在应用程序设置中存储自定义类型的问题 [英] problems with storing a custom type in application settings

问题描述

我已经在VS2005和C＃中使用了一段时间的应用程序设置，但

通常使用标准类型。我一直试图在应用程序设置中存储一个自定义的

容器/类/类型，我看到了不稳定的

结果。我知道一个已知的缺陷，用户类没有出现在

视觉设计器的Property / Settings页面上的类型列表中我想知道是否b $ b我遇到了一些其他特殊的问题，或者如果有正确使用它的技巧，那么就需要使用它。


我在Property / Settings页面上定义了我的设置选择浏览

然后输入我的班级名称myNamespace.InfoContainerList，这基本上是这样的：


public class InfoContainerList：List< InfoContainer>

{//空 - 只需要给列表命名。

}

公共类InfoContainer：ICloneable

{

private string configName;

private string configSetting;

private bool typeA;

private bool rememberPassword;

。 。 。

}


我首先让程序为这个设置生成一个值进入

user.config，然后我复制了将值设置为VS中的app.config，假设

它会将其传播到需要去的地方。当我重新打开

属性/设置页面时，它抱怨app.settings

中的值已更改为''''（空字符串）和我想把它转移到

设置文件中吗？事实上，Property / Settings页面上的值是一个空的
字符串。

对于我的第二次尝试，我进入了value字段，点击了省略号，

有一个值向导/构建器，让我在

左边添加InfoContainer实例，并为右边的每个字段赋值。我保存/关闭了物品

页面并重新打开...并得到了相同的投诉，价值字段又是空的。

/>
那么为自定义类型提供默认值的正确方法是什么呢？

它在需要的地方传播并且它粘住 ？

解决方案

嗨Michael，


至于.NET 2.0应用程序设置属性，如果你想要使用

自定义类/类型，你需要实现以下任意一种持久性

对于cstst类型的意思：


**为它提供TypeConverter（实现FromSTring和ToString）


**或者你可以使它成为XmlSerialiable


这里有一些web关于此问题的常见问题和讨论，您可以看看

以获得更多想法：


#Client设置常见问题
http://blogs.msdn.com/rprabhu/articles/433979.aspx


＃如何使用ApplicationSettingsBase保存自定义集合？
http://www.thescripts.com/forum/thread477600.html

此致，


Steven Cheng


Microsoft MSDN在线支持主管


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>来自：=？Utf-8？B？bWljaGFlbCBzb3JlbnM =？=< m _ ******** @ newsgroup.nospam>
主题：存储自定义的问题键入应用程序设置
日期：太阳，2007年12月30日14:27:00 -0800

我已经在VS2005和C＃中使用了应用程序设置一段时间，但
通常与标准类型。我一直试图在应用程序设置中存储自定义的容器/类/类型，我看到了不稳定的结果。我知道一个已知的缺陷，其中用户类没有显示

>可视化设计器中属性/设置页面上的类型列表和

I

> am想知道我是否遇到其他一些特殊问题，或者是否有

是

>只是技巧正确使用它。

我在Property / Settings页面上定义了我的设置，选择浏览
然后输入我的类名myNamespace.InfoContainerList，基本上是
就是这样：

公共类InfoContainerList：List< InfoContainer>
{//空 - 只需要为列表命名。
}
公共类InfoContainer：ICloneable
{

private string configName;

private string configSetting;

private bool typ eA;

private bool rememberPassword;

。 。 。

我首先让程序为
user.config生成此设置的值，然后将该设置值复制到VS中的app.config中，

假设

>它会将它传播到需要去的地方。当我重新打开
属性/设置页面时，它抱怨
中的值

app.settings

>已更改为''''（空字符串），我是否想要将其转换为
设置文件。事实上，Property / Settings页面上的值是

empty

> string 。
对于我的第二次尝试，我进入了值字段，点击了省略号，

和

>有一个值向导/构建器，让我在
上添加InfoContainer实例

> left，并为右边的每个字段赋值。我保存/关闭

房产

>页面并重新打开...并获得同样的抱怨，价值领域又是空的。

那么为自定义类型提供默认值的正确方法是什么呢？它会在需要的地方传播并且它粘住 ？

我明白你在说什么，但我观察到的并不完全同意

。如果没有TypeConverter或XmlSerializable，我就可以使它工作：一旦我在app.config中使用值编译，

应用程序就可以了。只有当我在VS中重新打开Property / Setting

页面时，我才有一些片状页面。行为。评论？

让我回到我之前跳过的问题：

Wdoing TypeConverter或XmlSerializable，我的app.config和

user.config文件在程序执行期间工作正常*。也就是说，我的

简单的InfoListContainer类...


公共类InfoContainerList：List< InfoContainer>

{//为空 - 只需要给名单命名。

}

公共类InfoContainer：ICloneable

{

private string configName;

private string configSetting;

private bool typeA;

private bool rememberPassword;

。 。 。

}


因此在user.config中作为一个组织良好的XML结构持续存在：


< setting名称= QUOT; ConfigList" serializeAs =" Xml">

< value>

< ArrayOfInfoContainer xmlns：xsi =" http：//www.w3.org/2001/XMLSchema -instance"

xmlns：xsd =" http：//www.w3.org/2001/XMLSchema">

< InfoContainer>

< ConnectionString>用户ID = foo;数据源= asb< / ConnectionString>

< ConfigName>默认< / ConfigName>

< DbType> SqlServer< ; / DbType>

< RememberPassword> false< / RememberPassword>

< / InfoContainer>

< InfoContainer>

< ConnectionString>用户ID =; Dsn = informaticaSource< / ConnectionString>

< ConfigName> myodbc< / ConfigName>

< DbType> Odbc< / DbType>

< RememberPassword> false< / RememberPassword>

< / InfoContainer>

< InfoContainer>

< ConnectionString>用户ID = a;数据源= asb< / ConnectionString>

< ConfigName> new-ora< / ConfigName>

< DbType> Oracle< / DbType>

< RememberPassword> false< / RememberPassword> ;

< / InfoContainer>

< / ArrayOfInfoContainer>

< / value>

< / setting>


我唯一的问题是我似乎无法在Property Designer的Settings

页面中设置默认值。如果你说它为什么它在运行时工作

不应该？为什么我有设计时间问题？


顺便说一句，我仍然没有在你的

未注释的代码示例中使用TypeConverter。除了字符串

" MySettingType"之外我需要更改什么？ ？如果这是唯一的事情，那肯定看起来像是一个非常好的b $ b klunky技术，必须为每个我想要的类重复相同的代码

才能坚持下去。

I have worked with application settings in VS2005 and C# for awhile, but
usually with standard types. I have been trying to store a custom
container/class/type in an application setting and I have seen erratic
results. I am aware of one known defect where user classes do not show up in
the list of types on the Property/Settings page in the visual designer and I
am wondering if I am encountering some other peculiar issue, or if there are
just tricks to using it properly.

I defined my setting on the Property/Settings page by selecting "browse"
then typing in my class name myNamespace.InfoContainerList, which is
basically just this:

public class InfoContainerList : List<InfoContainer>
{ // empty--just needed to give a name to the List.
}
public class InfoContainer : ICloneable
{
private string configName;
private string configSetting;
private bool typeA;
private bool rememberPassword;
. . .
}

I first let the program generate a value for this setting into the
user.config, then I copied that setting value into app.config in VS, assuming
it would propagate it to where it needed to go. When I re-opened the
Property/Settings page however, it complained that the value in app.settings
had changed to '''' (the empty string) and did I want to propage that to the
Settings file. The value on the Property/Settings page was, in fact, an empty
string.
For my second attempt, I went to the value field, clicked the ellipsis, and
got a value wizard/builder that let me add instances of InfoContainer on the
left, and give values to each field on the right. I saved/closed the Property
pages and re-opened... and got the same complaint, and the value field was
again empty.

So what is the proper way to provide a default value to a custom type so
that it propagates where it needs to and it "sticks" ?

