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CA1819：属性不应返回数组（代码分析） - .NET | Microsoft Learn

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CA1819:属性不应返回数组

项目

09/07/2023

5 个参与者

反馈

本文内容

属性

值

规则 ID

CA1819

标题

属性不应返回数组

类别

“性能”

修复是中断修复还是非中断修复

重大

在 .NET 8 中默认启用

否

原因

属性返回数组。

默认情况下，此规则仅查看外部可见的属性和类型，但这是可配置的。

规则说明

即使属性是只读的，该属性返回的数组也不受写入保护。若要使数组不会被更改，属性必须返回数组的副本。通常，用户不能理解调用这种属性的负面性能影响。具体来说，他们可能将索引属性作为属性使用。

如何解决冲突

要解决此规则的冲突，请将属性设置为方法或更改属性以返回集合。

何时禁止显示警告

可禁止显示从 Attribute 类派生的特性中由属性引发的警告。特性可以包含返回数组的属性，但不能包含返回集合的属性。

如果属性是数据传输对象 (DTO) 类的一部分，则可以禁止显示警告.

否则，请勿禁止显示此规则发出的警告。

抑制警告

如果只想抑制单个冲突，请将预处理器指令添加到源文件以禁用该规则，然后重新启用该规则。

#pragma warning disable CA1819

// The code that's violating the rule is on this line.

#pragma warning restore CA1819

若要对文件、文件夹或项目禁用该规则，请在配置文件中将其严重性设置为 none。

[*.{cs,vb}]

dotnet_diagnostic.CA1819.severity = none

有关详细信息，请参阅如何禁止显示代码分析警告。

配置代码以进行分析

使用下面的选项来配置代码库的哪些部分要运行此规则。

包含特定的 API 图面

可以仅为此规则、为适用的所有规则或为适用的此类别（性能）中的所有规则配置此选项。有关详细信息，请参阅代码质量规则配置选项。

包含特定的 API 图面

你可以根据代码库的可访问性，配置要针对其运行此规则的部分。例如，若要指定规则应仅针对非公共 API 图面运行，请将以下键值对添加到项目中的 .editorconfig 文件：

dotnet_code_quality.CAXXXX.api_surface = private, internal

示例冲突

下面的示例显示了与此规则发生冲突的属性：

public class Book

{

private string[] _Pages;

public Book(string[] pages)

{

_Pages = pages;

}

public string[] Pages

{

get { return _Pages; }

}

Public Class Book

Public Sub New(ByVal pages As String())

Me.Pages = pages

End Sub

Public ReadOnly Property Pages() As String()

End Class

若要解决此规则的冲突，请将属性设置为方法或更改属性以返回集合而不是数组。

将属性更改为方法

以下示例通过将属性更改为方法来解决冲突：

Public Class Book

Private _Pages As String()

Public Sub New(ByVal pages As String())

_Pages = pages

End Sub

Public Function GetPages() As String()

' Need to return a clone of the array so that consumers

' of this library cannot change its contents

Return DirectCast(_Pages.Clone(), String())

End Function

End Class

public class Book

{

private string[] _Pages;

public Book(string[] pages)

{

_Pages = pages;

}

public string[] GetPages()

{

// Need to return a clone of the array so that consumers

// of this library cannot change its contents

return (string[])_Pages.Clone();

}

更改属性以返回集合

以下示例通过更改属性以返回 System.Collections.ObjectModel.ReadOnlyCollection 来解决冲突：

public class Book

{

private ReadOnlyCollection _Pages;

public Book(string[] pages)

{

_Pages = new ReadOnlyCollection(pages);

}

public ReadOnlyCollection Pages

{

get { return _Pages; }

}

Public Class Book

Public Sub New(ByVal pages As String())

Me.Pages = New ReadOnlyCollection(Of String)(pages)

End Sub

Public ReadOnly Property Pages() As ReadOnlyCollection(Of String)

End Class

允许用户修改属性

你可能希望允许类的使用者修改属性。以下示例显示与此规则冲突的读/写属性：

public class Book

{

private string[] _Pages;

public Book(string[] pages)

{

_Pages = pages;

}

public string[] Pages

{

get { return _Pages; }

set { _Pages = value; }

}

Public Class Book

Public Sub New(ByVal pages As String())

Me.Pages = pages

End Sub

Public Property Pages() As String()

End Class

以下示例通过更改属性以返回 System.Collections.ObjectModel.Collection 来解决冲突：

Public Class Book

Public Sub New(ByVal pages As String())

Me.Pages = New Collection(Of String)(pages)

End Sub

Public ReadOnly Property Pages() As Collection(Of String)

End Class

public class Book

{

private Collection _Pages;

public Book(string[] pages)

{

_Pages = new Collection(pages);

}

public Collection Pages

{

get { return _Pages; }

}

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CA1819: Properties should not return arrays (code analysis) - .NET | Microsoft Learn

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CA1819: Properties should not return arrays

Article

09/05/2023

5 contributors

Feedback

In this article

Property

Value

Rule ID

CA1819

Title

Properties should not return arrays

CA1819: 属性不应返回数组 - 正确的替代方案是什么？ c# .net fxcop - Dev59

19: 属性不应返回数组 - 正确的替代方案是什么？ c# .net fxcop - Dev59标签列表CA1819: 属性不应返回数组 - 正确的替代方案是什么？c#.netfxcop1616我之前也遇到过这个FxCop规则，对于如何解决违例并不满意（thread1，thread2）。现在我又有了一个需要修复CA1819问题的案例。

具体来说，我有一个算法库，对曲线（x，y）进行一些分析计算，其中公共的“输入对象”是这样的：public class InputObject

{

public double[] X { get; set; }

public double[] Y { get; set; }

// + lots of other things well

}

在该库中，这个对象的X和Y属性通常使用索引，在数百个位置中使用。算法从未更改输入对象，但实际上即使更改也不应该影响结果。此外，.Length经常被调用。这是一个数学库，其中double[]是标准数据类型。无论如何，修复CA1819需要相当多的工作。

我考虑使用List，因为List支持索引，并且与数组非常相似，但我不确定这是否会减缓算法运行速度，或者FxCop是否会对这些列表满意。

用什么选项替换这些double[]属性最好呢？- Efrain2@skk，这就是问题链接到的“thread1”... - AakashM（请注意，您必须格式化角括号以使它们出现在文本中） - AakashM5个回答1313如果只是读取给外部使用且消费者不希望通过索引访问它，则最好具有公共的只读属性，其类型为IEnumerable<>，并带有添加和删除的方法访问器，这样您就不必将您的数组暴露给别人随意更改。如果需要访问索引，则将其公开为只读属性，其类型为IList<>，并可能返回一个只读实例，带有添加和删除等方法。这样，您保持了内部列表的封装性，并允许用户以只读方式访问它。- Mohamed Abed31感谢您的输入，这正是我所做的...特别是因为还有另一个FxCop规则（CA2227，http://msdn.microsoft.com/de-de/library/ms182327.aspx）强制我这样做。 ;) - Efrain1个人而言，如果我想向调用者暗示属性可能是惰性评估的，我只会使用IEnumerable。在OP的例子中可能不是这种情况，所以我更喜欢IList，由ReadOnlyCollection字段支持，如果列表应该是只读的。 - Joe就是这样，@Joe，这正是我想表达的 :) - Mohamed Abed回答链接22有时我认为FxCop有些夸张。

这完全取决于你要做什么，如果你正在编写一个需要安全性和非常干净的代码的复杂系统，你应该返回该数组的只读版本。

也就是说，像devdigital建议的那样将数组转换为IEnumerable，或者使用Mohamed Abed的好主意ImmutableArray，我更喜欢后者。

如果你正在编写需要高性能的软件...在C#中，没有比数组更好的性能了。

对于迭代和读取，数组可以更快。

如果性能真的很重要，我建议你忽略那个警告。

即使不太干净，返回只读数组仍然合法。

for (int i = 0; i < array.Length; ++i) { k = array[i] + 1; }

对于C＃中的大型数组来说，这非常快：它避免了数组边界检查。

它将表现得非常像编译后的C代码。

我一直希望在C＃中有一个“只读数组”类型 :) 但是我们没有希望看到它。

- Salvatore Previti3我一直希望C#中有一个“只读数组”类型 - ReadOnlyCollection在功能上等同于只读数组。 - Joe1绝对正确，但在性能方面不是那么明显，在JIT中，数组有特殊的“快捷方式”。 - Salvatore Previti2多年过去了，但我们终于拥有了它 - ReadOnlySpan - https://learn.microsoft.com/en-us/dotnet/api/system.readonlyspan-1?view=netcore-3.1 - apocalypse回答链接11根据您的链接所示：要修复此规则的违规情况，请将属性更改为方法或更改属性以返回集合。使用诸如List之类的集合对性能不应产生重大影响。- devdigital33FxCop也不喜欢List，更喜欢IList。请使用IList代替List。 - Joe谢谢Joe，我们不使用FxCop，但这很有道理。 - devdigital根据@Joe的说法，我认为将属性的返回值更改为IList不应对其他需要重新编译/更改的代码产生任何影响，并解决FxCop问题。 - S2S2回答链接00这里的大问题实际上并不在于您的库对值所做的操作（虽然这是一个潜在的问题，但更容易解决），而在于调用方可能对值所做的操作。如果您需要将它们视为不可变的，则需要确保库使用者不能在原始分配后更改其内容。此处的简单解决方法是创建一个接口，公开您的库使用的所有数组成员，然后创建一个不可变的包装器类，该类实现此接口以用于您的InputObject类。例如：

public interface IArray

{

int Length { get; }

T this[int index] { get; }

}

internal sealed class ImmutableArray : IArray

where T : struct

{

private readonly T[] _wrappedArray;

internal ImmutableArray(IEnumerable data)

{

this._wrappedArray = data.ToArray();

}

public int Length

{

get { return this._wrappedArray.Length; }

}

public T this[int index]

{

get { return this._wrappedArray[index]; }

}

public class InputObject

{

private readonly IArray _x;

private readonly IArray _y;

public InputObject(double[] x, double[] y)

{

this._x = new ImmutableArray(x);

this._y = new ImmutableArray(y);

}

public IArray X

{

get { return this._x; }

}

public IArray Y

{

get { return this._y; }

}

//...

}

如果T是可变的，那么您“不可变”数组内容中的元素仍然是可变的，但至少对于双精度类型，您是安全的。

- Nicole Calinoiu5使用已经存在于框架中的类似IList而不是创建自己的接口（IArray）似乎有些过度设计。 - Joe1@Joe：IList公开了修改列表的操作。可以添加、删除和替换项目。当然，可以为每个变异点抛出NotSupportedException，但这不是对API使用者的特别礼貌的方式。而且，添加一个接口有多麻烦呢？ - Nicole Calinoiu它还有一个属性IsReadOnly，允许调用者避免NotSupportedException。在.NET中处理这个的惯用方式是暴露一个只读的IList，可能由ReadOnlyCollection支持。您当前的实现有许多弱点，包括未能实现IEnumerable、ICollection和IList，这些都应该是数组类的预期。您可以花时间实现这些，但为什么要这样做，当框架已经包含了您所需的一切呢？ - Joe@Joe：这对API消费者来说是一件可怕的事情。有时候确实是必要的，但这并不是那种情况。遗憾的是BCL没有包括只读集合接口，但这并不意味着我们在想要提供不可变性时必须使用它提供的可变接口。(顺便说一句，我的示例不完整，因为它只是一个示例。它旨在展示核心方法，而不是完整的实现。) - Nicole Calinoiu所有的设计都是权衡取舍，包括在决定是使用具有布尔“能力”属性的单个接口还是多个接口时。在这种情况下，我认为BCL绝对正确，不应该有只读集合接口，原因无法在评论中说明。两种选择在某些情况下都可能产生负面影响，因此不能轻易地说其中一种是“可怕的”，而应该仔细评估所有的利弊得失——我相信BCL设计师在设计他们的API时已经这样做了。 - Joe回答链接00将数组[]改为IEnumerable：

public class InputObject

{

public IEnumerable X { get; set; }

public IEnumerable Y { get; set; }

// + lots of other things well

}

- Jhonny Ramirez Zeballos回答链接网页内容由stack overflow 提供, 点击上面的可以查看英文原文，原文链接相关问题28 属性不应返回数组5 AppDomain.AppendPrivatePath的替代方案是什么？6 Microsoft.Azure.WebJobs.Hosting.JobHostConfiguration的替代方案是什么？90 静态方法继承的正确替代方案是什么？12 WPF的替代方案是什么？3 CLS兼容的ulong属性的替代方案是什么？5 属性的替代方案是什么？5 CA1819: 属性不应返回数组。这个规则适用于其他对象吗？4 Request.IsLocal的替代方案是什么？3 System.Collections.ArrayList的替代方案是什么？© 2023 根据CC BY-SA 4.0 许可证授权京ICP备19056307

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北京首都国际机场电话:咨询电话：010-96158；停车场：010-64540814；失物招领：010-64598333；投诉电话：010-96158；临时身份证：010-64597459。地址:北京市顺义区机场西路简介:北京首都国际机场位于北京市东北侧六环内，距离市区中心的车程大约30公里，是全中国规模一流、运输繁忙的大型国际航空港。作为中国第一国门，这里也是全世界设施及服务极先进的机场之一，拥有十分高效、细致的航空服务。

机场目前共有三座航站楼，航站楼间有免费的摆渡车可以方便中转。而各航站楼内部，也有便捷的设施帮助旅客出行，Wifi覆盖、咨询问讯处、休息区、购物区、商务中心、儿童游乐区、行李寄存与搬运、特殊旅客便利设施等一应俱全，可以满足一般旅客所有的出行需求。

同时，机场开通了前往市区中心的地铁线和十几条大巴路线，还有通向天津、秦皇岛、唐山等津冀主要城市的直通班车，交通非常方便，旅客可以在此感受便捷、舒适的出行体验。南京禄口国际机场电话:咨询电话：025-96066；投诉电话：025-52480315；临时身份证：025-69820351；商务中心：025-52480278；停车场：025-52480167。地址:江苏省南京市江宁区禄口镇空港路简介:南京禄口国际机场，位于南京市江宁区禄口镇，是江苏省和南京市的门户，是国家主要干线机场、华东地区的主要货运机场，与上海虹桥机场、浦东机场互为备降机场，位列全国千万级大型机场行列，是国家大型枢纽机场、中国航空货物中心和快件集散中心，国家区域交通枢纽。距市区约36公里，拥有通往54个国内主要城市、20个国际和3个地区城市的130余条航线。目前承载着中国国际航空、东方航空、南方航空、新加坡航空、德国汉莎航空、韩国韩亚航空等多家航空公司航班。

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邻近航班SC5125CA1817ZH1817KN6075MU2862MU2812CA1847ZH1847G56898MF3416KN6065CA1561ZH1561MU2832SC5057CA1503ZH1503MU2842KN6069ZH4865CA8601SC5295CA1819ZH1819SC5127

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Air China flight CA1819 - Flightradar24

Map Misc Labels appear when there are less than 400 aircraft on map. The second to fourth row will appear only when the map is zoomed in.Map styleTerrain TerrainRoadmapGreyscaleRadar (blue)Radar (dark)Aubergine (dark)SatelliteHybridBlack/WhiteBrightnessDay/night line Personalized ads Show times in local airport time rather than UTC.UnitsLocal airport time 12-hour clockTemperature°C Celsius °CFarenheit °F Aircraft speedKnots KnotsKm/hMphVertical speedFpm FpmM/s Wind speedKnots KnotsKm/hMphM/s AltitudeFeet FeetMetersDistanceKm KmMilesNm Reset all settings

Flight Tracker Map

Aviation Data

Flights

CA1819

Flight history for Air China flight CA1819 GREAT CIRCLE DISTANCE AVERAGE FLIGHT TIME ACTUAL FLIGHT TIME AVERAGE ARRIVAL DELAY FROM TO TIME UTC CALIBRATED ALTITUDE GPS ALTITUDE GROUND SPEED TRUE AIRSPEED VERTICAL SPEED INDICATED AIRSPEED TRACK SQUAWK AIRCRAFT REGISTRATION SERIAL NUMBER (MSN)

FLIGHTS HISTORY DATEFROMTOAIRCRAFTFLIGHT TIMESTDATDSTASTATUS — 15 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 15 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 14 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 14 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 13 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 13 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 12 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 12 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 11 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 11 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 10 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 10 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 09 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 09 Mar 2024 Beijing (PEK) Nanjing (NKG) 32Q — 12:30 — 14:10 Scheduled Play — 08 Mar 2024 - Scheduled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 08 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Scheduled Play — 07 Mar 2024 - Canceled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 07 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Canceled Play B-1417 06 Mar 2024 1:30 Landed 14:05 STD 12:30 ATD 12:35 STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 06 Mar 2024 Beijing (PEK) Nanjing (NKG) B738 (B-1417) 1:30 12:30 12:35 14:10 Landed 14:05 KML CSV Play B-5343 05 Mar 2024 1:29 Landed 14:24 STD 12:30 ATD 12:56 STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 05 Mar 2024 Beijing (PEK) Nanjing (NKG) B738 (B-5343) 1:29 12:30 12:56 14:10 Landed 14:24 KML CSV Play — 04 Mar 2024 - Canceled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 04 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Canceled Play B-1416 03 Mar 2024 1:28 Landed 14:07 STD 12:30 ATD 12:39 STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 03 Mar 2024 Beijing (PEK) Nanjing (NKG) B738 (B-1416) 1:28 12:30 12:39 14:10 Landed 14:07 KML CSV Play — 02 Mar 2024 - Canceled STD 12:30 ATD — STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 02 Mar 2024 Beijing (PEK) Nanjing (NKG) 738 — 12:30 — 14:10 Canceled Play B-6792 01 Mar 2024 1:26 Landed 14:33 STD 12:30 ATD 13:07 STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 01 Mar 2024 Beijing (PEK) Nanjing (NKG) A321 (B-6792) 1:26 12:30 13:07 14:10 Landed 14:33 KML CSV Play B-5803 29 Feb 2024 1:29 Landed 14:23 STD 12:30 ATD 12:54 STA 14:10 FROM Beijing (PEK) TO Nanjing (NKG) 29 Feb 2024 Beijing (PEK) Nanjing (NKG) B737 (B-5803) 1:29 12:30 12:54 14:10 Landed 14:23 KML CSV Play More than 7 days of CA1819 history is available with an upgrade to a Silver (90 days), Gold (1 year), or Business (3 years) subscription. 7-day FREE trial | Learn more © 2024 Flightradar24 ABContact usFAQCareersPrivacyTerms

