在的CheckBoxList asp.net的MVC [英] checkboxlist in asp.net MVC

问题描述

我想创建asp.net mvc的视图中的CheckBoxList并希望显示工作日（星期一星期二，....）。我想保存由用户在数据库中选择的值（S）。我怎样才能在MVC2做到这一点。

I want to create a checkboxlist in asp.net mvc view and want to display week days (monday tuesday, ....). I want to save the value(s) selected by user in database. How can I do this in MVC2

有人建议我使用这里提到的枚举类型作为位标志：

Someone suggested me to use "Enumeration Types as Bit Flags" mentioned here:

http://msdn.microsoft.com/en-us/library/ cc138362.aspx

我如何使用它？

请提出解决方案。

推荐答案

是的，我会也建议在这种情况下枚举。

Yes i would also suggest an enum in this scenario.

下面是如何在ASP.NET MVC做到这一点：

Here is how you can do it in ASP.NET MVC:

您枚举应该是这样的（看你提供的链接）：

Your enum should look like this (see the link you provided):

[Flags]
public enum Days 
{
    Sunday = 0x1,
    Monday = 0x2,
    Tuesday = 0x4,
    Wednesday = 0x8,
    Thursday = 0x10,
    Friday = 0x20,
    Saturday = 0x40 
}

有关的可重用性目的，我创建了一个普通的HTML辅助，看起来像这样：

For reusability purposes I have created an generic html helper that looks like this:

public static IHtmlString CheckboxListForEnum<T>(this HtmlHelper html, string name, T modelItems) where T : struct
{
    StringBuilder sb = new StringBuilder();

    foreach (T item in Enum.GetValues(typeof(T)).Cast<T>())
    {
        TagBuilder builder = new TagBuilder("input");
        long targetValue = Convert.ToInt64(item);
        long flagValue = Convert.ToInt64(modelItems);

        if ((targetValue & flagValue) == targetValue)
            builder.MergeAttribute("checked", "checked");

        builder.MergeAttribute("type", "checkbox");
        builder.MergeAttribute("value", item.ToString());
        builder.MergeAttribute("name", name);
        builder.InnerHtml = item.ToString();

        sb.Append(builder.ToString(TagRenderMode.Normal));
    }

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

您可以使用相同的HTML帮助所有枚举类型。

You can use the same html helper for all enumeration types.

现在用于演示目的，让说你有一个这样的模型：

Now for demonstration purposes let say that you have a model like this:

public class TVShow
{
    public string Title { get; set; }

    public string Description { get; set; }

    public Days AvailableOn { get; set; }

}

控制器动作：

public ActionResult Show()
{
    var show = new TVShow
    {
        Title = "Late Late Show",
        AvailableOn = Days.Monday | Days.Friday
    };
    return View(show);
}

查看（强类型）：

<%: Model.Title %>

<%: Model.Description %>

<%: Html.CheckboxListForEnum<Days>("days", Model.AvailableOn)%>

这篇关于在的CheckBoxList asp.net的MVC的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！