Html.Textbox 的 HTML Helper 扩展方法

Question

因此，我有一个 Html.CheckBoxFor() 方法的扩展方法，该方法使用户能够传递如下所示的权限数组：

<%= Html.CheckBoxForWithPermission(m => m.Current, new string[] { PERMISSIONS.hasICAdvanced }, new { @class = "economicTextBox", propertyName = "Current", onchange = "UseCurrent();UpdateField(this);" })%>

该方法如下所示：

public static MvcHtmlString CheckBoxForWithPermission<TModel>(
                                                          this HtmlHelper<TModel> htmlHelper,
                                                          Expression<Func<TModel, bool>> expression,
                                                          string[] permissions,
                                                          object htmlAttributes
                                                         )
        {
            foreach (string permission in permissions)
            {
                if (Chatham.Web.UI.Extranet.SessionManager.PhysicalUser.IsInRole(permission))
                {
                    // the user has the permission => render the checkbox
                    return htmlHelper.CheckBoxFor(expression, htmlAttributes);
                }
            }
            // the user has no permission => render a readonly checkbox
            var mergedHtmlAttributes = new RouteValueDictionary(htmlAttributes);
            mergedHtmlAttributes["disabled"] = "disabled";
            return htmlHelper.CheckBoxFor(expression, mergedHtmlAttributes);
        }

基本上，我想创建除了 Html.TextBox 之外完全相同的东西我们目前这样调用的方法：

<%= Html.TextBox("RateTimeStamp", Model.RateTimeStamp.HasValue ? Model.RateTimeStamp.Value.ToString("dd-MMM-yyyy") : "", new { @class = "economicTextBox", propertyName = "RateTimeStamp", onchange = "parseAndSetDt(this);", dataType = "Date" })%>

由于这个助手有点不同，我不太确定如何格式化该方法。

任何帮助将不胜感激。谢谢！

Answer 1

public static MvcHtmlString TextBoxForWithPermission<TModel>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, bool>> expression,
    string[] permissions,
    object htmlAttributes
)
{
    foreach (string permission in permissions)
    {
        if (Chatham.Web.UI.Extranet.SessionManager.PhysicalUser.IsInRole(permission))
        {
            // the user has the permission => render the textbox
            return htmlHelper.TextBoxFor(expression, htmlAttributes);
        }
    }

    // the user has no permission => render a readonly checkbox
    var mergedHtmlAttributes = new RouteValueDictionary(htmlAttributes);
    mergedHtmlAttributes["disabled"] = "disabled";
    return htmlHelper.TextBoxFor(expression, mergedHtmlAttributes);
}

然后：

<%= Html.TextBoxForWithPermission(
    x => x.RateTimeStamp, 
    new string[] { PERMISSIONS.hasICAdvanced }, 
    new { 
        @class = "economicTextBox", 
        propertyName = "RateTimeStamp", 
        onchange = "parseAndSetDt(this);", 
        dataType = "Date" 
    }
) %>

如果您想要具有可以使用非类型化助手的格式：

public static MvcHtmlString TextBoxWithPermission<TModel>(
    this HtmlHelper<TModel> htmlHelper,
    string name,
    object value,
    string[] permissions,
    object htmlAttributes
)
{
    foreach (string permission in permissions)
    {
        if (Chatham.Web.UI.Extranet.SessionManager.PhysicalUser.IsInRole(permission))
        {
            // the user has the permission => render the textbox
            return htmlHelper.TextBox(name, value, htmlAttributes);
        }
    }

    // the user has no permission => render a readonly checkbox
    var mergedHtmlAttributes = new RouteValueDictionary(htmlAttributes);
    mergedHtmlAttributes["disabled"] = "disabled";
    return htmlHelper.TextBox(name, value, mergedHtmlAttributes);
}

并像这样调用：

<%= Html.TextBoxWithPermission(
    "RateTimeStamp",
    Model.RateTimeStamp.HasValue 
        ? Model.RateTimeStamp.Value.ToString("dd-MMM-yyyy") 
        : "",
    new string[] { PERMISSIONS.hasICAdvanced }, 
    new { 
        @class = "economicTextBox", 
        propertyName = "RateTimeStamp", 
        onchange = "parseAndSetDt(this);", 
        dataType = "Date" 
    }
) %>