Question

如何通过@<text></text>传递扩展方法？

我创建了这个扩展类：

public class CustomPanel
{
    public CustomPanel()
    {
        this.Fields = new List<string>();
    }

    private List<string> Fields { get; set; }

    public void AddField(string format)
    {
        this.Fields.Add(format);
    }

    public MvcHtmlString GetHtml()
    {
        var sb = new StringBuilder();

        foreach (var field in this.Fields)
            sb.AppendFormat("{0} <br>", field);

        return new MvcHtmlString(sb.ToString());
    }
}

public static class PanelExtension
{
    public static CustomPanel CreatePanel(this HtmlHelper html)
    {
        return new CustomPanel();
    }
}

当我打电话给方法时：

@{
    var panel = @Html.CreatePanel();
}

panel.AddField(@<text>
    @Html.LabelFor(model => model.BarCode)
    @Html.CheckBoxFor(model => model.BarCode)
</text>)

发生以下错误：

＆＃34;＆LT;＆＃34;在代码块的开头无效。只有标识符，关键字，评论＆＃34;（＆＃34;和＆＃34; {＆＃34;有效。

我该如何解决这个问题？

感谢。

Answer 1

我用更好的主意解决了这个问题。

我将表达式传递给方法，在里面我创建了html代码。

public class CustomField
{
    public CustomField(MvcHtmlString label, MvcHtmlString input)
    {
        this.Label = label;
        this.Input = input;
    }

    public MvcHtmlString Label { get; private set; }
    public MvcHtmlString Input { get; private set; }

    public override string ToString()
    {
        return string.Format("{0}{1}", this.Label, this.Input);
    }
}

public class CustomPanel<TModel>
{
    public CustomPanel(HtmlHelper<TModel> html)
    {
        if (html == null) throw new ArgumentNullException("html");

        this.Html = html;
        this.Fields = new List<CustomField>();
    }

    private HtmlHelper<TModel> Html { get; set; }
    private List<CustomField> Fields { get; set; }

    public void AddField<TValue>(Expression<Func<TModel, TValue>> expression)
    {
        this.Fields.Add(new CustomField(this.Html.LabelFor<TModel, TValue>(expression), this.Html.TextBoxFor<TModel, TValue>(expression)));
    }

    public MvcHtmlString GetHtml()
    {
        var sb = new StringBuilder();
        foreach (var field in this.Fields)
            sb.AppendFormat("{0} <br>", field);

        return new MvcHtmlString(sb.ToString());
    }
}

public static class PanelExtension
{
    public static CustomPanel<TModel> CreatePanel<TModel>(this HtmlHelper<TModel> html)
    {
        return new CustomPanel<TModel>(html);
    }
}

查看：

@{
    var panel = @Html.CreatePanel();
    panel.AddField(model => model.Reference);
    panel.AddField(model => model.Barcode);
}

@panel.GetHtml()

如何通过@ <text>传递扩展方法？</text>

1 个答案: