c# PropertyGrid 自定义多层显示 示例
时间: 2023-09-14 20:05:57 浏览: 122
C#实现ProperTyGrid自定义属性的方法
首先,我们需要创建一个自定义类来作为 PropertyGrid 的对象。这个类可以包含多个属性以及子属性。例如:
```c#
public class Person
{
public string Name { get; set; }
public int Age { get; set; }
public Address Address { get; set; }
}
public class Address
{
public string Street { get; set; }
public string City { get; set; }
public string State { get; set; }
}
```
接下来,我们需要创建一个自定义的 PropertyDescriptor 类,用于控制 PropertyGrid 的显示方式。这个类需要继承自 PropertyDescriptor 类,并重写几个方法,包括 GetValue()、SetValue()、CanResetValue()、ResetValue()、ShouldSerializeValue() 等方法。例如:
```c#
public class NestedPropertyDescriptor : PropertyDescriptor
{
private PropertyDescriptor _parent;
private PropertyDescriptor _child;
public NestedPropertyDescriptor(PropertyDescriptor parent, PropertyDescriptor child)
: base(child.Name, null)
{
_parent = parent;
_child = child;
}
public override object GetValue(object component)
{
object parentValue = _parent.GetValue(component);
if (parentValue == null)
return null;
return _child.GetValue(parentValue);
}
public override void SetValue(object component, object value)
{
object parentValue = _parent.GetValue(component);
if (parentValue == null)
return;
_child.SetValue(parentValue, value);
OnValueChanged(component, EventArgs.Empty);
}
public override bool CanResetValue(object component)
{
object parentValue = _parent.GetValue(component);
if (parentValue == null)
return false;
return _child.CanResetValue(parentValue);
}
public override void ResetValue(object component)
{
object parentValue = _parent.GetValue(component);
if (parentValue == null)
return;
_child.ResetValue(parentValue);
OnValueChanged(component, EventArgs.Empty);
}
public override bool ShouldSerializeValue(object component)
{
object parentValue = _parent.GetValue(component);
if (parentValue == null)
return false;
return _child.ShouldSerializeValue(parentValue);
}
public override Type ComponentType
{
get { return _parent.ComponentType; }
}
public override bool IsReadOnly
{
get { return _child.IsReadOnly; }
}
public override Type PropertyType
{
get { return _child.PropertyType; }
}
public override string DisplayName
{
get { return _child.DisplayName; }
}
}
```
最后,我们需要创建一个自定义的 TypeConverter 类,用于控制 PropertyGrid 的显示方式。这个类需要继承自 ExpandableObjectConverter 类,并重写几个方法,包括 GetProperties()、GetPropertiesSupported() 等方法。例如:
```c#
public class NestedTypeConverter : ExpandableObjectConverter
{
public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes)
{
PropertyDescriptorCollection properties = base.GetProperties(context, value, attributes);
List<PropertyDescriptor> nestedProperties = new List<PropertyDescriptor>();
foreach (PropertyDescriptor property in properties)
{
if (property.PropertyType.IsClass && property.PropertyType != typeof(string))
{
PropertyDescriptorCollection nestedProps = TypeDescriptor.GetProperties(property.PropertyType, new Attribute[] { new BrowsableAttribute(true) });
foreach (PropertyDescriptor nestedProp in nestedProps)
{
nestedProperties.Add(new NestedPropertyDescriptor(property, nestedProp));
}
}
else
{
nestedProperties.Add(property);
}
}
return new PropertyDescriptorCollection(nestedProperties.ToArray());
}
public override bool GetPropertiesSupported(ITypeDescriptorContext context)
{
return true;
}
}
```
最后,我们可以在窗体中使用 PropertyGrid 控件来显示我们自定义的类。例如:
```c#
private void Form1_Load(object sender, EventArgs e)
{
PropertyGrid1.SelectedObject = new Person
{
Name = "John",
Age = 30,
Address = new Address
{
Street = "123 Main St",
City = "Anytown",
State = "CA"
}
};
PropertyGrid1.BrowsableAttributes = new Attribute[] { new BrowsableAttribute(true) };
PropertyGrid1.ExpandAllGridItems();
}
```
以上就是 C# PropertyGrid 自定义多层显示的示例。希望能对你有所帮助。
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