Is there a way to use a List like a selection-combobox in a propertyGrid?

For example, is it possible to have a class like this:

public class Foo
{
    [DisplayName(nameof(Sele,c#,propertygrid"/>
	














    

		

        

            
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首页  > 解决方案 > PropertyGrid --> 从列表中选择对象

Is there a way to use a List like a selection-combobox in a propertyGrid?



For example, is it possible to have a class like this:



public class Foo
{
    [DisplayName(nameof(Sele












c# - PropertyGrid --> 从列表中选择对象

Is there a way to use a List like a selection-combobox in a propertyGrid?



For example, is it possible to have a class like this:



public class Foo
{
    [DisplayName(nameof(Sele





问题描述



Is there a way to use a List like a selection-combobox in a propertyGrid?



For example, is it possible to have a class like this:



public class Foo
{
    [DisplayName(nameof(SelectedBar)),
    Browsable(true)]
    public Bar SelectedBar { get; set; } = null;

    [Browsable(false)]
    public List<Bar> Bars { get; set; } = new List<Bar>() { new Bar("Bar0"), new Bar("Bar1"), new Bar("Bar2") };
}

public class Bar
{
    public string Name;

    public Bar(string name) { Name = name; }

    public override string ToString()
    {
        return Name;
    }
}




And in propertyGrid let me select one of the objects in the List of "Bar".









Just to rephrase first. 



    

  • Get API A returns arrayA[ X, Y, Z] 
    • 

  • Get API B returns arrayB[M, Y, F]
    • 

  • View controller A shows array A
    • 

  • View controller B shows array B
    • 

  • Objects are not persisted
    • 




User modifies Y in View controller A, but view controller B does not show update. 



    

  • Option 1: Put all objects into one array and add a mechanism to know
which should be displayed in A and B view controllers
    • 

  • Option 2: When update in either array occurs, update other array if
element exists
    • 

  • Option 3: Get API A and Get API B handlers store results in arrayC or
dictionaryC, but also maintain arrayA and arrayB.  However A and B no
longer hold instances of objects, rather references to the objects in
arrayC or dictionaryC.  This is really just an implementation of
option 1.  I'd got with a dictionaryC where key is the uuid of the object stored in value, and array A & B just store keys.
    • 




Sure there are other options, like sending a notification so other view controller knows to refresh data. 



I don't think you should go down the road of keeping different instances in sync though.


标签： c#propertygrid


解决方案









好的，我找到了解决方案：



您需要一个带有静态对象列表变量的派生转换器类：



    public class ListStringConverter: StringConverter
    {
        public static List<object> Objects = new List<object>();

        public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
        {
            return true;
        }

        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
        {
            return new StandardValuesCollection(Objects);
        }
    }




并将带有转换器的 TypeConverter-Attribute 添加到您的 selectedObject 变量：



public class Foo
{
    public Foo()
    {
        ObjectListStringConverter.Objects = new List<object>(){ new Bar("Bar0"), new Bar("Bar1"), new Bar("Bar2") };
    }

    [DisplayName(nameof(SelectedBar)),
     Browsable(true),
     TypeConverter(typeof(ObjectListStringConverter))]
    public Bar SelectedBar { get; set; } = null;
}

public class Bar
{
    public string Name;

    public Bar(string name) { Name = name; }

    public override string ToString()
    {
        return Name;
    }
}




在某些时候，您需要用您希望在列表中拥有的对象填充转换器类的静态对象列表变量，就像我在上面的 Foo-Constructor 中所做的那样。



编辑：列表将显示您添加到列表中的每个对象的 ToString() 方法返回值。










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