上一篇讲了复合控件的基础知识,本来接着要继续讲复合控件样式的使用,让我们暂时回到前面第五篇的时候,继续讨论关于属性方面的一些知识.
写第五篇的时候,我一步步的加上元数据(特性),使得设计时效果更加好,如对复杂属性应用以下特性,使属性浏览器支持扩展/折叠效果,使你更加容易编辑子属性,但接着我又遇到了问题,所以必须去解决
1.认识默认属性浏览器支持
让我们再认识一下属性,大家知道每个属性都是有类型的,最熟悉就是string,int这些类型了,vs2005属性浏览器对这些属性类型进行了识别,
如下例子
(1)table控件的Height属性,当你设置属性为字符串时,则提示错误信息
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch1.jpg)
(2)当属性类型为Color属性时,属性浏览器为你提供颜色选择器
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch2.jpg)
(3)当属性类型为枚举类型时,属性浏览器则支持下拉框选择
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch3.jpg)
(4)当类型是时间类型,属性浏览器则支持时间选择器
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch4.jpg)
通过上面,我们认识到属性浏览器默认会判别属性类型,当属性值跟属性类型不符时,则会提示错误信息.这里我们还认识到属性浏览器默认为一些属性类型提供了便利
2.属性表现形式的多样性
在定义控件属性时,可以直接这样定义,属性都为字符串形式
<asp:TextBox ID="TextBox1" runat="server"
Height="11" BackColor="Blue"
ForeColor="#FF8000">测试</asp:TextBox>
用代码表示则是这样,在后台代码中定义的属性类型必须相对应,BackColor必须为Color类型,否则则会出错,当在页面呈现时,则以字符串形式呈现.
protected void Page_Load(object sender, EventArgs e)
{
//TextBox1.BackColor = "blue";
TextBox1.BackColor = System.Drawing.Color.Red;
TextBox1.BackColor = System.Drawing.Color.FromName("blue");
}
通过上面,我们认识到属性类型需要转换,这里便要引出我们所要讲的话题,类型转换器.
例如,当BackColor="Blue" 时,则会激活一个类型转换器实例将字符串值转换成声明的类型(即将"blue"转换成Color类型,然后赋给BackColor.
.net类库中的基本类型和许多类型都有与其相关联的类型转换器.
一般常用的类型有String,Int,Boolean,DateTime,Enum等类型,其类型已默认与其相对应的类型转换器关联起来.
如
Color类默认关联的类型转换器System.Drawing.ColorConverter
FontInto类默认关联的类型转换器System.Drawing.FontConverter
类型转换器的基类为 System.ComponentModel.TypeConverter ,所有的类型转换器都从其派生.
下面我们再来看一个例子,
我们先定义一个复杂属性,用于测试
示例一
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace CustomComponents
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
7
public class Name
8
{
9
private string firstName;
10
private string lastName;
11
public String FirstName
12
{
13
get
14
{
15
return firstName;
16
}
17
set
18
{
19
firstName = value;
20
}
21
}
22![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
23
public String LastName
24
{
25
get
26
{
27
return lastName;
28
}
29
set
30
{
31
lastName = value;
32
}
33
}
34
}
35
}
再看aspx文件
其中我们输出了Label的几个属性,包括FontInfo这个复杂属性,并且实例化了上面定义的Name类
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
1
<%@ Page Language="C#" %>
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
<script runat="server">
6![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
7
void Page_Load(object sender, EventArgs e)
8
{
9
myLabel.Font.Bold = true;
10
myLabel.Font.Italic = false;
11
myLabel.Font.Name = "verdana";
12
myLabel.Font.Overline = false;
13
myLabel.Font.Size = 10;
14
myLabel.Font.Strikeout = false;
15
myLabel.Font.Underline = true;
16
17
Response.Write(myLabel.Font + "<br>");
18
Response.Write(Label1.Width);
19
Response.Write(Label1.BackColor+"<br>");
20
Response.Write(Label1.ForeColor + "<br>");
21![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
22
CustomComponents.Name n = new CustomComponents.Name();
23
n.FirstName = "张";
24
n.LastName = "三";
25
Response.Write(n);
26
}
27![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
28
</script>
29
<html xmlns="http://www.w3.org/1999/xhtml" >
30
<head id="Head1" runat="server">
31
<title>FontInfo Example</title>
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</head>
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<body>
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<form id="form1" runat="server">
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<h3>FontInfo Example</h3>
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<asp:Label id="myLabel"
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runat="server" >
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</asp:Label>
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<br />
40
<br />
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<asp:Label ID="Label1" Width="200px" runat="server" BackColor="#FF8080" Text="Label" ForeColor="Red"></asp:Label>
42
</form>
43
</body>
44
</html>
45![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
46
下面看看输出结果,如下图
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch5.jpg)
结果是将FontInfo属性和Color属性转换成字符串形式呈现,而我们自定义的Name属性只以其类型呈现,并未呈现其子属性值.
再来看看第一点 默认属性浏览器支持和第五篇 我们所定义的一个复杂属性CustomComponents.Address,
CustomComponents.Address属性同样存在着这样的问题,再对比一下FontInfo属性在 属性浏览器的支持,如下图
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch6.jpg)
---------------------------------------------------------------------------
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch7.jpg)
复杂属性CustomComponents.Address无法编辑,只读,而且显示的是其属性类型.
复杂属性Font则默认显示了子其属性的值(其默认只显示Names值和Size值,且为只读)
问题来了, 我们要根据需要为自定义属性实现类型转换器 .
3.自定义属性类型转换器
上面已经说明问题所在了,实现类型转换器,可以将属性类型和字符串类型之间相互转换.
下面我们就为解决这个问题而来了解类型转换器,我们还是以 第五篇 的那个例子来学习
在说第二点 属性表现形式的多样性 的时候已经说过了
类型转换器的基类为 System.ComponentModel.TypeConverter ,所有的类型转换器都从其派生.
下面以第五篇时的例子为基础
我们为Address实现了一个类型转换器,其实现了复杂属性代码的折叠,如下代码
[TypeConverter(typeof(ExpandableObjectConverter))]
public class Address
{
}
System.ComponentModel.ExpandableObjectConverter 类也是从TypeConverter类派生
所以当自定义复杂类型的类型转换器时,则可从ExpandableObjectConverter 类派生
如果你定义的属性不是复杂属性,则可以直接从TypeConverter类派生
(1) 值翻译的类型转换器
从TypeConverter类派生的自定义类型转换器则需要重写TypeConverter类几个方法,主要目的就是实现自定义属性类型与字符串值之间的转换.
你需要了解以下几个方法,这里我们就以Address属性为例子,这样来解释以下方法更好理解.
其实可以理解成一来一去的关系,Form,To,相互之间的转换,如下代码:
TypeDescriptor类的方法为静态方法,通过GetConverter方法获取类型转换器
然后通过TypeConverter类的ConvertFromString方法和ConvertToString相互转换类型.
示例二
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
public class AddressConverter : ExpandableObjectConverter
{
方法#region 方法
// 返回值能否将String类型转换为Address类型
//sourceType表示要转换的类型
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvertFrom(context, sourceType);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 返回值能否将Address类型转换为String类型
//sourceType表示要转换到的类型
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(string))
{
return true;
}
return base.CanConvertTo(context, destinationType);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//将String类型转换为Address类型
//value为要转换的类型
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture,
object value)
{
if (value == null)
{
return new Address();
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (value is string)
{
string s = (string)value;
if (s.Length == 0)
{
return new Address();
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string[] parts = s.Split(culture.TextInfo.ListSeparator[0]);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (parts.Length != 4)
{
throw new ArgumentException("Invalid Address", "value");
}
//返回指定类型转换器
TypeConverter stringConverter = TypeDescriptor.GetConverter(typeof(string));
return new Address((string)stringConverter.ConvertFromString(context, culture, parts[0]),
(string)stringConverter.ConvertFromString(context, culture, parts[1]),
(string)stringConverter.ConvertFromString(context, culture, parts[2]),
(string)stringConverter.ConvertFromString(context, culture, parts[3]));
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return base.ConvertFrom(context, culture, value);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//将Address类型转换为String类型
//value为要转换的类型
public override object ConvertTo(
ITypeDescriptorContext context,
CultureInfo culture, object value, Type destinationType)
{
if (value != null)
{
if (!(value is Address))
{
throw new ArgumentException(
"Invalid Address", "value");
}
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (destinationType == typeof(string))
{
if (value == null)
{
return String.Empty;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Address ad = (Address)value;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
TypeConverter stringConverter = TypeDescriptor.GetConverter(typeof(string));
return String.Join(culture.TextInfo.ListSeparator,
new string[]
{
stringConverter.ConvertToString(context, culture, ad.Street),
stringConverter.ConvertToString(context, culture, ad.City),
stringConverter.ConvertToString(context, culture, ad.State),
stringConverter.ConvertToString(context, culture, ad.Zip)
});
}
return base.ConvertTo(context, culture, value,
destinationType);
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
}
自定义好类型转换器后,要与属性相关联起来
[TypeConverter(typeof(AddressConverter))]
public class Address
{
public Address()
:
this(String.Empty, String.Empty,
String.Empty, String.Empty)
{ }
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Address(string street, string city,
string state, string zip)
{
this.street = street;
this.city = city;
this.state = state;
this.zip = zip;
}
.......
