Asp.net mvc 3 MVC3定制HTMLHelper、局部视图或其他应用干燥原理的解决方案
我有一个MVC3只读视图,其中包含一个显示项目属性的表 对于项目的许多属性,我们跟踪供应商对项目所做的更改。因此,例如,供应商可能会将名为“Color”的属性值从“Blue”更新为“Red”。在此视图中,表列出了表行中跟踪的每个属性,其中一列显示“旧值”和“新值”。下一列显示当前更改的状态(等待批准、已批准或已拒绝)。但是,对于管理员用户,该列将包含链接(“批准”、“拒绝”或“重置为等待批准”) 我为此编写的标记和Razor代码非常重复,而且难以控制。我想为此创建一个HTMLHelper,或者可能创建一个局部视图,我可以使用该视图将所有代码移动到其中,然后将其用于每个Item属性 下面是一个用于一个属性的代码示例。对于另外10个左右的属性,重复此代码 我正在使用一些jquery和ajax进行操作。例如,当拒绝更改时,用户必须输入拒绝更改的原因Asp.net mvc 3 MVC3定制HTMLHelper、局部视图或其他应用干燥原理的解决方案,asp.net-mvc-3,razor,Asp.net Mvc 3,Razor,我有一个MVC3只读视图,其中包含一个显示项目属性的表 对于项目的许多属性,我们跟踪供应商对项目所做的更改。因此,例如,供应商可能会将名为“Color”的属性值从“Blue”更新为“Red”。在此视图中,表列出了表行中跟踪的每个属性,其中一列显示“旧值”和“新值”。下一列显示当前更改的状态(等待批准、已批准或已拒绝)。但是,对于管理员用户,该列将包含链接(“批准”、“拒绝”或“重置为等待批准”) 我为此编写的标记和Razor代码非常重复,而且难以控制。我想为此创建一个HTMLHelper,或者可
<tr id="rowId-color">
<td>@Html.LabelFor(model => model.Color)</td>
<td>@Html.DisplayFor(model => model.Color)</td>
@if (Model.ChangeLog != null && Model.ChangeLog.Item("Color") != null) {
var change = Model.ChangeLog.Item("Color");
var changeStatus = (ItemEnumerations.ItemChangeStatuses)change.ItemChangeStatusID;
<td>@change.OldValueDisplay</td>
<td id="tdstatusId-@change.ItemChangeID">
@if (changeStatus == ItemEnumerations.ItemChangeStatuses.AwaitingApproval && User.IsInRole("TVAPMgr")) {
@Ajax.ActionLink("Approve", "Approve", new { itemChangeID = change.ItemChangeID }, new AjaxOptions { HttpMethod = "POST", Confirm = "Approve this change?", OnSuccess = "actionCompleted" })
@Html.Raw("|")
<a href="#dialog" name="reject" data-id="@change.ItemChangeID" >Reject</a>
}
else if ((changeStatus == ItemEnumerations.ItemChangeStatuses.Rejected || changeStatus == ItemEnumerations.ItemChangeStatuses.Approved) && User.IsInRole("TVAPMgr")) {
@Ajax.ActionLink("Reset to Awaiting Approval", "Reset", new { itemChangeID = change.ItemChangeID }, new AjaxOptions { HttpMethod = "POST", Confirm = "Reset this change to Awaiting Approval?", OnSuccess = "actionCompleted" })
}
else {
@changeStatus.ToDisplayString()
}
</td>
<td id="tdreasonId-@change.ItemChangeID">@Html.DisplayFor(m => m.ChangeLog.Item(change.ItemChangeID).RejectedReason)</td>
}
else {
<td colspan="3">No Change</td>
}
</tr>
@LabelFor(model=>model.Color)
@DisplayFor(model=>model.Color)
@if(Model.ChangeLog!=null&&Model.ChangeLog.Item(“颜色”)!=null){
var change=Model.ChangeLog.Item(“颜色”);
var changeStatus=(ItemEnumerations.ItemChangeStatuses)change.ItemChangeStatusID;
@change.OldValueDisplay
@if(changeStatus==ItemEnumerations.ItemChangeStatuses.WaitingApproval&&User.IsInRole(“TVAPMgr”)){
@ActionLink(“批准”、“批准”,新建{itemChangeID=change.itemChangeID},新建AjaxOptions{HttpMethod=“POST”,Confirm=“批准此更改?”,OnSuccess=“actionCompleted”})
@Html.Raw(“|”)文件
}
如果((changeStatus==ItemEnumerations.ItemChangeStatuses.Rejected | | changeStatus==ItemEnumerations.ItemChangeStatuses.Approved)&&User.IsInRole(“TVAPMgr”){
@ActionLink(“重置为等待批准”,“重置”,新建{itemChangeID=change.itemChangeID},新建AjaxOptions{HttpMethod=“POST”,Confirm=“重置此更改为等待批准?”,OnSuccess=“actionCompleted”})
}
否则{
@changeStatus.ToDisplayString()
}
@DisplayFor(m=>m.ChangeLog.Item(change.ItemChangeID.RejectedReason)
}
否则{
不变
}
这听起来更像是ItemChangeModel
类型的显示模板,这样您就可以:
<tr id="rowId-color">
<td>@Html.LabelFor(model => model.Color)</td>
<td>@Html.DisplayFor(model => model.Color)</td>
@Html.DisplayFor(m => m.ChangeLog.Item("Color"))
</tr>
(很难在编辑器框中编码,这可能需要一些清理,但我想你会明白的)
您将此显示模板(文件名为ItemChangeModel.cshtml)添加到Views\Shared\DisplayTemplates文件夹中,每当对该类型进行DisplayFor调用时,都将使用该模板
注释中指出,您不能在DisplayFor中使用方法,但可以将其更改为索引属性:
public class ChangeLog
{
public ItemChangeModel this[string key] { get { return Item("Color"); } }
}
然后使用:
@Html.DisplayFor(m => m.ChangeLog["Color"])
您没有显示或解释域和视图模型的外观,但我怀疑您在这里使用的视图模型不适合视图的这种特定需求。更好的视图模型应该是具有要批准的属性列表的模型,这些属性列表将显示在表中 无论如何,一种可能的方法是编写一个自定义HTML帮助程序,使您的视图如下所示:
@model ItemChangeModel
@if(Model != null) {
<td>@Html.DisplayFor(m => m.OldValueDisplay)</td>
<td id="tdstatusId-@Model.ItemChangeID">
@switch((ItemEnumerations.ItemChangeStatuses) Model.ItemChangeStatusID) {
case ItemEnumerations.ItemChangeStatuses.AwaitingApproval:
if(User.IsInRole("TVAPMgr")) {
@Ajax.ActionLink("Approve", "Approve", new { itemChangeID = change.ItemChangeID }, new AjaxOptions { HttpMethod = "POST", Confirm = "Approve this change?", OnSuccess = "actionCompleted" })
@Html.Raw("|")
<a href="#dialog" name="reject" data-id="@change.ItemChangeID" >Reject</a>
}
break;
case ItemEnumerations.ItemChangeStatuses.Rejected:
case ItemEnumerations.ItemChangeStatuses.Approved:
if(User.IsInRole("TVAPMgr")) {
@Ajax.ActionLink("Reset to Awaiting Approval", "Reset", new { itemChangeID = change.ItemChangeID }, new AjaxOptions { HttpMethod = "POST", Confirm = "Reset this change to Awaiting Approval?", OnSuccess = "actionCompleted" })
} else {
@changeStatus.ToDisplayString()
}
@break;
}
</td>
<td id="tdreasonId-@change.ItemChangeID">@Html.DisplayFor(m => m.RejectedReason) </td>
} else {
<td colspan="3">No Change</td>
}
<tr id="rowId-color">
@Html.DisplayFor(x => x.Color)
@Html.ChangeLogFor(x => x.Color)
</tr>
...
@DisplayFor(x=>x.Color)
@ChangeLogFor(x=>x.Color)
...
