静态&实例变量 [英] static & instance variables
问题描述
我有以下课程：
class ProvisionCollection
{
...
private int m_VarianceCount;
public int VarianceCount
{
get {return m_VarianceCount; }
}
public static ProvisionCollection GetProvisions（...）
{
ProvisionCollection list = new ProvisionCollection（）;
...填充集合...
m_VarianceCount =（int）cmd.Parameters [" @ SP_66_COUNT]。值;
返回列表;
}
}
我的问题：这种静态方法是否有权修改
私有实例变量m_VarianceCount？因为现在它
完美无缺，但它似乎不应该。
谢谢，
Jordan
Jordan Marr< jn **** @ hotmail.comwrote：
我有以下课程：
class ProvisionCollection
{
...
private int m_VarianceCount;
public int VarianceCount
{
get {return m_VarianceCount; }
}
public static ProvisionCollection GetProvisions（...）
{
ProvisionCollection list = new ProvisionCollection（）;
...填充集合...
m_VarianceCount =（int）cmd.Parameters [" @ SP_66_COUNT]。值;
返回列表;
}
}
我的问题：这种静态方法是否有权修改
私有实例变量m_VarianceCount？因为现在它
完美无缺，但它似乎不应该。
不，它不应该。这应该会给编译时错误。
你能发一个简短但完整的程序我们可以编译显示
以上工作吗？
请参阅 http：//www.pobox。 com / ~siget / csharp / complete.html 了解详情
我的意思是什么。
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet 博客： http： //www.msmvps.com/jon.skeet
如果回复该群组，请不要给我发邮件
5月10日下午3:34，Jon Skeet [C＃MVP]< s ... @ pobox.comwrote：
Jordan Marr< jnm ... @ hotmail.comwrote：
我有以下课程：
class ProvisionCollection
{
...
private int m_VarianceCount;
public int VarianceCount
{
get {return m_VarianceCount; } $ / $
}
public static ProvisionCollection GetProvisions（...）
{
ProvisionCollection list = new ProvisionCollection（）;
...填充集合...
m_VarianceCount = （int）cmd.Parameters [" @ SP_66_COUNT"]。值;
返回列表;
}
}
我的问题：这个静态方法是否有权修改
私有实例变量m_VarianceCount？因为现在它
完美无缺，但它似乎不应该。
不，它不应该。这应该会给编译时错误。
你能发一个简短但完整的程序我们可以编译显示
以上工作吗？
Seehttp：//www.pobox.com/~skeet/csharp/complete.html了解详情
我的意思是什么。
-
Jon Skeet - < s ... @ pobox.com> http://www.pobox.com/~skeet 博客： http://www.msmvps.com/jon.skeet
如果回复群组，请不要给我发邮件 - 隐藏引用的文字 -
- 显示引用的文字 -
我在C＃2.0中有另一个应用程序执行相同的操作但是，有些
类会编译，有些会抛出编译错误。同样的场景是
。
乔治
你能发布一个简短但完整的程序，我们可以编译显示
以上工作？
创建一个新的控制台应用并粘贴以下两个.cs模块：
使用系统;
名称空间Static_Bug
{
公共类TestClass
{
private string m_SecondName;
公共字符串SecondName
{
get {return m_SecondName; }
}
private int m_NameCount;
public int NameCount
{
get {return m_NameCount; } $ / b
}
public static TestClass Load（）
{
TestClass testClass = new TestClass （）;
string [] names = {" bob"，" john"，" sam" };
testClass.m_SecondName = names [1];
testClass.m_NameCount = names.Length;
返回testClass;
}
}
}
使用系统;
命名空间Static_Bug
{
公共类启动
{
public static void Main（）< br $>
{
TestClass testClass = TestClass.Load（）;
Console.WriteLine（string.Concat（" 2nd Name： \t"，
testClass.SecondName））;
Console.WriteLine（string.Concat（" Name Count：\t"，
testClass.NameCount））;
Console.ReadLine（）;
}
}
}
I have the following class:
class ProvisionCollection
{
...
private int m_VarianceCount;
public int VarianceCount
{
get { return m_VarianceCount; }
}
public static ProvisionCollection GetProvisions(...)
{
ProvisionCollection list = new ProvisionCollection();
... populate collection ...
m_VarianceCount = (int)cmd.Parameters["@SP_66_COUNT"].Value;
return list;
}
}
My question: Should this static method have access to modify the
private instance variable "m_VarianceCount"? Because right now it
works perfectly, but it doesn''t seem like it should.
Thanks,
Jordan
解决方案Jordan Marr <jn****@hotmail.comwrote:I have the following class:
class ProvisionCollection
{
...
private int m_VarianceCount;
public int VarianceCount
{
get { return m_VarianceCount; }
}
public static ProvisionCollection GetProvisions(...)
{
ProvisionCollection list = new ProvisionCollection();
... populate collection ...
m_VarianceCount = (int)cmd.Parameters["@SP_66_COUNT"].Value;
return list;
}
}
My question: Should this static method have access to modify the
private instance variable "m_VarianceCount"? Because right now it
works perfectly, but it doesn''t seem like it should.No, it shouldn''t. That should give a compile time error.
Could you post a short but complete program we can compile showing the
above working?
See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
On May 10, 3:34 pm, Jon Skeet [C# MVP] <s...@pobox.comwrote:Jordan Marr <jnm...@hotmail.comwrote:I have the following class:
class ProvisionCollection
{
...
private int m_VarianceCount;
public int VarianceCount
{
get { return m_VarianceCount; }
}
public static ProvisionCollection GetProvisions(...)
{
ProvisionCollection list = new ProvisionCollection();
... populate collection ...
m_VarianceCount = (int)cmd.Parameters["@SP_66_COUNT"].Value;
return list;
}
}
My question: Should this static method have access to modify the
private instance variable "m_VarianceCount"? Because right now it
works perfectly, but it doesn''t seem like it should.
No, it shouldn''t. That should give a compile time error.
Could you post a short but complete program we can compile showing the
above working?
Seehttp://www.pobox.com/~skeet/csharp/complete.htmlfor details of
what I mean by that.
--
Jon Skeet - <s...@pobox.com>http://www.pobox.com/~skeet Blog:http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too- Hide quoted text -
- Show quoted text -I had another app in C# 2.0 that did the same thing, however, some
classes would compile and some would throw a compile error. It was
the same scenerio.
Jordan
Could you post a short but complete program we can compile showing theabove working?
Create a new console app and paste the following two .cs modules:
using System;
namespace Static_Bug
{
public class TestClass
{
private string m_SecondName;
public string SecondName
{
get { return m_SecondName; }
}
private int m_NameCount;
public int NameCount
{
get { return m_NameCount; }
}
public static TestClass Load()
{
TestClass testClass = new TestClass();
string[] names = {"bob", "john", "sam" };
testClass.m_SecondName = names[1];
testClass.m_NameCount = names.Length;
return testClass;
}
}
}
using System;
namespace Static_Bug
{
public class Startup
{
public static void Main()
{
TestClass testClass = TestClass.Load();
Console.WriteLine(string.Concat("2nd Name:\t",
testClass.SecondName));
Console.WriteLine(string.Concat("Name Count:\t",
testClass.NameCount));
Console.ReadLine();
}
}
}
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