPerson == null) m_originalList.Add(modifiedPerson); else { m_originalList.Add(originalPerson); originalPerson.Document = modifiedPerson.Document; originalPerson.Name = modifiedPerson.Name; ... } }Good luck.
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