Question

我正在使用C＃属性网格添加新对象并更改特定对象的设置。我需要知道如何使用组件模型将变量传递给构造函数。原因是因为需要参数才能正确定义图表对象的初始值。

List<Chart> charts = new List<Chart>();
[Description("Charts")]
[Category("4. Collection Charts")]
[DisplayName("Charts")]
public List<Chart> _charts
{
    get { return charts; }
    set { charts = value ; }
}




public class Chart
{
    public static string collectionName = "";

     int chartPosition = GetMaxChartIndex(collectionName);
     [Description("Chart posiion in document")]
     [Category("Control Chart Settings")]
     [DisplayName("Chart Position")]
     public int _chartPosition
     {
         get { return chartPosition; }
         set { chartPosition = value; }
     }


    public Chart(string _collectionName)
    {
        collectionName = _collectionName;

    }
}

Answer 1

在向PropertyGrid选择对象之前，您可以为Chart类型声明自定义TypeDescriptionProvider：

...
TypeDescriptor.AddProvider(new ChartDescriptionProvider(), typeof(Chart));
...

这是自定义提供程序（您需要实现CreateInstance方法）：

public class ChartDescriptionProvider : TypeDescriptionProvider
{
    private static TypeDescriptionProvider _baseProvider = TypeDescriptor.GetProvider(typeof(Chart));

    public override object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args)
    {
        // TODO: implement this
        return new Chart(...);
    }

    public override IDictionary GetCache(object instance)
    {
        return _baseProvider.GetCache(instance);
    }

    public override ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance)
    {
        return _baseProvider.GetExtendedTypeDescriptor(instance);
    }

    public override string GetFullComponentName(object component)
    {
        return _baseProvider.GetFullComponentName(component);
    }

    public override Type GetReflectionType(Type objectType, object instance)
    {
        return _baseProvider.GetReflectionType(objectType, instance);
    }

    public override Type GetRuntimeType(Type reflectionType)
    {
        return _baseProvider.GetRuntimeType(reflectionType);
    }

    public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
    {
        return _baseProvider.GetTypeDescriptor(objectType, instance);
    }

    public override bool IsSupportedType(Type type)
    {
        return _baseProvider.IsSupportedType(type);
    }
}

C＃Property Grid Pass构造函数变量

1 个答案: