创建客户端 UI 自动化提供程序
更新：2007 年 11 月
本主题所包含的示例代码演示如何实现客户端 UI 自动化提供程序。
示例
下面的示例代码可内置于 动态链接库 (DLL) 中，从而实现一个非常简单的控制台窗口客户端提供程序。此代码没有任何有用的功能，只是用于演示建立可通过 UI 自动化客户端应用程序注册的提供程序程序集的基本步骤。
using System;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
namespace ClientSideProviderAssembly
{
// The assembly must implement a UIAutomationClientSideProviders class,
// and the namespace must be the same as the name of the DLL, so that
// UI Automation can find the table of descriptors. In this example,
// the DLL would be "ClientSideProviderAssembly.dll"
static class UIAutomationClientSideProviders
{
/// <summary>
/// Implementation of the static ClientSideProviderDescriptionTable field.
/// In this case, only a single provider is listed in the table.
/// </summary>
public static ClientSideProviderDescription[] ClientSideProviderDescriptionTable =
{
new ClientSideProviderDescription(
// Method that creates the provider object.
new ClientSideProviderFactoryCallback(ConsoleProvider.Create),
// Class of window that will be served by the provider.
"ConsoleWindowClass")
};
}
class ConsoleProvider : IRawElementProviderSimple
{
IntPtr providerHwnd;
public ConsoleProvider(IntPtr hwnd)
{
providerHwnd = hwnd;
}
internal static IRawElementProviderSimple Create(
IntPtr hwnd, int idChild, int idObject)
{
// This provider doesn't expose children, so never expects
// nonzero values for idChild.
if (idChild != 0)
return null;
else
return new ConsoleProvider(hwnd);
}
private static IRawElementProviderSimple Create(
IntPtr hwnd, int idChild)
{
// Something is wrong if idChild is not 0.
if (idChild != 0) return null;
else return new ConsoleProvider(hwnd);
}
#region IRawElementProviderSimple
// This is a skeleton implementation. The only real functionality
// at this stage is to return the name of the element and the host
// window provider, which can supply other properties.
ProviderOptions IRawElementProviderSimple.ProviderOptions
{
get
{
return ProviderOptions.ClientSideProvider;
}
}
IRawElementProviderSimple IRawElementProviderSimple.HostRawElementProvider
{
get
{
return AutomationInteropProvider.HostProviderFromHandle(providerHwnd);
}
}
object IRawElementProviderSimple.GetPropertyValue(int propertyId)
{
if (propertyId == AutomationElementIdentifiers.NameProperty.Id)
return "Custom Console Window";
else
return null;
}
object IRawElementProviderSimple.GetPatternProvider(int iid)
{
return null;
}
#endregion IRawElementProviderSimple
}
}