改变 PropertyGrid 控件的编辑风格(4)——加入选择列表
张昱e-zhangyu@vip.sina.com
效果:
适用场合:
限制选择输入
步骤一:定义从UITypeEditor 继承的抽象类:ComboBoxItemTypeConvert。示例如下:
using System;
using System.Collections;
using System.ComponentModel;
namespace blog.csdn.net.zhangyuk
{
/// IMSTypeConvert 的摘要说明。
/// </summary>
public abstract class ComboBoxItemTypeConvert : TypeConverter
{
public Hashtable _hash = null;
public ComboBoxItemTypeConvert()
{
_hash = new Hashtable();
GetConvertHash();
}
public abstract void GetConvertHash();
public override bool GetStandardValuesSupported( ITypeDescriptorContext context )
{
return true;
}
public override StandardValuesCollection GetStandardValues(
ITypeDescriptorContext context)
{
int [] ids = new int [ _hash.Values.Count ];
int i=0;
foreach (DictionaryEntry myDE in _hash)
{
ids[i++] = (int)(myDE.Key);
}
return new StandardValuesCollection( ids );
}
public override bool CanConvertFrom( ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvertFrom(context, sourceType);
}
public override object ConvertFrom(
ITypeDescriptorContext context,
System.Globalization.CultureInfo culture,
object v )
{
if (v is string)
{
foreach (DictionaryEntry myDE in _hash)
{
if( myDE.Value.Equals((v.ToString())) )
return myDE.Key;
}
}
return base.ConvertFrom(context, culture, v);
}
public override object ConvertTo(
ITypeDescriptorContext context,
System.Globalization.CultureInfo culture, object v ,
Type destinationType)
{
if (destinationType == typeof(string))
{
foreach (DictionaryEntry myDE in _hash)
{
if( myDE.Key.Equals(v) )
return myDE.Value.ToString();
}
return "";
}
return base.ConvertTo(context, culture, v, destinationType);
}
public override bool GetStandardValuesExclusive(
ITypeDescriptorContext context)
{
return false;
}
}
}
步骤二:定义 ComboBoxItemTypeConvert 的派生类,派生类中实现父类的抽象方法:
public abstract void GetConvertHash();
示例如下:
using System;
using System.Collections;
using System.ComponentModel;
namespace blog.csdn.net.zhangyuk
{
public class PropertyGridBoolItem : ComboBoxItemTypeConvert
{
public override void GetConvertHash()
{
_hash.Add(0,"是");
_hash.Add(1,"否");
}
}
public class PropertyGridComboBoxItem : ComboBoxItemTypeConvert
{
public override void GetConvertHash()
{
_hash.Add(0,"炒肝");
_hash.Add(1,"豆汁");
_hash.Add(2,"灌肠");
}
}
}
步骤三:编辑属性类,指定编辑属性。示例如下:
namespace blog.csdn.net.zhangyuk
{
public class SomeProperties
{
private string _finished_time = "";
……
// 布尔
bool _bool = true;
[
Description("布尔"),
Category("属性"),
TypeConverter(typeof( PropertyGridBoolItem ))
]
public int 布尔
{
get { return _bool == true ? 0 : 1; }
set { _bool = (value == 0 ? true : false); }
}
// 选择列表
int _comboBoxItems = 0;
[
Description("选择列表"),
Category("属性"),
TypeConverter(typeof( PropertyGridComboBoxItem ))
]
public int 选择列表
{
get { return _comboBoxItems; }
set { _comboBoxItems = value; }
}
……
}
}
步骤四:设置PropertyGrid的属性对象。示例如下:
private void Form1_Load(object sender, System.EventArgs e)
{
this.propertyGrid1.SelectedObject = new SomeProperties();
}