将带有泛型参数的静态方法转换为泛型类

Question

我有以下html帮助方法:

public static MvcHtmlString CustomEditorFor<TModel, TProperty>(this HtmlHelper<TModel> helper,
        Expression<Func<TModel, TProperty>> expression, 
        EditorOptions options,
        object htmlAttributes)
{
}

我需要将它移动到以这种方式构造的帮助程序库中:

public class HtmlHelperExenion
{
    public static Custom(this HtmlHelper helper)
    {
        return new HelperFactory(helper);
    }
}

public class HelperFactory
{
    internal HtmlHelper HtmlHelper { get; set; }
    public HelperFactory(HtmlHelper htmlHelper)
    {
        this.HtmlHelper = htmlHelper;
    }

    public virtual EditorBuilder CustomEditorFor( parameters from static MvcHtmlString static method above go here)
    {
        return new EditorBuilder( parameters go here );
    }
}

我无法弄清楚如何构造我的HelperFactory类和EditorBuilder类构造函数来正确处理泛型.

这是我尝试过的,它不起作用:

public static HelperFactory<TModel, TProperty> Custom<TModel, TProperty>(this HtmlHelper<TModel> helper)
{
    return new HelperFactory<TModel, TProperty>(helper);
}

public class HelperFactory<TModel, TProperty> : HelperFactory
{
    public HtmlHelper<TModel> HtmlHelper { get; set; }

    public HelperFactory(HtmlHelper<TModel> htmlHelper)
        : base((HtmlHelper)htmlHelper)
    {
        this.HtmlHelper = htmlHelper;
    }

    public virtual EditorBuilder<TModel, TProperty> CustomEditorFor(Expression<Func<TModel, TProperty>> expression,
EditorOptions options,
object htmlAttributes)
    {
        return new EditorBuilder<TModel, TProperty>(this.HtmlHelper,
                   expression,
                   options,
                   htmlAttributes);
    }
}

public class EditorBuilder<TModel, TProperty>
{
    public EditorBuilder(HtmlHelper<TModel> helper,
        Expression<Func<TModel, TProperty>> expression,
        EditorOptions options,
        object htmlAttributes)
    {

    }

}

最终目标是能够以这种方式使用它:@ Html.Custom().CustomEditorFor(model => model.Property)

任何帮助将不胜感激.

Answer 1

你的情况并不遥远，只需将你的更改HelperFactory为 take in TModel，这样你就可以将它绑定到一个泛型HtmlHelper并制作CustomEditorFor泛型，这样它就可以接受任何TPropertyie

public class HelperFactory<TModel>
{
    public HelperFactory(HtmlHelper<TModel> htmlHelper)
    {
        this.HtmlHelper = htmlHelper;
    }

    public HtmlHelper<TModel> HtmlHelper { get; private set; }

    public virtual EditorBuilder<TModel, TProperty> CustomEditorFor<TProperty>(Expression<Func<TModel, TProperty>> expression, EditorOptions options, object htmlAttributes)
    {
        return new EditorBuilder<TModel, TProperty>(this.HtmlHelper,
                   expression,
                   options,
                   htmlAttributes);
    }
}

然后你需要做的就是更新扩展方法

public static class HtmlHelperExt
{
    public static HelperFactory<TModel> Custom<TModel>(this HtmlHelper<TModel> helper)
    {
        return new HelperFactory<TModel>(helper);
    }
}

所以对于像这样的模型

public class MyModel
{
    public int Id { get; set; }
    ...
}

用法看起来像

@model MyModel

@Html.Custom().CustomEditorFor(x => x.Id, EditorOptions.Option1, null)