Question

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我试图使用Ninject来解析名为CategoryListBox和SubCategoryListBox的一对级联列表框中包含的项目，然后在单击SubCategoryListBox项目时延迟加载表单。

我有以下界面：

public interface ICategory
{
    string Caption { get; set; }
    ISubCategory[] SubCategories { get; set; }
}

public interface ISubCategory
{
    string Caption { get; set; }
    Lazy<ISubForm> SubForm { get; set; }
}

public interface ISubForm
{
    void Show();
}

我有以下＆＃34; Base＆＃34;类实现接口：

public class BaseCategory : ICategory
{
    public string Caption { get; set; }
    public ISubCategory[] SubCategories { get; set; }

    public BaseCategory(string caption, ISubCategory[] subCategories)
    {
        Caption = caption;
        SubCategories = subCategories;
    }
}

public class BaseSubCategory : ISubCategory
{
    public string Caption { get; set; }
    public Lazy<ISubForm> SubForm { get; set; }

    public BaseSubCategory(string caption, Lazy<ISubForm> subForm)
    {
        Caption = caption;
        SubForm = subForm;
    }
}

我有4＆＃34;混凝土＆＃34;用于实现ISubForm接口的表单如下：

 public partial class SubForm1A : Form, ISubForm {}
 public partial class SubForm1B : Form, ISubForm {}
 public partial class SubForm2A : Form, ISubForm {}
 public partial class SubForm2B : Form, ISubForm {}

我通过NuGet引用了Ninject和Ninject.Extensions.Factory，我的用法看起来像这样

 using Ninject;
 using Ninject.Extensions.Factory;

我的绑定语句如下所示：

        IKernel kernel = new StandardKernel();

        kernel.Bind<ICategory>().To<BaseCategory>().Named("Category 1").WithConstructorArgument("One");
        kernel.Bind<ISubCategory>().To<BaseSubCategory>().WhenParentNamed("Category 1").Named("SubCategory 1A").WithConstructorArgument("1A");
        kernel.Bind<ISubCategory>().To<BaseSubCategory>().WhenParentNamed("Category 1").Named("SubCategory 1B").WithConstructorArgument("1B");
        kernel.Bind<ISubForm>().To<SubForm1A>().WhenParentNamed("SubCategory 1A");
        kernel.Bind<ISubForm>().To<SubForm1B>().WhenParentNamed("SubCategory 1B");

        kernel.Bind<ICategory>().To<BaseCategory>().Named("Category 2").WithConstructorArgument("Two");
        kernel.Bind<ISubCategory>().To<BaseSubCategory>().WhenParentNamed("Category 2").Named("SubCategory 2A").WithConstructorArgument("2A");
        kernel.Bind<ISubCategory>().To<BaseSubCategory>().WhenParentNamed("Category 2").Named("SubCategory 2B").WithConstructorArgument("2B");
        kernel.Bind<ISubForm>().To<SubForm2A>().WhenParentNamed("SubCategory 2A");
        kernel.Bind<ISubForm>().To<SubForm2B>().WhenParentNamed("SubCategory 2B");

我按如下方式填充CategoryListBox数据源：

        List<ICategory> categories = kernel.GetAll<ICategory>().ToList<ICategory>();

        CategoryListBox.DataSource = categories;
        CategoryListBox.DisplayMember = "Caption";

当您双击CategoryListBox中的项目时，它会按如下方式填充SubCategoryListBox：

    private void CategoryListBox_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        ICategory selected = (ICategory)((ListBox)sender).SelectedItem;
        SubCategoryListBox.DataSource = selected.SubCategories;
        SubCategoryListBox.DisplayMember = "Caption";
    }

当您双击SubCategoryListBox中的项目时，我尝试延迟加载SubForm，这是当我遇到＆＃34;没有匹配的绑定可用时＃34;错误

    private void SubCategoryListBox_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        ISubCategory selected = (ISubCategory)((ListBox)sender).SelectedItem;
        selected.SubForm.Value.Show();
    }

我的目标是在单击SubCategoryListBox之前不实例化SubForms。

我很确定我会采用错误的方式进行，欢迎提出任何建议。

Answer 1

我能够通过将 ninject.extensions.contextpreservation 添加到我的参考资料来解决我的问题

没有匹配的绑定可用，并且在使用Lazy <t> </t>时类型不可自我绑定

1 个答案: