C# 解析通过简单注入器注册的ASP.NET Web窗体图像控件派生类
我将向某个Web.UI.WebControls.Image派生类型中注入一个存储库实例:C# 解析通过简单注入器注册的ASP.NET Web窗体图像控件派生类,c#,asp.net,dependency-injection,webforms,simple-injector,C#,Asp.net,Dependency Injection,Webforms,Simple Injector,我将向某个Web.UI.WebControls.Image派生类型中注入一个存储库实例: public class CustomImageControl : Image { [Import] public ICachedNameRepository Repo { get; set; } // Null reference here private void DynamicImage_PreRender(object sender, EventArgs e) {
public class CustomImageControl : Image
{
[Import]
public ICachedNameRepository Repo { get; set; } // Null reference here
private void DynamicImage_PreRender(object sender, EventArgs e)
{
ImageUrl = {some ICachedNameRepository usage}
}
}
此外,这是我为测试目的而实现的默认页面:
public partial class _Default : Page
{
[Import]
public ICachedNameRepository Repo { get; set; } // Totally ok here
protected void Page_Load(object sender, EventArgs e)
{
{some ICachedNameRepository usage}
}
}
我已经根据使用控制注册而不是页面执行了容器引导:
private void BootStrapContainer()
{
var container = new Container();
container.Options.PropertySelectionBehavior = new ImportAttributePropertySelectionBehavior();
container.Register<ICachedNameRepository, CachedNameRepository>();
container.Register<CustomImageControl>(); // Also I have tried Control and Image types
container.Register<Page>();
var cc = container.GetInstance<CustomImageControl>(); // Correctly instantiated CachedNameRepository instance in Repo field in cc object
container.Verify(); // OK here
Global.Container = container;
}
private void BootStrapContainer()
{
var container=新容器();
container.Options.PropertySelectionBehavior=新的ImportAttributePropertySelectionBehavior();
container.Register();
container.Register();//我也尝试过控件和图像类型
container.Register();
var cc=container.GetInstance();//在cc对象的Repo字段中正确实例化了CachedNameRepository实例
container.Verify();//此处为OK
Global.Container=Container;
}
我将ControlInitializerModule、ImportAttributePropertySelectionBehavior和InitializeHandler例程完全复制到前面提到的指南中
在页面加载时,我最终得到了正确解析的默认页面实例,其中CachedNameRepository被注入了正确的位置,但是我的CustomImageControl遇到了空引用。这可以通过挂接
页面的InitComplete
事件来实现。这是我用来证明这一点的代码
我将CustomImageControl
更改为从UserControl
继承:
public partial class CustomImageControl : UserControl
{
[Import]
public ICachedNameRepository Repo { get; set; }
private void DynamicImage_PreRender(object sender, EventArgs e)
{
}
}
这是更新后的初始化Handler
public class Global : HttpApplication
{
private static Container container;
public static void InitializeHandler(IHttpHandler handler)
{
if (handler is Page)
{
Global.InitializePage((Page)handler);
}
}
private static void InitializePage(Page page)
{
container.GetRegistration(page.GetType(), true).Registration
.InitializeInstance(page);
page.InitComplete += delegate { Global.InitializeControl(page); };
}
private static void InitializeControl(Control control)
{
if (control is UserControl)
{
container.GetRegistration(control.GetType(), true).Registration
.InitializeInstance(control);
}
foreach (Control child in control.Controls)
{
Global.InitializeControl(child);
}
}
以及文档中的另外两个更改。确保在引导程序中调用注册表WebPages和控件
private static void RegisterWebPagesAndControls(Container container)
{
var pageTypes =
from assembly in BuildManager.GetReferencedAssemblies().Cast<Assembly>()
where !assembly.IsDynamic
where !assembly.GlobalAssemblyCache
from type in assembly.GetExportedTypes()
where type.IsSubclassOf(typeof(Page)) || type.IsSubclassOf(typeof(UserControl))
where !type.IsAbstract && !type.IsGenericType
select type;
pageTypes.ToList().ForEach(container.Register);
}
class ImportAttributePropertySelectionBehavior : IPropertySelectionBehavior
{
public bool SelectProperty(Type serviceType, PropertyInfo propertyInfo)
{
// Makes use of the System.ComponentModel.Composition assembly
return (typeof(Page).IsAssignableFrom(serviceType) ||
typeof(UserControl).IsAssignableFrom(serviceType)) &&
propertyInfo.GetCustomAttributes<ImportAttribute>().Any();
}
}
专用静态无效注册表WebPagesAndControls(容器)
{
变量页面类型=
从BuildManager.GetReferencedAssemblys().Cast()中的程序集
哪里!assembly.IsDynamic
哪里!assembly.GlobalAssemblyCache
来自程序集中的类型。GetExportedTypes()
其中type.IsSubclassOf(typeof(Page))| | type.IsSubclassOf(typeof(UserControl))
其中!type.isastract&!type.IsGenericType
选择类型;
pageTypes.ToList().ForEach(container.Register);
}
类ImportAttributePropertySelectionBehavior:IPropertySelectionBehavior
{
public bool SelectProperty(类型serviceType,PropertyInfo PropertyInfo)
{
//使用System.ComponentModel.Composition程序集
return(typeof(Page).IsAssignableFrom(serviceType)||
typeof(UserControl).IsAssignableFrom(serviceType))&&
propertyInfo.GetCustomAttributes().Any();
}
}
如果在public static void InitializeHandler(IHttpHandler handler)中添加断点
代码是否中断?@qujck execution不使用handler={ASP.default\u aspx}输入方法我猜没有为每个用户调用PageInitializerModule
Control@qujck当我通过向CustomImageControl提供正确解析的ICachedNameRepository参数依赖项切换到构造函数注入时,但我不能继续使用该解决方案,因为ASP.NET需要用于web控件的无参数ctor。您的解决方案适合我。总而言之,这是关于您在InitializeHandler、InitiaizePage和InitiaizeControl部分中对registration.InitializeInstance方法所做的正确注册。我对这个想法的理解正确吗?@SergeyPrytkov;我还将typeof(UserControl)
添加到RegisterWebPagesAndControls
和ImportAttributePropertySelectionBehavior
中,以便容器知道它们。我已经知道这些部分,正确的初始化对于我来说至关重要。谢谢你的帮助!