I have a simple parent child relationship that I would like to load with LINQ to SQL. I want to load the children at the same time as the parent. The generated SQL is doing too much work. It is trying to count the children as well as join to them. I will not update these objects. I will not add children to the parent. I'm only interested in reading it. I have simplified the tables down
我有一个简单的父子关系，我想用LINQ to SQL加载。 我想与父母同时加载孩子。 生成的SQL做了太多工作。 它试图计数孩子以及加入他们。 我不会更新这些对象。 我不会将孩子添加到父母身上。 我只对阅读感兴趣。 我已将表格简化为最低限度。 实际上我有更多的专栏。 LINQ to SQL正在生成以下SQL SELECT [t0].[parentId] AS [Id], [t0].[name], [t1].[childId] AS [Id2], [t1].[parentId], [t1].[name] AS [name2], ( SE
I've read that Array.Clone performs shallow copy, however this code suggests that a deep copy of the original array is created ie any changes in cloned array are not being reflected in original array int[] arr = new int[] { 99, 98, 92, 97, 95 }; int[] newArr = (int[])arr.Clone(); //because this is a shallow copy newArr should refer arr newArr[0] = 100; //expected result 100 Console.WriteLine
我读过Array.Clone执行浅拷贝，但是此代码建议创建原始数组的深层副本，即克隆数组中的任何更改都不会反映到原始数组中 int[] arr = new int[] { 99, 98, 92, 97, 95 }; int[] newArr = (int[])arr.Clone(); //because this is a shallow copy newArr should refer arr newArr[0] = 100; //expected result 100 Console.WriteLine(arr[0]);//print 99 我在这里错过了明显的东西吗？ 当复制一个不可变结构集合（基元是不可变
I have a generic list of objects in C#, and wish to clone the list. The items within the list are cloneable, but there doesn't seem to be an option to do list.Clone() . Is there an easy way around this? 您可以使用扩展方法。 static class Extensions { public static IList<T> Clone<T>(this IList<T> listToClone) where T: ICloneable { return listToClone.Select(
我有一个C＃中的对象的通用列表，并希望克隆列表。 列表中的项目是可复制的，但似乎没有做list.Clone()的选项。 有没有简单的方法呢？ 您可以使用扩展方法。 static class Extensions { public static IList<T> Clone<T>(this IList<T> listToClone) where T: ICloneable { return listToClone.Select(item => (T)item.Clone()).ToList(); } } 如果你的元素是值类型，那么你可以
This question already has an answer here: Deep cloning objects 39 answers Implement DeepClone as an extension method of your base class, probably using reflection. If you don't have a single base class then define the extension method on an interface and apply that to your base classes. A more interesting question is why you want to clone whole object graphs. Is this some sort of fact
这个问题在这里已经有了答案： 深入克隆对象39个答案 可能使用反射来实现DeepClone作为基类的扩展方法。 如果您没有单个基类，则在接口上定义扩展方法并将其应用于基类。 一个更有趣的问题是为什么你想克隆整个对象图。 这是某种工厂模式吗？
This question already has an answer here: Deep cloning objects 39 answers Without more information it's hard to say exactly what's wrong, but ArrayList itself is serializable. However, if you are using a custom object you need to mark it as serializable for serialization to work. See: Serialize ArrayList of Objects Use a memory stream and binary formatter Something like `public T
这个问题在这里已经有了答案： 深入克隆对象39个答案 没有更多的信息，很难确切地说出错，但ArrayList本身是可序列化的。 但是，如果您正在使用自定义对象，则需要将其标记为可串行化才能正常工作。 请参阅：序列化对象的ArrayList 使用内存流和二进制格式化器就像 `public T Clone<T> (T obj) . { . using(var ms = new MemoryStream()) . { . var formatter = new BinaryFormatter();
Possible Duplicate: Cloning objects in C# My code : private void button1_Click(object sender, EventArgs e) { CopyForm(new Form1()); } public void CopyForm(Form form) { Form frm = form; frm.Text = "1"; form.Text = "2"; string c = frm.Text;// out 2 string c2 = form.Text;// out 2 } How to create object from Form without Ref ? Please show me the best way. Edit :
可能重复： 在C＃中克隆对象 我的代码： private void button1_Click(object sender, EventArgs e) { CopyForm(new Form1()); } public void CopyForm(Form form) { Form frm = form; frm.Text = "1"; form.Text = "2"; string c = frm.Text;// out 2 string c2 = form.Text;// out 2 } 如何从表单创建对象without Ref ？ 请给我看看最好的方法。 编辑： 请抽样。 您可以使用复制构造函
Possible Duplicate: Cloning objects in C# What I want to do is copy the values in a class from one object to another. Shallow Copy is just fine. However, I do not want to lose the reference that object has to the list /array/ienumerable. Also, I don't want to want to do this either: public static void EditEvent(EventModel editEvent) { EventModel changingEvent = EventRepository.get
可能重复： 在C＃中克隆对象 我想要做的是将一个类中的值从一个对象复制到另一个对象。 浅拷贝就好了。 但是，我不想丢失对象对list / array / enumerable 的引用 。 另外，我也不想这么做： public static void EditEvent(EventModel editEvent) { EventModel changingEvent = EventRepository.getEvent(editEvent.EventID); changingEvent.Subject = editEvent.Subject; changingEvent.EventDate = editEve
This question already has an answer here: Deep cloning objects 39 answers There is a much simpler way of cloning an object to another by using JSON serializer. This trick requires no modification or implementation of interfaces on the cloned class, just a JSON serializer like JSON.NET. public static T Clone<T>(T source) { var serialized = JsonConvert.SerializeObject(source); r
这个问题在这里已经有了答案： 深入克隆对象39个答案 使用JSON序列化程序将对象克隆到另一个对象有一种更简单的方法。 这个技巧不需要对克隆类的接口进行修改或实现，只需要像JSON.NET这样的JSON序列化器。 public static T Clone<T>(T source) { var serialized = JsonConvert.SerializeObject(source); return JsonConvert.DeserializeObject<T>(serialized); } 您可以使用此扩展方法来复制所有对象
This question already has an answer here: Deep cloning objects 39 answers Try using a copy constructor for each of your classes, that can clone all your fields. You might also want to introduce an interface, eg called IDeepCloneable , that forces classes to implement a method DeepClone() which calls the copy constructor. To get the cloning type-safe without casting you can use a self-refere
这个问题在这里已经有了答案： 深入克隆对象39个答案 尝试为每个类使用复制构造函数，以克隆所有的字段。 您可能还需要引入一个接口，例如称为IDeepCloneable的接口，该接口强制类实现调用复制构造函数的方法DeepClone() 。 为了克隆类型安全而不需要转换，可以使用自引用结构。 看看下面的内容： interface IDeepCloneable<out T> { T DeepClone(); } class SomeClass<T> : IDeepCloneable<T> w
This question already has an answer here: Deep cloning objects 39 answers I would use AutoMapper for this. Consider the following class definition: (note private ctor) public class Parent { public string Field1 { get; set; } public Level1 Level1 { get; set; } public static Parent GetInstance() { return new Parent() { Field1 = "1", Level1 = new Level1 { Field2 = "2",
这个问题在这里已经有了答案： 深入克隆对象39个答案 我会为此使用AutoMapper。 考虑以下班级定义：（note private ctor） public class Parent { public string Field1 { get; set; } public Level1 Level1 { get; set; } public static Parent GetInstance() { return new Parent() { Field1 = "1", Level1 = new Level1 { Field2 = "2", Level2 = new Level2() { Field3 = "3"}}}; } pr