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c# - CA1819: Properties should not return arrays. Does this happen only with arrays? If yes, why? - Software Engineering Stack Exchange

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Air China CA1819 Flight Status: Beijing to Nanjing Tracker | Trip.com

China CA1819 Flight Status: Beijing to Nanjing Tracker | Trip.comHotelsFlightsTrainsCarsCar RentalsAirport TransfersAttractions & ToursBundle & SaveDestinationsTrip.com RewardsDealsHelpCA1819 Flight StatusWednesday, March 6Thursday, March 7Friday, March 8CancelledAir China CA18192h 0minScheduled: Mar 7CancelledScheduled: Mar 720:3022:10Scheduled: 20:302h 0minScheduled: 22:10Beijing Beijing Capital International Airport T3Nanjing Nanjing Lukou International Airport T1Mar 6Mar 8Late arrival? Rest early by staying at a hotel near Nanjing Lukou International Airport!Search HotelsHotel Promo CodeCopy the promo code and use it to receive a 8% discount when booking hotels on Trip.com154 leftView Promo CodeD8Flight got cancelled? Book an alternate flight to Nanjing:Book NowLow-Cost Return FlightsFlight history for CA1819Hotels in NanjingPopular FlightsTrip.com>Flights>Flights to Nanjing>Flights from Beijing to Nanjing>CA1819Hotels in NanjingIn-flight AmenitiesBoeing 737-800Age11y, 1mSeatsUp To 166Distance Flown--EconomyBusinessAmenitiesNoneDrop-down ceiling TVsWi-Fi is unavailableNo power outlets are availableSeat Information--Legroom--Seat Width100°Reclining Angle3-3Seat Layout ExampleAmenitiesNoneDrop-down ceiling TVsWi-Fi is unavailableNo power outlets are availableSeat Information97 cmMore legroom than on 38% of flights--Seat Width120°Reclining Angle2-2Seat Layout ExampleComparison data is taken by comparing seats with others on the same flight route and in the same classFlight got cancelled? Book an alternate flight to Nanjing:Beijing (PKX)Nanjing (NKG)Fri, Mar 8One way21% OFFUS$74From US$58Beijing (PKX)Nanjing (NKG)Thu, Mar 7One way21% OFFUS$74From US$58Book NowLow-Cost Return FlightsNanjing (NKG)Beijing (PKX)Sat, Mar 9One way37% OFFUS$100From US$63Nanjing (NKG)Beijing (PKX)Wed, Mar 13One way37% OFFUS$100From US$63Nanjing (NKG)Beijing (PKX)Fri, Mar 8One way37% OFFUS$100From US$63Nanjing (NKG)Beijing (PKX)Sun, Mar 10One way23% OFFUS$100From US$77Nanjing (NKG)Beijing (PKX)Mon, Mar 11One way23% OFFUS$100From US$77Nanjing (NKG)Beijing (PKX)Tue, Mar 12One way21% OFFUS$100From US$79Flight history for CA1819Flight info.DateAirportScheduled TimeActual TimeStatusDepartureArrivalDepartureArrivalDepartureArrivalCA1819Air ChinaThu, Mar 7PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:10--:----:--CancelledCA1819Air ChinaWed, Mar 6PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:1020:3522:04ArrivedCA1819Air ChinaTue, Mar 5PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:1020:5622:24ArrivedCA1819Air ChinaMon, Mar 4PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:10--:----:--CancelledCA1819Air ChinaSun, Mar 3PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:1020:3922:03ArrivedCA1819Air ChinaSat, Mar 2PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:10--:----:--CancelledCA1819Air ChinaFri, Mar 1PEKBeijing Capital International AirportNKGNanjing Lukou International Airport20:3022:1021:0722:31ArrivedSwipe to see moreHotels in NanjingIbis Hotel (Nanjing Confucius Temple)1.6 km from downtown, Nanjing4.5/5Excellent1863 ReviewsThe worldwide budget ibis hotels are owned by Accor hotels and offer more than 983 hotels in 58 countries. Beds feature high-tech bases and mattresses, fluffy pillows and soft duvets. Rooms feature all the standard amenities, a desk and either a double or two single beds. This chain offers extended breakfast times which run from 4:00 a.m. to midday.Last booked hour agoFrom US$25UrCove by HYATT Nanjing South Railway Station8.61 km from downtown, Nanjing4.6/5Outstanding3910 ReviewsThe UrCove by HYATT Nanjing South Railway Station provides a great place for travelers to relax after a busy day. Visitors to Nanjing will find that the UrCove by HYATT Nanjing South Railway Station is a fantastic accommodation choice. With Nanjing South Railway Station just 1km away and Nanjing Lukou International Airport only 33km away, transportation is very convenient. Being just minutes away from Nanjing South Railway Station Metro Station allows guests to explore the city with ease. In their spare time, guests can explore the hotel's surroundings. Guests of this Nanjing hotel can make use of the parking facilities. Our guests rate this hotel as one of the best hotels for cleanliness. For guests traveling on business, this hotel is consistently one of the most popular choices. Last booked hour agoFrom US$43Grand Yiju Hotel (Nanjing Xinjiekou center)0.37 km from downtown, Nanjing4.7/5Outstanding1985 ReviewsThe Grand Yiju Hotel (Nanjing Xinjiekou center) provides a great place for travelers to relax after a busy day. The Grand Yiju Hotel (Nanjing Xinjiekou center) offers a pleasant stay in Nanjing for those traveling for business or leisure. Boasting a convenient location, the hotel is just 4km from 中华门站 and 42km from Nanjing Lukou International Airport. The closest major public transportation, Xinjiekou Metro Station, is only 400m away. This hotel is located near many of Nanjing's attractions including Presidential Palace of Nanjing, Confucius Temple and Confucius Temple Qinhuai River Scenery Belt. In their spare time, guests can explore the hotel's surroundings. According to our guests, this hotel provides a very high level of service. This hotel is a popular accommodation for groups of friends traveling together. Last booked hour agoFrom US$40Ibis Styles Hotel (Nanjing South Railway Station North Square)7.92 km from downtown, Nanjing4.7/5Outstanding1068 ReviewsThe Ibis Styles Hotel (Nanjing South Railway Station North Square) provides a great place for travelers to relax after a busy day. The Ibis Styles Hotel (Nanjing South Railway Station North Square) offers a pleasant stay in Nanjing for those traveling for business or leisure. The hotel is only 500m from Nanjing South Railway Station and 34km from Nanjing Lukou International Airport, giving guests a number of convenient transportation options. Transportation around the city is also convenient, with Nanjing South Railway Station Metro Station within walking distance. This hotel makes a great place to kick back and relax after a long day of sightseeing. For those driving themselves, parking is provided on site. When it comes to Nanjing hotels, the Ibis Styles Hotel (Nanjing South Railway Station North Square) is highly regarded for its excellent facilities. Perfect for those working on the move, this hotel caters to a large number of business guests. Last booked hour agoFrom US$37Yilong Anyun Hotel (Nanjing South Railway Station)7.32 km from downtown, Nanjing4.5/5Excellent204 ReviewsThe Yilong Anyun Hotel Nanjing South Station is located at No. 88 Yulan Road, Yuhuatai District, Nanjing, adjacent to many large enterprises such as Shuntian, Huawei, ZTE, and Tongling in the Software Avenue High tech Industrial Zone. The transportation around the hotel is convenient, with walking distance to South Railway Station, South Station Long Distance Bus Station, Lukou Airport Subway Line, and the departure point of Lukou Airport Bus Nanjing South Station. The Yilong Anyun Hotel Nanjing South Station has various types of rooms and is equipped with a breakfast restaurant. The facilities are complete and the service is thoughtful, making it a convenient choice for you to go out.Last booked hour agoFrom US$25The Westin Nanjing Resort & Spa21.22 km from downtown, Nanjing4.7/5Outstanding1456 ReviewsThe Westin Nanjing Resort & Spa is highly anticipated to open in June 2021. Located in Jiangsu Horticultural