如何查找实现接口并调用方法的所有对象 [英] How to find all objects that implement a interface and invoke a method

问题描述

我有一个UserControl，有几个子UserControl，而那些UserControl都有子UserControl.

I have a UserControl that have a few child UserControl's and those UserControl's have child UserControl's.

考虑一下:

MainUserControl
  TabControl
    TabItem
      UserControl
        UserControl
          UserControl : ISomeInterface
    TabItem
      UserControl
        UserControl
          UserControl : ISomeInterface
    TabItem
      UserControl
        UserControl
          UserControl : ISomeInterface
    TabItem
      UserControl
        UserControl
          UserControl : ISomeInterface

这是我到目前为止所拥有的，但是没有找到ISomeInterface:

This is what i have so far, but finds no ISomeInterface:

PropertyInfo[] properties = MainUserControl.GetType().GetProperties();
foreach (PropertyInfo property in properties)
{
    if (typeof(ISomeInterface).IsAssignableFrom(property.PropertyType))
    {
        property.GetType().InvokeMember("SomeMethod", BindingFlags.InvokeMethod, null, null, null);
    }
}

是否有可能这样找到通过反射实现ISomeInterface的MainUserControl的所有子UserControl，并在该接口上调用方法(void SomeMethod())?

Is it possible so find all the child UserControl's from MainUserControl that implement ISomeInterface via reflection and call a method(void SomeMethod()) on that interface?

推荐答案

您将需要递归地遍历MainUserControl中的所有子控件.

You will need to recursively iterate through all the subcontrols within your MainUserControl.

以下是您可以使用的帮助方法:

Here's a helper method you can use:

/// <summary>
/// Recursively lists all controls under a specified parent control.
/// Child controls are listed before their parents.
/// </summary>
/// <param name="parent">The control for which all child controls are returned</param>
/// <returns>Returns a sequence of all controls on the control or any of its children.</returns>

public static IEnumerable<Control> AllControls(Control parent)
{
    if (parent == null)
    {
        throw new ArgumentNullException("parent");
    }

    foreach (Control control in parent.Controls)
    {
        foreach (Control child in AllControls(control))
        {
            yield return child;
        }

        yield return control;
    }
}

然后:

foreach (var control in AllControls(MainUserControl))
{
    PropertyInfo[] properties = control.GetType().GetProperties();
    ... Your loop iterating over properties

或者(如果这样对您有用，那就更好了，因为它要简单得多):

Or (much better if this will work for you, since it's a lot simpler):

foreach (var control in AllControls(MainUserControl))
{
    var someInterface = control as ISomeInterface;

    if (someInterface != null)
    {
        someInterface.SomeMethod();
    }
}

或者，使用Linq(需要using System.Linq来做到这一点):

Or, using Linq (need a using System.Linq to do this):

foreach (var control in AllControls(MainUserControl).OfType<ISomeInterface>())
    control.SomeMethod();

这似乎是最好的. :)

Which seems best of all. :)

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