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namespace System.Web.Mvc.Html {
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Web.Mvc.Resources;
using System.Web.Routing;
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.PARENT_ACTION_VIEWCONTEXT] = 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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