Exposition Park, undertaking the 11th Horticultural Exposition of Jiangsu Province and near the main exhibition hall, the hotel has 247 rooms, some of which are equipped with private hot-spring, 1,700 square meters of meeting space, an over 290 square meters of kids club and 4outlets including an all-day dining restaurant, a Chinese restaurant ,a lobby lounge and westin club, The design is an innovative display of traditional Chinese architecture that integrates modern design elements and catalyze the chemical effect of the collision between ancient and modern with a broad view, which not only adapts to the local conditions but also resonates with people’s sensibilities. This hotel delivers a new interpretation of lifestyle in Nanjing.Last booked hour agoFrom US$130Search More HotelsPopular FlightsPopular Routes Departing From BeijingPopular Routes Going to NanjingPopular AirlinesPopular hotelsRecommended for youNecessary Travel InformationFlights from Beijing to EvansvilleFlights from Beijing to New HavenFlights from Beijing to TonghuaFlights from Beijing to N'DjamenaFlights from Beijing to YichangFlights from Beijing to MumbaiFlights from Beijing to WeihaiFlights from Beijing to HanoiFlights from Beijing to HarbinFlights from Beijing to BahrainFlights from Beijing to MacauFlights from Beijing to BishkekFlights from Beijing to DaqingFlights from Beijing to Luang PrabangFlights from Beijing to ShenyangFlights from Beijing to TianjinFlights from Beijing to YueyangFlights from Beijing to ChangchunFlights from Beijing to TaipeiFlights from Beijing to Tel AvivFlights from Karachi to NanjingFlights from Jingdezhen to NanjingFlights from Hangzhou to NanjingFlights from Victoria to NanjingFlights from Macau to NanjingFlights from Shenzhen to NanjingFlights from Beijing to NanjingFlights from Bangkok to NanjingFlights from Riyadh to NanjingFlights from Guiyang to NanjingFlights from Wenzhou to NanjingFlights from Qingdao to NanjingFlights from Kilimanjaro to NanjingFlights from Agartala to NanjingPeople Express AirlinesRenfe ViajerosRyanairSkywest AirlinesAsky AirlinesEthiopian Airlines Flights to Punta CanaLoong Air Flights to Hong KongTurkish Airlines(TK) flights from Istanbul to BamakoCathay Pacific(CX) flights from Hong Kong to HobartCebu Pacific AirT'Way AirXining Sanyu HotelGrand Slam HotelCity Comfort Inn (Guangzhou Baiyun Mountain)Joy City Joy Hotel Shanghai BundGo Hotels Manila Airport RoadEden's Homes & Villas - Millennium Atria ResidencesMoxy Xi'an DowntownHampton by Hilton Shenzhen Futian PortQianshanji HotelTianwu Hotel (Xihua Road Rainbow Bridge Subway Station)Haus Bergere - Wohnung Kocher56 New Room HotelTorre Bertrana by Duquessa Hotel CollectionTreebo Trend the Lavit Malhar with Mountain View139 Seagull Avenue - HayboroughHotels near WildwoodHotels near Baltimore ZooHotels near Olympia TheatreHotels near Northern Kentucky Convention CenterHotels near Steel PierLuxury Hotels in BelfastLuxury Hotels in CairoLuxury Hotels in BrugesASTON Pluit Hotel & Residence ReviewsAruga Apartments by Rockwell ReviewsHotel Sunplaza ReviewsAbest Cube Naha Kokusai Street-Cabin Type Hotel All Room with Key ReviewsYongle Guqin Theme Inn ReviewsBali to Manila flight timeFlight Time from San Diego to Minneapolisflight time from Houston to SeattleFlight Time from Singapore to Ho Chi Minh CityCebu to Manila flight timeBangkok to Udon Thani flight timeUs-Bangla Airlines(BS) flights from Dhaka to Hong KongFlights from Beijing to BaliFlights from Bangkok to ShanghaiFlights from Baku to Abu DhabiFlights from Doha to ManilaFlights from Accra to EntebbeFlights from Bali to DiliFlights from HelsinkiFlights from Kozhikode to ManchesterDembi DoloFlights from Curitiba to Las VegasT6149 Flight Status TodayMU5515 Flight Status TodayFlights from Hong Kong International Airport to John F. 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CA1819:属性不应返回数组-腾讯云开发者社区-腾讯云

