在属性网格中使用字典 [英] Using a Dictionary in a propertygrid
本文介绍了在属性网格中使用字典的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想使用属性网格编辑键值(字符串、字符串)项目列表.当我使用 Dictionary
作为类型时,propertygrid 将显示一个 GUI,但它似乎没有启用",即.我无法添加任何项目.
I'd like to edit a list of key value(string, string) items using a propertygrid. When I use a Dictionary<string,string>
as type the propertygrid will show a GUI, but it does not seem "enabled", ie. I can't add any items.
是否支持 Dictionary 对象,或者是否有任何其他对象可以解决这个问题?
Is the Dictionary object supported, or is there any other object with which I could solve this problem?
推荐答案
我已经按照 这段代码过去:
class DictionaryPropertyGridAdapter : ICustomTypeDescriptor
{
IDictionary _dictionary;
public DictionaryPropertyGridAdapter(IDictionary d)
{
_dictionary = d;
}
public string GetComponentName()
{
return TypeDescriptor.GetComponentName(this, true);
}
public EventDescriptor GetDefaultEvent()
{
return TypeDescriptor.GetDefaultEvent(this, true);
}
public string GetClassName()
{
return TypeDescriptor.GetClassName(this, true);
}
public EventDescriptorCollection GetEvents(Attribute[] attributes)
{
return TypeDescriptor.GetEvents(this, attributes, true);
}
EventDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetEvents()
{
return TypeDescriptor.GetEvents(this, true);
}
public TypeConverter GetConverter()
{
return TypeDescriptor.GetConverter(this, true);
}
public object GetPropertyOwner(PropertyDescriptor pd)
{
return _dictionary;
}
public AttributeCollection GetAttributes()
{
return TypeDescriptor.GetAttributes(this, true);
}
public object GetEditor(Type editorBaseType)
{
return TypeDescriptor.GetEditor(this, editorBaseType, true);
}
public PropertyDescriptor GetDefaultProperty()
{
return null;
}
PropertyDescriptorCollection
System.ComponentModel.ICustomTypeDescriptor.GetProperties()
{
return ((ICustomTypeDescriptor)this).GetProperties(new Attribute[0]);
}
public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
{
ArrayList properties = new ArrayList();
foreach (DictionaryEntry e in _dictionary)
{
properties.Add(new DictionaryPropertyDescriptor(_dictionary, e.Key));
}
PropertyDescriptor[] props =
(PropertyDescriptor[])properties.ToArray(typeof(PropertyDescriptor));
return new PropertyDescriptorCollection(props);
}
}
class DictionaryPropertyDescriptor : PropertyDescriptor
{
IDictionary _dictionary;
object _key;
internal DictionaryPropertyDescriptor(IDictionary d, object key)
: base(key.ToString(), null)
{
_dictionary = d;
_key = key;
}
public override Type PropertyType
{
get { return _dictionary[_key].GetType(); }
}
public override void SetValue(object component, object value)
{
_dictionary[_key] = value;
}
public override object GetValue(object component)
{
return _dictionary[_key];
}
public override bool IsReadOnly
{
get { return false; }
}
public override Type ComponentType
{
get { return null; }
}
public override bool CanResetValue(object component)
{
return false;
}
public override void ResetValue(object component)
{
}
public override bool ShouldSerializeValue(object component)
{
return false;
}
}
private void Form1_Load(object sender, System.EventArgs e)
{
IDictionary d = new Hashtable();
d["Hello"] = "World";
d["Meaning"] = 42;
d["Shade"] = Color.ForestGreen;
propertyGrid1.SelectedObject = new DictionaryPropertyGridAdapter(d);
}
对我们来说效果很好.
这篇关于在属性网格中使用字典的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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