}
下面来看下效果,如下图,属性编辑器显示的CustomAddress不再显示其类型了,已将其转化为字符串形式了,如果你设置CustomAddress可写的话,就可以直接编辑CustomAddress属性,但其只有四个子属性,所以当大于5个时就会出错,且格式也不可以乱改,一般情况下都设置其只读.
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch8.jpg)
为了在页面上显示这个CustomAddress属性,还需要为Address类重写一下ToString方法,如下代码
方法#region 方法
public override string ToString()
{
return ToString(CultureInfo.CurrentCulture);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public virtual string ToString(CultureInfo culture)
{
return TypeDescriptor.GetConverter(typeof(Address)).ConvertToString(null, culture, this);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
#endregion
通过上面重写ToString方法后,输出的CustomAddress属性将不再是其类型,而是以字符串形式呈现,以下以
Response.Write方法输出Custom1.CustomAddress输出,如下图
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch9.jpg)
上面讲了最基本的值翻译类型转换器,希望对大家有帮助
(2)向“属性”窗口提供标准值列表的类型转换器
像省份这样的属性,为了方便用户填写,我们往往做成下拉框形式,一个省份里面又有城市,我们往往列出一部分,如果其中数据不符合用户要求的话,用户还可以自己输入,使用类型转换器转换器也可以做到这一点.
实现这一效果你需要重写以下方法,我们添加一个属性 喜欢的游戏的名称
因为属性为String类型,可以直接从StringConverter 派生
示例三
public class GameConverter : StringConverter
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
//返回此对象是否支持可以从列表中选取的标准值集
public override bool GetStandardValuesSupported(
ITypeDescriptorContext context)
{
return true;
}
//返回下拉框集合类
public override StandardValuesCollection
GetStandardValues(ITypeDescriptorContext context)
{
return new StandardValuesCollection(new string[]
{"传奇",
"魔兽世界",
"龙与地下城"});
}
//标准值的集合是否为独占列表
//默认为flase,为true则表示无法修改列表值
public override bool GetStandardValuesExclusive(
ITypeDescriptorContext context)
{
return false;
}
}
然后与相关属性关联起来
[TypeConverter(typeof(GameConverter))]
[Description("喜欢的游戏")]
public String Game
{
get
{
return game;
}
set
{
game = value;
}
}
好了,.下面我们看一下效果,如下图,你可以选择下拉框的值,也可以自己手动输入,跟枚举类型很相似,但枚举类型无法自己修改值.
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch10.jpg)
这一篇主要介绍了 类型转换器 的基本使用,希望对大家有所帮助,在写的同时我也学到了很多,讲的比较基础,什么时候我懂了可以再补充,水平有限呀.这一篇就写到这里,很高兴,我已经写到第9篇了,我会继续写下去的,也希望大家喜欢.
示例代码下载
参考文章
充分利用 .NET 框架的 PropertyGrid 控件
编写与.NET属性窗口交互的RAD组件
写第五篇的时候,我一步步的加上元数据(特性),使得设计时效果更加好,如对复杂属性应用以下特性,使属性浏览器支持扩展/折叠效果,使你更加容易编辑子属性,但接着我又遇到了问题,所以必须去解决
1.认识默认属性浏览器支持
让我们再认识一下属性,大家知道每个属性都是有类型的,最熟悉就是string,int这些类型了,vs2005属性浏览器对这些属性类型进行了识别,
如下例子
(1)table控件的Height属性,当你设置属性为字符串时,则提示错误信息
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch1.jpg)
(2)当属性类型为Color属性时,属性浏览器为你提供颜色选择器
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch2.jpg)
(3)当属性类型为枚举类型时,属性浏览器则支持下拉框选择
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch3.jpg)
(4)当类型是时间类型,属性浏览器则支持时间选择器
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch4.jpg)
通过上面,我们认识到属性浏览器默认会判别属性类型,当属性值跟属性类型不符时,则会提示错误信息.这里我们还认识到属性浏览器默认为一些属性类型提供了便利
2.属性表现形式的多样性
在定义控件属性时,可以直接这样定义,属性都为字符串形式
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
用代码表示则是这样,在后台代码中定义的属性类型必须相对应,BackColor必须为Color类型,否则则会出错,当在页面呈现时,则以字符串形式呈现.
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
通过上面,我们认识到属性类型需要转换,这里便要引出我们所要讲的话题,类型转换器.
例如,当BackColor="Blue" 时,则会激活一个类型转换器实例将字符串值转换成声明的类型(即将"blue"转换成Color类型,然后赋给BackColor.
.net类库中的基本类型和许多类型都有与其相关联的类型转换器.