解决方案

Hi Michael,

As for the .NET 2.0 application settings properties, if you want to use
custom class/type, you need to implement either of the following persistent
means for the c ustom type:

** provide a TypeConverter(implement FromSTring and ToString ) for it

** or you can make it XmlSerialiable

Here are some web FAQ and threads discussing on this, you may have a look
to get some further ideas:

#Client Settings FAQ
http://blogs.msdn.com/rprabhu/articles/433979.aspx

#How to save custom collections using ApplicationSettingsBase?
http://www.thescripts.com/forum/thread477600.html
Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

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--------------------

>From: =?Utf-8?B?bWljaGFlbCBzb3JlbnM=?= <m_********@newsgroup.nospam>
Subject: problems with storing a custom type in application settings
Date: Sun, 30 Dec 2007 14:27:00 -0800

I have worked with application settings in VS2005 and C# for awhile, but
usually with standard types. I have been trying to store a custom
container/class/type in an application setting and I have seen erratic
results. I am aware of one known defect where user classes do not show up

in

>the list of types on the Property/Settings page in the visual designer and

I

>am wondering if I am encountering some other peculiar issue, or if there

are

>just tricks to using it properly.

I defined my setting on the Property/Settings page by selecting "browse"
then typing in my class name myNamespace.InfoContainerList, which is
basically just this:

public class InfoContainerList : List<InfoContainer>
{ // empty--just needed to give a name to the List.
}
public class InfoContainer : ICloneable
{
private string configName;
private string configSetting;
private bool typeA;
private bool rememberPassword;
. . .
}

I first let the program generate a value for this setting into the
user.config, then I copied that setting value into app.config in VS,

assuming

>it would propagate it to where it needed to go. When I re-opened the
Property/Settings page however, it complained that the value in

app.settings

>had changed to '''' (the empty string) and did I want to propage that to the
Settings file. The value on the Property/Settings page was, in fact, an

empty

>string.
For my second attempt, I went to the value field, clicked the ellipsis,

and

>got a value wizard/builder that let me add instances of InfoContainer on

the

>left, and give values to each field on the right. I saved/closed the

Property

>pages and re-opened... and got the same complaint, and the value field was
again empty.

So what is the proper way to provide a default value to a custom type so
that it propagates where it needs to and it "sticks" ?

I understand what you are saying, but what I observed does not quite agree
with that. Without doing either a TypeConverter or XmlSerializable, I was
able to make it work: Once I compile with a value in app.config, the
application works just fine. It was only when I reopened the Property/Setting
page in VS that I had some "flaky" behavior. Comments?

Let me back up to my earlier question that you skipped:
Wdoing either a TypeConverter or XmlSerializable, my app.config and
user.config files are working *fine* during program execution. That is, my
simple InfoListContainer class...

public class InfoContainerList : List<InfoContainer>
{ // empty--just needed to give a name to the List.
}
public class InfoContainer : ICloneable
{
private string configName;
private string configSetting;
private bool typeA;
private bool rememberPassword;
. . .
}

persists as a nicely organized XML structure in user.config thusly:

<setting name="ConfigList" serializeAs="Xml">
<value>
<ArrayOfInfoContainer xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<InfoContainer>
<ConnectionString>User ID=foo;Data Source=asb</ConnectionString>
<ConfigName>Default</ConfigName>
<DbType>SqlServer</DbType>
<RememberPassword>false</RememberPassword>
</InfoContainer>
<InfoContainer>
<ConnectionString>User ID=;Dsn=informaticaSource</ConnectionString>
<ConfigName>myodbc</ConfigName>
<DbType>Odbc</DbType>
<RememberPassword>false</RememberPassword>
</InfoContainer>
<InfoContainer>
<ConnectionString>User ID=a;Data Source=asb</ConnectionString>
<ConfigName>new-ora</ConfigName>
<DbType>Oracle</DbType>
<RememberPassword>false</RememberPassword>
</InfoContainer>
</ArrayOfInfoContainer>
</value>
</setting>

My only issue is that I cannot seem to set a default value in the Settings
Page of the Property Designer. Why is it working at runtime if you say it
should not be? And why am I having design-time issues?

BTW, I still do not follow the use of the TypeConverter from your
uncommented code sample. What do I need to change except the string
"MySettingType" ? If that is the only thing, that sure seems like a very
klunky technique, to have to repeat the identical code for every class I want
to persist.

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