19:属性不应返回数组-腾讯云开发者社区-腾讯云呆呆CA1819:属性不应返回数组关注作者腾讯云开发者社区文档建议反馈控制台首页学习活动专区工具TVP最新优惠活动文章/答案/技术大牛搜索搜索关闭发布登录/注册首页学习活动专区工具TVP最新优惠活动返回腾讯云官网呆呆首页学习活动专区工具TVP最新优惠活动返回腾讯云官网社区首页 >专栏 >CA1819:属性不应返回数组CA1819:属性不应返回数组呆呆关注发布于 2022-02-19 18:59:305460发布于 2022-02-19 18:59:30举报文章被收录于专栏：centosDaicentosDai值规则 IDCA1819类别“性能”修复是中断修复还是非中断修复重大原因属性返回数组。默认情况下，此规则仅查看外部可见的属性和类型，但这是可配置的。规则说明即使属性是只读的，该属性返回的数组也不受写入保护。若要使数组不会被更改，属性必须返回数组的副本。通常，用户不能理解调用这种属性的负面性能影响。具体来说，他们可能将索引属性作为属性使用。如何解决冲突要解决此规则的冲突，请将属性设置为方法或更改属性以返回集合。何时禁止显示警告可禁止显示从 Attribute 类派生的特性中由属性引发的警告。特性可以包含返回数组的属性，但不能包含返回集合的属性。如果属性是数据传输对象 (DTO) 类的一部分，则可以禁止显示警告.否则，请勿禁止显示此规则发出的警告。配置代码以进行分析使用下面的选项来配置代码库的哪些部分要运行此规则。包含特定的 API 图面你可以仅为此规则、为所有规则或为此类别（性能）中的所有规则配置此选项。有关详细信息，请参阅代码质量规则配置选项。包含特定的 API 图面你可以根据代码库的可访问性，配置要针对其运行此规则的部分。例如，若要指定规则应仅针对非公共 API 图面运行，请将以下键值对添加到项目中的 .editorconfig 文件：dotnet_code_quality.CAXXXX.api_surface = private, internal示例冲突下面的示例显示了与此规则发生冲突的属性：public class Book{ private string[] _Pages; public Book(string[] pages) { _Pages = pages; } public string[] Pages { get { return _Pages; } }}Public Class Book Public Sub New(ByVal pages As String()) Me.Pages = pages End Sub Public ReadOnly Property Pages() As String()End Class若要解决此规则的冲突，请将属性设置为方法或更改属性以返回集合而不是数组。将属性更改为方法以下示例通过将属性更改为方法来解决冲突：Public Class Book Private _Pages As String() Public Sub New(ByVal pages As String()) _Pages = pages End Sub Public Function GetPages() As String() ' Need to return a clone of the array so that consumers ' of this library cannot change its contents Return DirectCast(_Pages.Clone(), String()) End FunctionEnd Classpublic class Book{ private string[] _Pages; public Book(string[] pages) { _Pages = pages; } public string[] GetPages() { // Need to return a clone of the array so that consumers // of this library cannot change its contents return (string[])_Pages.Clone(); }}更改属性以返回集合以下示例通过更改属性以返回 System.Collections.ObjectModel.ReadOnlyCollection 来解决冲突：public class Book{ private ReadOnlyCollection _Pages; public Book(string[] pages) { _Pages = new ReadOnlyCollection(pages); } public ReadOnlyCollection Pages { get { return _Pages; } }}Public Class Book Public Sub New(ByVal pages As String()) Me.Pages = New ReadOnlyCollection(Of String)(pages) End Sub Public ReadOnly Property Pages() As ReadOnlyCollection(Of String)End Class允许用户修改属性你可能希望允许类的使用者修改属性。以下示例显示与此规则冲突的读/写属性：public class Book{ private string[] _Pages; public Book(string[] pages) { _Pages = pages; } public string[] Pages { get { return _Pages; } set { _Pages = value; } }}Public Class Book Public Sub New(ByVal pages As String()) Me.Pages = pages End Sub Public Property Pages() As String()End Class以下示例通过更改属性以返回 System.Collections.ObjectModel.Collection 来解决冲突：Public Class Book Public Sub New(ByVal pages As String()) Me.Pages = New Collection(Of String)(pages) End Sub Public ReadOnly Property Pages() As Collection(Of String)End Classpublic class Book{ private Collection _Pages; public Book(string[] pages) { _Pages = new Collection(pages); } public Collection Pages { get { return _Pages; } }}相关规则CA1024:在适用处使用属性本文系外文翻译，前往查看如有侵权，请联系 cloudcommunity@tencent.com 删除。编程算法http本文系外文翻译，前往查看如有侵权，请联系 cloudcommunity@tencent.com 删除。编程算法http评论登录后参与评论0 条评论热度最新登录后参与评论推荐阅读LV.关注文章0获赞0领券社区专栏文章阅读清单互动问答技术沙龙技术视频团队主页腾讯云TI平台活动自媒体分享计划邀请作者入驻自荐上首页技术竞赛资源技术周刊社区标签开发者手册开发者实验室关于社区规范免责声明联系我们友情链接腾讯云开发者扫码关注腾讯云开发者领取腾讯云代金券热门产品域名注册云服务器区块链服务消息队列网络加速云数据库域名解析云存储视频直播热门推荐人脸识别腾讯会议企业云CDN加速视频通话图像分析MySQL 数据库SSL 证书语音识别更多推荐数据安全负载均衡短信文字识别云点播商标注册小程序开发网站监控数据迁移Copyright © 2013 - 2024 Tencent Cloud. All Rights Reserved. 腾讯云版权所有深圳市腾讯计算机系统有限公司 ICP备案/许可证号：粤B2-20090059 深公网安备号 44030502008569腾讯云计算（北京）有限责任公司京ICP证150476号 | 京ICP备11018762号 | 京公网安备号11010802020287问题归档专栏文章快讯文章归档关键词归档开发者手册归档开发者手册 Section 归档Copyright © 2013 - 2024 Tencent Cloud.All Rights Reserved. 腾讯云版权所有登录后参与评论00

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CA1819:属性不应返回数组-腾讯云开发者社区-腾讯云

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