Classes such as Stream , StreamReader , StreamWriter etc implements IDisposable interface. That means, we can call Dispose() method on objects of these classes. They've also defined a public method called Close() . Now that confuses me, as to what should I call once I'm done with objects? What if I call both? My current code is this: using (Stream responseStream = response.GetRespo
Stream ， StreamReader ， StreamWriter等类实现了IDisposable接口。 这意味着，我们可以在这些类的对象上调用Dispose()方法。 他们还定义了一个名为Close()的public方法。 现在让我感到困惑，至于在完成对象之后应该怎么称呼？ 如果我同时打电话怎么办？ 我目前的代码是这样的： using (Stream responseStream = response.GetResponseStream()) { using (StreamReader reader = new StreamReader(responseStream))
If I write a class in C# that implements IDisposable, why isn't is sufficient for me to simply implement public void Dispose(){ ... } to handle freeing any unmanaged resources? Is protected virtual void Dispose(bool disposing){ ... } always necessary, sometimes necessary, or something else altogether? It's not strictly necessary. It is part of the recommended Disposable pattern.
如果我用C＃编写实现IDisposable的类，为什么仅仅实现就不够用 public void Dispose(){ ... } 处理任何非托管资源？ 是 protected virtual void Dispose(bool disposing){ ... } 总是必要的，有时是必要的，或者其他什么东西？ 这不是绝对必要的。 它是推荐的一次性模式的一部分。 如果您还没有阅读关于此的框架设计指南部分（第一版中的9.3，没有第二版方便对不起），那么你应该。 试试这个链接。 这对区分一次性
I have a model with multiple fields in a .net core web app. The model is bound to a view, which uses asp-for tag helpers to render hidden inputs, text inputs, select lists and a text area. The issue.. On posting to the server, all inputs are bound correctly, except the text area. This is always coming through as null. Even more strangely, if I assign a value to the text area property bef
我有一个在.net核心Web应用程序中有多个字段的模型。 该模型绑定到视图，该视图使用asp-for标签助手来呈现隐藏的输入，文本输入，选择列表和文本区域。 问题.. 在发布到服务器上时，除文本区域外，所有输入均正确绑定。 这总是通过为空。 更奇怪的是，如果我在渲染视图之前为文本区域属性赋值，则该值将按预期显示在文本区域中（而不是奇怪的位），并且在发布到服务器时，该值将被回传。 但是，如果我尝试更改此值，尽
I'm trying to get all the data back after user fill the form but when i try to access model as a action parameter I always get model as null. Therefore i tried using FormCollection but still couldn't figure how can i access List of PossibleAnswerModels buried inside QuestionModel. Your help is very much appreciated UPDATE After reading Chris Pratt comment I updated everything to fol
我试图在用户填写表单后获取所有数据，但是当我尝试访问模型作为操作参数时，我总是将模型作为空值。 因此，我尝试使用FormCollection，但仍然无法计算如何访问埋在QuestionModel内的PossibleAnswerModel的列表。 非常感激你的帮助 UPDATE 在阅读Chris Pratt评论后，我将所有内容都更新为以下内容但我仍然无法获得TestModel的填充。 每次问题（TestModel测试，FormCollection formCollection）做POST索引操作得到调用我甚
I have a table of data in a razor view, to which I added a checkbox for each row in the table. I'm trying to return the checked list to my post action in the controller. However the model shows as null on post back. Model in view.. @model IPagedList<TrackerModel> Post actionResult in controller.... [HttpPost] public ActionResult Index(IList<TrackerModel> model)
我在剃刀视图中有一张数据表，我在表格中为每行添加了一个复选框。 我试图将检查的列表返回到控制器中的后置操作。 但是模型在帖子后面显示为空。 Model in view .. @model IPagedList<TrackerModel> 在控制器中发布actionResult .... [HttpPost] public ActionResult Index(IList<TrackerModel> model) { return View(model); } 表格标签在另一个表格中应用，因为表格在部分中
Ok, a similar question has being posted but I'm not seeing an answer that would apply to this scenario or the more likely, I'd fully understand the answer ! Basically I have a get ViewResult and Post ActionResult , the Get returns the correct model but when submitting, the model returns all properties as null ? Have user similar code in other methods and it works, can anyone see the pr
好的，一个类似的问题已经发布，但我没有看到一个适用于这种情况的答案，或者更可能的，我完全理解答案！ 基本上我有一个获得ViewResult和Post ActionResult，获取返回正确的模型，但提交时，模型返回所有属性为空？ 有其他方法用户类似的代码，它的工作原理，任何人都可以看到问题？ 仍在学习，所以请解释任何答案，谢谢。 [HttpGet] public ViewResult DeleteUser(string username) { IQueryRu
UPDATE: Jacco's suggestion (below) fixed this for me. Ie, ModelState.Clear() is your friend. I have a controller called ScheduleController with an ActionResult that looks like this: [HttpPost] public ActionResult Create(ScheduledCall scheduledcall) The scheduledCall model object has a property called content. I have a condition in which I would like to alter the value of the content pro
更新：Jacco的建议（下）为我解决了这个问题。 即，ModelState.Clear（）是你的朋友。 我有一个名为ScheduleController的控制器，它的ActionResult如下所示： [HttpPost] public ActionResult Create(ScheduledCall scheduledcall) scheduledCall模型对象有一个名为content的属性。 我有一个条件，我想更改content属性的值，并将模型返回到供用户在浏览器中阅读的视图。 我发现尽管更改属性的值很容易完成，但该视图不会
I have a text box users can enter search criteria. I also have a check box to filter out records. I want them to be able to search on the check box and not have to enter anything in the text box. Every time I leave the text box empty and hit Search, it return the focus to the text box and won't hit the controller. @using (Html.BeginForm("Index", "Ebooks")) { <div class="editor-labe
我有一个文本框用户可以输入搜索条件。 我也有一个复选框来过滤记录。 我希望他们能够在复选框上进行搜索，而不必在文本框中输入任何内容。 每次我将文本框留空并点击搜索时，它会将焦点返回到文本框，并且不会击中控制器。 @using (Html.BeginForm("Index", "Ebooks")) { <div class="editor-label"> Enter Author, ISBN, Title or Imprint </div> <div class="editor-field">
How does the Setters and Getters in C# implement Encapsulation? I am not new when it comes to these setters and getters, I have background with programming, specifically java. in java you use setters and getters like this public class Person { private String fName; public void setName(String someName) { fName = someName; } public String getName() { return fNam
C＃中的Setter和Getters如何实现封装？ 对于这些设置者和获取者，我并不陌生，我有编程背景，特别是java。 在Java中，你使用setter和getters这样的 public class Person { private String fName; public void setName(String someName) { fName = someName; } public String getName() { return fName; } } public class Test { public static void main(String[] args) {
How do you find the index of an element in a Collection inherited class? public class MyCollection : Collection<MyClass> { // implementation here } I tried to use .FindIndex on the collection but no success: int index = collectionInstance.FindIndex(someLambdaExpression); Any other ways to achieve this? If you have the element directly, you can use IndexOf to retrieve it. However,
你如何找到Collection继承类中元素的索引？ public class MyCollection : Collection<MyClass> { // implementation here } 我试图在集合上使用.FindIndex，但没有成功： int index = collectionInstance.FindIndex(someLambdaExpression); 任何其他方式来实现这一目标？ 如果您直接使用元素，则可以使用IndexOf来检索它。 但是，这不适用于通过lambda找到元素索引。 但是，您可以使用LINQ： var index = col