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using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Web.Mvc.Properties;
using System.Web.Routing;
namespace System.Web.Mvc.Html
{
public static class ChildActionExtensions
{
// Action
public static MvcHtmlString Action(this HtmlHelper htmlHelper, string actionName)
{
return Action(htmlHelper, actionName, null /* controllerName */, null /* routeValues */);
}
public static MvcHtmlString Action(this HtmlHelper htmlHelper, string actionName, object routeValues)
{
return Action(htmlHelper, actionName, null /* controllerName */, new RouteValueDictionary(routeValues));
}
public static MvcHtmlString Action(this HtmlHelper htmlHelper, string actionName, RouteValueDictionary routeValues)
{
return Action(htmlHelper, actionName, null /* controllerName */, routeValues);
}
public static MvcHtmlString Action(this HtmlHelper htmlHelper, string actionName, string controllerName)
{
return Action(htmlHelper, actionName, controllerName, null /* routeValues */);
}
public static MvcHtmlString Action(this HtmlHelper htmlHelper, string actionName, string controllerName, object routeValues)
{
return Action(htmlHelper, actionName, controllerName, new RouteValueDictionary(routeValues));
}
public static MvcHtmlString Action(this HtmlHelper htmlHelper, string actionName, string controllerName, RouteValueDictionary routeValues)
{
using (StringWriter writer = new StringWriter(CultureInfo.CurrentCulture))
{
ActionHelper(htmlHelper, actionName, controllerName, routeValues, writer);
return MvcHtmlString.Create(writer.ToString());
}
}
// RenderAction
public static void RenderAction(this HtmlHelper htmlHelper, string actionName)
{
RenderAction(htmlHelper, actionName, null /* controllerName */, null /* routeValues */);
}
public static void RenderAction(this HtmlHelper htmlHelper, string actionName, object routeValues)
{
RenderAction(htmlHelper, actionName, null /* controllerName */, new RouteValueDictionary(routeValues));
}
public static void RenderAction(this HtmlHelper htmlHelper, string actionName, RouteValueDictionary routeValues)
{
RenderAction(htmlHelper, actionName, null /* controllerName */, routeValues);
}
public static void RenderAction(this HtmlHelper htmlHelper, string actionName, string controllerName)
{
RenderAction(htmlHelper, actionName, controllerName, null /* routeValues */);
}
public static void RenderAction(this HtmlHelper htmlHelper, string actionName, string controllerName, object routeValues)
{
RenderAction(htmlHelper, actionName, controllerName, new RouteValueDictionary(routeValues));
}
public static void RenderAction(this HtmlHelper htmlHelper, string actionName, string controllerName, RouteValueDictionary routeValues)
{
ActionHelper(htmlHelper, actionName, controllerName, routeValues, htmlHelper.ViewContext.Writer);
}
// Helpers
internal static void ActionHelper(HtmlHelper htmlHelper, string actionName, string controllerName, RouteValueDictionary routeValues, TextWriter textWriter)
{
if (htmlHelper == null)
{
throw new ArgumentNullException("htmlHelper");
}
if (String.IsNullOrEmpty(actionName))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "actionName");
}
RouteValueDictionary additionalRouteValues = routeValues;
routeValues = MergeDictionaries(routeValues, htmlHelper.ViewContext.RouteData.Values);
routeValues["action"] = actionName;
if (!String.IsNullOrEmpty(controllerName))
{
routeValues["controller"] = controllerName;
}
bool usingAreas;
VirtualPathData vpd = htmlHelper.RouteCollection.GetVirtualPathForArea(htmlHelper.ViewContext.RequestContext, null /* name */, routeValues, out usingAreas);
if (vpd == null)
{
throw new InvalidOperationException(MvcResources.Common_NoRouteMatched);
}
if (usingAreas)
{
routeValues.Remove("area");
if (additionalRouteValues != null)
{
additionalRouteValues.Remove("area");
}
}
if (additionalRouteValues != null)
{
routeValues[ChildActionValueProvider.ChildActionValuesKey] = new DictionaryValueProvider<object>(additionalRouteValues, CultureInfo.InvariantCulture);
}
RouteData routeData = CreateRouteData(vpd.Route, routeValues, vpd.DataTokens, htmlHelper.ViewContext);
HttpContextBase httpContext = htmlHelper.ViewContext.HttpContext;
RequestContext requestContext = new RequestContext(httpContext, routeData);
ChildActionMvcHandler handler = new ChildActionMvcHandler(requestContext);
httpContext.Server.Execute(HttpHandlerUtil.WrapForServerExecute(handler), textWriter, true /* preserveForm */);
}
private static RouteData CreateRouteData(RouteBase route, RouteValueDictionary routeValues, RouteValueDictionary dataTokens, ViewContext parentViewContext)
{
RouteData routeData = new RouteData();
foreach (KeyValuePair<string, object> kvp in routeValues)
{
routeData.Values.Add(kvp.Key, kvp.Value);
}
foreach (KeyValuePair<string, object> kvp in dataTokens)
{
routeData.DataTokens.Add(kvp.Key, kvp.Value);
}
routeData.Route = route;
routeData.DataTokens[ControllerContext.ParentActionViewContextToken] = parentViewContext;
return routeData;
}
private static RouteValueDictionary MergeDictionaries(params RouteValueDictionary[] dictionaries)
{
// Merge existing route values with the user provided values
var result = new RouteValueDictionary();
foreach (RouteValueDictionary dictionary in dictionaries.Where(d => d != null))
{
foreach (KeyValuePair<string, object> kvp in dictionary)
{
if (!result.ContainsKey(kvp.Key))
{
result.Add(kvp.Key, kvp.Value);
}
}
}
return result;
}
internal class ChildActionMvcHandler : MvcHandler
{
public ChildActionMvcHandler(RequestContext context)
: base(context)
{
}
protected internal override void AddVersionHeader(HttpContextBase httpContext)
{
// No version header for child actions
}
}
}
}
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