一般常用的类型有String,Int,Boolean,DateTime,Enum等类型,其类型已默认与其相对应的类型转换器关联起来.
如
Color类默认关联的类型转换器System.Drawing.ColorConverter
FontInto类默认关联的类型转换器System.Drawing.FontConverter
类型转换器的基类为 System.ComponentModel.TypeConverter ,所有的类型转换器都从其派生.
下面我们再来看一个例子,
我们先定义一个复杂属性,用于测试
示例一
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
1
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
17
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
19
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20
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再看aspx文件
其中我们输出了Label的几个属性,包括FontInfo这个复杂属性,并且实例化了上面定义的Name类
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下面看看输出结果,如下图
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结果是将FontInfo属性和Color属性转换成字符串形式呈现,而我们自定义的Name属性只以其类型呈现,并未呈现其子属性值.
再来看看第一点 默认属性浏览器支持和第五篇 我们所定义的一个复杂属性CustomComponents.Address,
CustomComponents.Address属性同样存在着这样的问题,再对比一下FontInfo属性在 属性浏览器的支持,如下图
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复杂属性CustomComponents.Address无法编辑,只读,而且显示的是其属性类型.
复杂属性Font则默认显示了子其属性的值(其默认只显示Names值和Size值,且为只读)
问题来了, 我们要根据需要为自定义属性实现类型转换器 .
3.自定义属性类型转换器
上面已经说明问题所在了,实现类型转换器,可以将属性类型和字符串类型之间相互转换.
下面我们就为解决这个问题而来了解类型转换器,我们还是以 第五篇 的那个例子来学习
在说第二点 属性表现形式的多样性 的时候已经说过了
类型转换器的基类为 System.ComponentModel.TypeConverter ,所有的类型转换器都从其派生.
下面以第五篇时的例子为基础
我们为Address实现了一个类型转换器,其实现了复杂属性代码的折叠,如下代码
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System.ComponentModel.ExpandableObjectConverter 类也是从TypeConverter类派生
所以当自定义复杂类型的类型转换器时,则可从ExpandableObjectConverter 类派生
如果你定义的属性不是复杂属性,则可以直接从TypeConverter类派生
(1) 值翻译的类型转换器
从TypeConverter类派生的自定义类型转换器则需要重写TypeConverter类几个方法,主要目的就是实现自定义属性类型与字符串值之间的转换.
你需要了解以下几个方法,这里我们就以Address属性为例子,这样来解释以下方法更好理解.
其实可以理解成一来一去的关系,Form,To,相互之间的转换,如下代码:
TypeDescriptor类的方法为静态方法,通过GetConverter方法获取类型转换器
然后通过TypeConverter类的ConvertFromString方法和ConvertToString相互转换类型.
示例二
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自定义好类型转换器后,要与属性相关联起来
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下面来看下效果,如下图,属性编辑器显示的CustomAddress不再显示其类型了,已将其转化为字符串形式了,如果你设置CustomAddress可写的话,就可以直接编辑CustomAddress属性,但其只有四个子属性,所以当大于5个时就会出错,且格式也不可以乱改,一般情况下都设置其只读.
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch8.jpg)
为了在页面上显示这个CustomAddress属性,还需要为Address类重写一下ToString方法,如下代码
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通过上面重写ToString方法后,输出的CustomAddress属性将不再是其类型,而是以字符串形式呈现,以下以
Response.Write方法输出Custom1.CustomAddress输出,如下图
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch9.jpg)
上面讲了最基本的值翻译类型转换器,希望对大家有帮助
(2)向“属性”窗口提供标准值列表的类型转换器
像省份这样的属性,为了方便用户填写,我们往往做成下拉框形式,一个省份里面又有城市,我们往往列出一部分,如果其中数据不符合用户要求的话,用户还可以自己输入,使用类型转换器转换器也可以做到这一点.
实现这一效果你需要重写以下方法,我们添加一个属性 喜欢的游戏的名称
因为属性为String类型,可以直接从StringConverter 派生
示例三
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然后与相关属性关联起来
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/dot.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
好了,.下面我们看一下效果,如下图,你可以选择下拉框的值,也可以自己手动输入,跟枚举类型很相似,但枚举类型无法自己修改值.
![](https://www.cnblogs.com/images/cnblogs_com/clingingboy/ServerControl/ch9/ch10.jpg)
这一篇主要介绍了 类型转换器 的基本使用,希望对大家有所帮助,在写的同时我也学到了很多,讲的比较基础,什么时候我懂了可以再补充,水平有限呀.这一篇就写到这里,很高兴,我已经写到第9篇了,我会继续写下去的,也希望大家喜欢.
示例代码下载
参考文章
充分利用 .NET 框架的 PropertyGrid 控件
编写与.NET属性窗口交互的RAD组件