而助手可能是以下几点:
public static class HtmlExtensions
{
public static IHtmlString ChangeLogFor<TProperty>(
this HtmlHelper<MyViewModel> html,
Expression<Func<MyViewModel, TProperty>> ex
)
{
var model = html.ViewData.Model;
var itemName = ((MemberExpression)ex.Body).Member.Name;
var change = model.ChangeLog.Item(itemName);
if (change == null)
{
return new HtmlString("<td colspan=\"3\">No Change</td>");
}
var isUserTVAPMgr = html.ViewContext.HttpContext.User.IsInRole("TVAPMgr");
var changeStatus = (ItemChangeStatuses)change.ItemChangeStatusID;
var sb = new StringBuilder();
sb.AppendFormat("<td>{0}</td>", html.Encode(change.OldValueDisplay));
sb.AppendFormat("<td id=\"tdstatusId-{0}\">", change.ItemChangeID);
var ajax = new AjaxHelper<MyViewModel>(html.ViewContext, html.ViewDataContainer);
if (changeStatus == ItemChangeStatuses.AwaitingApproval && isUserTVAPMgr)
{
sb.Append(
ajax.ActionLink(
"Approve",
"Approve",
new {
itemChangeID = change.ItemChangeID
},
new AjaxOptions {
HttpMethod = "POST",
Confirm = "Approve this change?",
OnSuccess = "actionCompleted"
}).ToHtmlString()
);
sb.Append("|");
sb.AppendFormat("<a href=\"#dialog\" name=\"reject\" data-id=\"{0}\">Reject</a>", change.ItemChangeID);
}
else if ((changeStatus == ItemChangeStatuses.Rejected || changeStatus == ItemChangeStatuses.Approved) && isUserTVAPMgr)
{
sb.Append(
ajax.ActionLink(
"Reset to Awaiting Approval",
"Reset",
new {
itemChangeID = change.ItemChangeID
},
new AjaxOptions {
HttpMethod = "POST",
Confirm = "Reset this change to Awaiting Approval?",
OnSuccess = "actionCompleted"
}
).ToHtmlString()
);
}
else
{
sb.Append(changeStatus.ToDisplayString());
}
sb.AppendLine("</td>");
sb.AppendFormat(
"<td id=\"tdreasonId-{0}\">{1}</td>",
change.ItemChangeID,
html.Encode(model.ChangeLog.Item(change.ItemChangeID).RejectedReason)
);
return new HtmlString(sb.ToString());
}
}
public静态类
{
公共静态IHtmlString ChangeLogFor(
这个HtmlHelper html,
表达式ex
)
{
var model=html.ViewData.model;
var itemName=((MemberExpression)ex.Body).Member.Name;
var change=model.ChangeLog.Item(itemName);
if(change==null)
{
返回新的HtmlString(“无更改”);
}
var isUserTVAPMgr=html.ViewContext.HttpContext.User.IsInRole(“TVAPMgr”);
var changeStatus=(ItemChangeStatuses)change.ItemChangeStatusID;
var sb=新的StringBuilder();
sb.AppendFormat(“{0}”,html.Encode(change.OldValueDisplay));
sb.AppendFormat(“,change.ItemChangeID”);
var ajax=新的AjaxHelper(html.ViewContext、html.ViewDataContainer);
if(changeStatus==ItemChangeStatuses.waitingApproval&&isUserTVAPMgr)
{
附加(
ajax.ActionLink(
“批准”,
“批准”,
新{
itemChangeID=change.itemChangeID
},
新的AjaxOptions{
HttpMethod=“POST”,
确认=“批准此更改?”,
OnSuccess=“actionCompleted”
}).ToHtmlString()
);
某人加上(“|”);
sb.AppendFormat(“,change.ItemChangeID”);
}
else if((changeStatus==项目变更状态。已拒绝| |变更状态==项目变更状态。已批准)和&isUserTVAPMgr)
{
附加(
ajax.ActionLink(
“重置为等待批准”,
“重置”,
新{
itemChangeID=change.itemChangeID
},
新的AjaxOptions{
HttpMethod=“POST”,
确认=“将此更改重置为等待批准