I'm working on an asp .net project. I need to globalize it so I followed a tutorial (I'm a junior dev) on developpez.com (This one). I got a problem with the tutorial but after some searchs I resolve it. Currently, I got 2 links :
What I would like to do is to have flags instead of text. So, I want to add a class to the '< a >' element and put a background image. But when I add the class, the link generated by the Html.Helper is becoming strange. Some parameters are added, I don't understand why.
EDIT : I forgot to write that links doesn't change language when I add the class.
URLs before I add class to a link
English
[Français]
URLs after I add class to a link
English
<a class="drapeauFrance" href="/?Count=6&Keys=System.Collections.Generic.Dictionary%602%2BKeyCollection%5BSystem.String%2CSystem.Object%5D&Values=System.Collections.Generic.Dictionary%602%2BValueCollection%5BSystem.String%2CSystem.Object%5D">[Français]</a>
How I include links to my partial view
#using MIFA.Helpers
#Html.LanguageSelectorLink("en", "[English]", "English", null)
#Html.LanguageSelectorLink("fr", "[Français]", "Français", new { #class = "drapeauFrance" })
How the LangageSelectorLink works
public static MvcHtmlString LanguageSelectorLink(this HtmlHelper helper, string cultureName, string selectedText, string unselectedText, object htmlAttributes, string languageRouteName = "lang", bool strictSelected = false)
{
var language = helper.LanguageUrl(cultureName, languageRouteName, strictSelected);
var link = helper.RouteLink(language.IsSelected ? selectedText : unselectedText, "LocalizedDefault", language.RouteValues, htmlAttributes);
return link;
}
How LangageUrl works
public static Language LanguageUrl(this HtmlHelper helper, string cultureName, string languageRouteName = "lang", bool strictSelected = false)
{
cultureName = cultureName.ToLower();
var routeValues = new RouteValueDictionary(helper.ViewContext.RouteData.Values);
var queryString = helper.ViewContext.HttpContext.Request.QueryString;
foreach (string key in queryString)
{
if (queryString[key] != null && !string.IsNullOrWhiteSpace(key))
{
if (routeValues.ContainsKey(key))
{
routeValues[key] = queryString[key];
}
else
{
routeValues.Add(key, queryString[key]);
}
}
}
var actionName = routeValues["action"].ToString();
var controllerName = routeValues["controller"].ToString();
routeValues[languageRouteName] = cultureName;
var urlHelper = new UrlHelper(helper.ViewContext.RequestContext, helper.RouteCollection);
var url = urlHelper.RouteUrl("LocalizedDefault", routeValues);
var current_lang_name = Thread.CurrentThread.CurrentUICulture.Name.ToLower();
var isSelected = strictSelected ? current_lang_name == cultureName : current_lang_name.StartsWith(cultureName);
return new Language()
{
Url = url,
ActionName = actionName,
ControllerName = controllerName,
RouteValues = routeValues,
IsSelected = isSelected
};
}
I'm asking your help to understand why the URL is changed when I add html attributes.
I tried to understand the function 'LanguageUrl' because to my mind the problem is here but my knowledge are too weak to understand it or to understand the htmlAttributes's impact on URL.
If I made some english mistakes, please tell me I will edit my question.
Thank you in advance for your answers.
It's a bit hard to explain but let me try. There is no such override of the Method RouteLink accepting a type RouteValueDictionary as the third and html attributes of type object. Instead, another override of the Method is assumed automatically, where third parameter is of type object:
RouteLink(this HtmlHelper htmlHelper, string linkText, string routeName, Object routeValues, Object htmlAttributes)
Now the effect is that RouteValueDictionary is used like an anonymous object, by reflecting it's Properties. Which is what you don't want.
One possible solution will be to convert the htmlAttributes to parameter, so that a different Method override is used:
RouteLink(this HtmlHelper htmlHelper, string linkText, string routeName, RouteValueDictionary routeValues, IDictionary<string, Object> htmlAttributes)
To get this working, all you have to do is convert the anonymous object to IDictionary<string, Object> which you will do by calling:
HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
Your new LanguageSelectorLinkMethod:
public static MvcHtmlString LanguageSelectorLink(this HtmlHelper helper, string cultureName, string selectedText, string unselectedText, object htmlAttributes, string languageRouteName = "lang", bool strictSelected = false)
{
var language = helper.LanguageUrl(cultureName, languageRouteName, strictSelected);
var attributeDictionary = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
var link = helper.RouteLink(language.IsSelected ? selectedText : unselectedText, "LocalizedDefault", language.RouteValues, attributeDictionary);
return link;
}
voilà!
I think your hitting the wrong overload, try:
var link = helper.RouteLink(language.IsSelected ? selectedText : unselectedText, language.RouteValues, htmlAttributes);
Related
I need my app to send a confirmation email to a user. I have used the following method to render the view as a string:
public string RenderViewToString<T>(string viewPath, T model)
{
using (var writer = new StringWriter())
{
var view = new WebFormView(viewPath);
var vdd = new ViewDataDictionary<T>(model);
var viewCxt = new ViewContext(ControllerContext, view, vdd, new TempDataDictionary(), writer);
viewCxt.View.Render(viewCxt, writer);
return writer.ToString();
}
}
which I got from here. It works great, however my images aren't being included. I'm using:
<img src="<%:Url.Content("~/Resource/confirmation-email/imageName.png") %>"
which is giving me
http://resource/confirmation-email/imageName.png
This works fine when viewing the page on the site, however the image links don't work in the email.
I need it to give me me:
http://domain.com/application/resource/confirmation-email/imageName.png
I've also tried using:
VirtualPathUtility.ToAbsolute()
This is what I used on a site recently:
public static string ResolveServerUrl(string serverUrl, bool forceHttps = false, bool getVirtualPath = true)
{
if (getVirtualPath)
serverUrl = VirtualPathUtility.ToAbsolute(serverUrl);
if (serverUrl.IndexOf("://") > -1)
return serverUrl;
string newUrl = serverUrl;
Uri originalUri = System.Web.HttpContext.Current.Request.Url;
newUrl = (forceHttps ? "https" : originalUri.Scheme) + "://" + originalUri.Authority + newUrl;
return newUrl;
}
I could then use it to generate Absolute urls by doing Core.ResolveServerUrl("~/Resource/confirmation-email/imageName.png"); (assuming you wrap the static function in a class named Core)
HTH
There isn't a way to do this. You can add the following extension method.
using System.Web.Mvc;
public static class UrlHelperExtensions
{
public static string ToAbsoluteUrl(this UrlHelper helper, string relativeUrl) {
if (Request.IsSecureConnection)
return string.Format("https://{0}{1}", Request.Url.Host, Page.ResolveUrl(relativeUrl));
else
return string.Format("http://{0}{1}", Request.Url.Host, Page.ResolveUrl(relativeUrl));
}
}
Which you can then call like so
<img src="<%:Url.ToAbsoluteUrl("~/Resource/confirmation-email/imageName.png") %>" ...
I need to present my user with a list of package options, from which they select one. I don't want to use a radio button list, as I need fairly complex templating for each list item. Forgive me, but I just can't seem to figure out how to link a column of radio buttons to a selection property in my view model.
My view model has a SelectedPackageId (int), and a list of MemberPackageListItem view models that represent the individual packages. MemberPackageListItem has a PackageId (int), so I need to couple the PackageId of the selected item to the SelectedPackageId of the root view model.
It is hard for me to post code, as inheritance etc. obscures much of what you would want to see, so I'm hoping my outline of a fairly common scenario, and some general guidelines on using radio buttons in this scenario will suffice to help me continue.
I would suggest using an HtmlHelper to render your radio button list, as follows:
[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
public static MvcHtmlString RadioButtonListFor<TModel, TList, TSelectedItem>(
this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TList>> expression,
Expression<Func<TModel, TSelectedItem>> selectedItem)
{
return RadioButtonListFor(htmlHelper, expression, selectedItem, null /* htmlAttributes */);
}
[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
public static MvcHtmlString RadioButtonListFor<TModel, TList, TSelectedItem>(
this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TList>> expression,
Expression<Func<TModel, TSelectedItem>> selectedItem, object htmlAttributes)
{
return RadioButtonListFor(htmlHelper, expression, selectedItem, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}
[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
public static MvcHtmlString RadioButtonListFor<TModel, TList, TSelectedItem>(
this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TList>> expression,
Expression<Func<TModel, TSelectedItem>> selectedItem, IDictionary<string, object> htmlAttributes)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
IEnumerable<SelectListItem> items = null;
if (metadata.Model != null)
{
IEnumerable<SelectListItem> modelItems = (IEnumerable<SelectListItem>)metadata.Model;
if (modelItems != null)
{
items = modelItems;
}
}
ModelMetadata selectedItemMetadata = ModelMetadata.FromLambdaExpression(selectedItem, htmlHelper.ViewData);
return RadioButtonListHelper(htmlHelper, metadata, selectedItemMetadata, ExpressionHelper.GetExpressionText(selectedItem), items, htmlAttributes);
}
private static MvcHtmlString RadioButtonListHelper(HtmlHelper htmlHelper, ModelMetadata metadata,
ModelMetadata selectedItemMetadata, string name, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes)
{
// Verify arguments
if (String.IsNullOrEmpty(name)) throw new ArgumentNullException("name", "Name cannot be null");
if (selectList == null) throw new ArgumentNullException("selectList", "Select list cannot be null");
if (selectList.Count() < 1) throw new ArgumentException("Select list must contain at least one value", "selectList");
string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
string fullId = htmlHelper.ViewData.TemplateInfo.HtmlFieldPrefix + "_" + name;
IDictionary<string, object> validationAttributes = htmlHelper
.GetUnobtrusiveValidationAttributes(ExpressionHelper.GetExpressionText(name), selectedItemMetadata);
// Define items
StringBuilder items = new StringBuilder();
// Loop through items
Int32 index = 0;
foreach (SelectListItem i in selectList)
{
// Define check box input
TagBuilder input = new TagBuilder("input");
input.MergeAttribute("type", "radio");
input.MergeAttribute("name", fullName, true);
if (i.Selected)
input.MergeAttribute("checked", "checked");
input.MergeAttribute("value", i.Value);
if (index == 0)
input.MergeAttributes(validationAttributes);
input.MergeAttributes(htmlAttributes);
// Define label
TagBuilder label = new TagBuilder("label");
label.MergeAttribute("for", fullId + "[" + index.ToString() + "].Selected");
label.InnerHtml = i.Text;
// Add item
items.AppendFormat("\r\t<div>\r\t\t{0}\r\t\t{1}\r\t</div>",
input.ToString(TagRenderMode.Normal),
label.ToString(TagRenderMode.Normal));
index++;
}
// Return list
return new MvcHtmlString(items.ToString() + "\r");
}
Please note that MemberPackageListItem must be of type IEnumerable<SelectListItem>. Usage is as follows (Razor syntax):
#Html.RadioButtonListFor(m => m.MemberPackageListItem, m => m.SelectedPackageId)
counsellorben
While I appreciate the technical comprehensiveness of #counsellorben's answer, and will keep it around for future use, today I arrived at a more immediate and not altogether clumsy jQuery solution. The selectors could be more specific, but I have no need now. My solution is below. Radio type inputs are grouped by their name attribute, which is given a different index for each row. Therefore:
$(function () {
// Back up current names of package radio buttons, then make all their names the same for grouping.
$("#packageForm :radio[name$='.IsSelected']").each(function () {
$(this).attr("oldname", $(this).attr("name"));
});
$(":radio[name$='.IsSelected']").attr("name", "Package.IsSelected");
// Hook the 'submit' click to restore original radio button names.
$("#packageForm :submit").click(function () {
$(":radio[name='Package.IsSelected']").each(function () {
$(this).attr("oldname", $(this).attr("name"));
});
});
});
IsSelected is my property per row that tells me if that row is selected, it isn't a jQuery or DOM property.
I am pretty new to ASP.Net MVC (and razor) and I have a few questions.
1)
I created an HTML extension to create a check box list as below:
public static HtmlString CheckBoxList(this HtmlHelper htmlHelper, string name, List<InputItemInfo> ItemInfo)
{
if (String.IsNullOrEmpty(name))
throw new ArgumentException("The argument must have a value", "name");
if (ItemInfo == null)
throw new ArgumentNullException("ItemInfo");
if (ItemInfo.Count < 1)
throw new ArgumentException("The list must contain at least one value", "ItemInfo");
StringBuilder sb = new StringBuilder();
ItemInfo.Insert(0, new InputItemInfo("*", "Select All", ItemInfo.All(i => i.IsChecked)));
foreach (InputItemInfo info in ItemInfo)
{
TagBuilder builder = new TagBuilder("input");
if (info.IsChecked) builder.MergeAttribute("checked", "checked");
builder.MergeAttribute("type", "checkbox");
builder.MergeAttribute("value", info.Value);
builder.MergeAttribute("name", name);
builder.InnerHtml = info.DisplayText;
sb.Append(builder.ToString(TagRenderMode.Normal));
sb.Append("<br />");
}
return new HtmlString(sb.ToString());
}
I was able to use this in my views and also get the values in the controller as shown below:
#model List<AppTest.Models.InputExtensionsViewModel>
#{
ViewBag.Title = "Check";
}
<h2>Check</h2>
#using (Html.BeginForm())
{
<table border="0" style="border:0px;">
<tr>
<td valign="top">
#Html.Partial("CheckBoxList", Model[0])
</td>
</tr>
</table>
<br />
<input type="submit" value="Go" />
}
<div style="font-weight:bolder">
#ViewData["data"]
</div>
controller:
public ActionResult Check()
{
var model = new List<InputExtensionsViewModel>();
var model1 = new InputExtensionsViewModel
{
Title = "Facilities",
InputElementName = "facilities",
InputElements = // a list
};
model.Add(model1);
return View(model);
}
[HttpPost]
public ActionResult Check(string[] facilities)
{
...
}
The model is:
public class InputExtensionsViewModel
{
public string Title { get; set; }
public string InputElementName { get; set; }
public List<InputItemInfo> InputElements { get; set; }
public void SetSelected(string[] items)
{
if (items == null)
return;
this.InputElements.ForEach(delegate(InputItemInfo info)
{
if (items.Contains(info.Value))
info.IsChecked = true;
});
}
}
My question is, is there a way by which I could bind the array items to a property in the InputExtensionsViewModel model? If I just add a property called facilities to the view model, it's not bound automatically and I can understand why, as I am not binding that in my view. But I cannot seem to think of a way by which I could do that.
This check box list is a user control and I just wanted to avoid having too many string[] array for my action methods.
[EDIT] - Okay, I was able to do this when I tried now. Not sure why it didn't work before.
2) And, I was checking for alternatives and found out this answer in SO:
CheckboxList in MVC3.0
And I was able to replicate this but my question is, how do i bind a label to this checkbox? My labels are dynamic and part of the model and so cannot be hard-coded. I was trying to use a Html.LabelFor but that didn't work. In the editor template, if I just #Model.Text, it won't work and will be lost after a post-back as its not bound to a property
I googled and found suggestions to create HTML helpers which is what I did earlier (my 1st question is about that).
Please let me know if something is unclear. I could elaborate. Any input is appreciated!
Thanks in advance!
Ah, I found the solutions!
1) As indicated in my edit - adding a property with a similar name to a model and using it in the [HttpPost] enabled action method works fine. Guess last time I missed the getter and setters.
2) For this, in the editor template for MyViewModel, we just need to add this (** and **, needless to say, remove **!):
#model AppName.Models.MyViewModel
#Html.HiddenFor(x => x.Id)
#Html.CheckBoxFor(x => x.IsChecked) **#Model.Text
#Html.HiddenFor(x => x.Text)**
EDIT:
I have changed this template to do more. Now there is a label control and it is associated to the checkboxes through jquery as shown below.
#model EncorPlusTest.Infrastructure.InputItemInfo
#Html.HiddenFor(model => model.Value)
#Html.CheckBoxFor(model => model.IsChecked) <label for="">#Model.Text</label>
#Html.HiddenFor(model => model.Text)
<br />
Then in jquery:
$('input:checkbox').each(function () {
var lbl = $(this).next('input:hidden').next('label');
var forID = $(this).attr('id');
$(lbl).attr('for', forID);
});
Hope its helpful for others!
To answer part 2, you can easily add your label text as a property such as:
public class MyViewModel
{
public int Id { get; set; }
public bool IsChecked { get; set; }
public string Text { get; set; }
}
Then your template would look similar to this:
#model AppName.Models.MyViewModel
#Html.HiddenFor(x => x.Id)
#Html.CheckBoxFor(x => x.IsChecked)
#Html.LabelFor(x => x.Text)
The only downside to the above is that the label wouldn't be linked directly to the checkbox. You can accomplish this by doing something such as: CheckboxList in MVC3
Depending on the chance for re-usability, you can always create your own HtmlHelper as you were doing in the first part of this and wrap in the suggestions from the URL I pasted above.
You don't jQuery to solve this problem. If you wrap the input with a label you get the same behavior.
By the way, another option, instead of a editor template, is a HTML Helper. Take a look at this:
public static class HtmlHelperExtensions
{
#region CheckBoxList
public static MvcHtmlString CheckBoxList(this HtmlHelper htmlHelper, string name, List<SelectListItem> listInfo)
{
return htmlHelper.CheckBoxList(name, listInfo, ((IDictionary<string, object>)null));
}
public static MvcHtmlString CheckBoxList(this HtmlHelper htmlHelper, string name, List<SelectListItem> listInfo, object htmlAttributes)
{
return htmlHelper.CheckBoxList(name, listInfo, ((IDictionary<string, object>)new RouteValueDictionary(htmlAttributes)));
}
public static MvcHtmlString CheckBoxList(this HtmlHelper htmlHelper, string name, List<SelectListItem> selectListItems, IDictionary<string, object> htmlAttributes)
{
// Verify arguments
if (String.IsNullOrEmpty(name))
throw new ArgumentNullException("name", "Name cannot be null");
if (selectListItems == null)
throw new ArgumentNullException("selectList", "Select list cannot be null");
if (selectListItems.Count() < 1)
throw new ArgumentException("Select list must contain at least one value", "selectList");
// Define items
StringBuilder items = new StringBuilder();
int index = 0;
// Loop through items)
foreach (SelectListItem i in selectListItems)
{
// hidden value
TagBuilder hiddenValue = new TagBuilder("input");
hiddenValue.MergeAttribute("type", "hidden");
hiddenValue.MergeAttribute("value", i.Value);
hiddenValue.MergeAttribute("id", string.Format("{0}_{1}__Value", name, index));
hiddenValue.MergeAttribute("name", string.Format("{0}[{1}].Value", name, index));
// check box
TagBuilder checkbox = new TagBuilder("input");
if (i.Selected)
checkbox.MergeAttribute("checked", "checked");
checkbox.MergeAttribute("id", string.Format("{0}_{1}__Selected", name, index));
checkbox.MergeAttribute("name", string.Format("{0}[{1}].Selected", name, index));
checkbox.MergeAttribute("type", "checkbox");
checkbox.MergeAttribute("value", "true");
// wrapper label
TagBuilder wrapperLabel = new TagBuilder("label");
wrapperLabel.InnerHtml = checkbox.ToString(TagRenderMode.SelfClosing);
wrapperLabel.InnerHtml += i.Text;
// hidden selected
TagBuilder hiddenSelected = new TagBuilder("input");
hiddenSelected.MergeAttribute("type", "hidden");
hiddenSelected.MergeAttribute("value", i.Selected.ToString().ToLower());
hiddenSelected.MergeAttribute("name", string.Format("{0}[{1}].Selected", name, index));
// label for checkbox
TagBuilder checkBoxLabel = new TagBuilder("label");
checkBoxLabel.MergeAttribute("for", checkbox.Attributes["id"]);
checkBoxLabel.MergeAttribute("id", string.Format("{0}_{1}__Text", name, index));
checkBoxLabel.MergeAttribute("name", string.Format("{0}[{1}].Text", name, index));
// hidden text
TagBuilder hiddenText = new TagBuilder("input");
hiddenText.MergeAttribute("type", "hidden");
hiddenText.MergeAttribute("value", i.Text);
hiddenText.MergeAttribute("id", string.Format("{0}_{1}__Text", name, index));
hiddenText.MergeAttribute("name", string.Format("{0}[{1}].Text", name, index));
// Add item
items.AppendLine(hiddenValue.ToString(TagRenderMode.SelfClosing));
items.AppendLine(wrapperLabel.ToString(TagRenderMode.Normal));
items.Append(hiddenSelected.ToString(TagRenderMode.SelfClosing));
items.AppendLine(hiddenText.ToString(TagRenderMode.SelfClosing));
items.AppendLine();
index++;
}
return MvcHtmlString.Create(items.ToString());
}
public static MvcHtmlString CheckBoxListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
{
var name = ExpressionHelper.GetExpressionText(expression);
var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
return CheckBoxList(htmlHelper, name, metadata.Model as List<SelectListItem>);
}
#endregion
}
I'm writing a method which, let's say, given 1 and hello should return http://something.com/?something=1&hello=en.
I could hack this together pretty easily, but what abstraction functionality does ASP.NET 3.5 provide for building URIs? I'd like something like:
URI uri = new URI("~/Hello.aspx"); // E.g. ResolveUrl is used here
uri.QueryString.Set("something", "1");
uri.QueryString.Set("hello", "en");
return uri.ToString(); // /Hello.aspx?something=1&hello=en
I found the Uri class which sounds highly relevant, but I can't find anything which does the above really. Any ideas?
(For what it's worth, the order of the parameters doesn't matter to me.)
Edited to correct massively incorrect code
Based on this answer to a similar question you could easily do something like:
UriBuilder ub = new UriBuilder();
// You might want to take more care here, and set the host, scheme and port too
ub.Path = ResolveUrl("~/hello.aspx"); // Assumes we're on a page or control.
// Using var gets around internal nature of HttpValueCollection
var coll = HttpUtility.ParseQueryString(string.Empty);
coll["something"] = "1";
coll["hello"] = "en";
ub.Query = coll.ToString();
return ub.ToString();
// This returned the following on the VS development server:
// http://localhost/Hello.aspx?something=1&hello=en
This will also urlencode the collection, so:
coll["Something"] = "1";
coll["hello"] = "en&that";
Will output:
Something=1&hello=en%26that
As far I know nothing here. So everybody has its own implementation.
Example from LinqToTwitter.
internal static string BuildQueryString(IEnumerable<KeyValuePair<string, string>> parameters)
{
if (parameters == null)
{
throw new ArgumentNullException("parameters");
}
StringBuilder builder = new StringBuilder();
foreach (var pair in parameters.Where(p => !string.IsNullOrEmpty(p.Value)))
{
if (builder.Length > 0)
{
builder.Append("&");
}
builder.Append(Uri.EscapeDataString(pair.Key));
builder.Append("=");
builder.Append(Uri.EscapeDataString(pair.Value));
}
return builder.ToString();
}
UPDATE:
You can also create extension method:
public static UriBuilder AddArgument(this UriBuilder builder, string key, string value)
{
#region Contract
Contract.Requires(builder != null);
Contract.Requires(key != null);
Contract.Requires(value != null);
#endregion
var query = builder.Query;
if (query.Length > 0)
{
query = query.Substring(1) + "&";
}
query += Uri.EscapeDataString(key) + "="
+ Uri.EscapeDataString(value);
builder.Query = query;
return builder;
}
And usage:
var b = new UriBuilder();
b.AddArgument("test", "test");
Please note that everything here is untested.
Just combined answers=>
public static class UriBuilderExtensions
{
public static void AddQueryArgument(this UriBuilder b, string key, string value)
{
key = Uri.EscapeDataString(key);
value = Uri.EscapeDataString(value);
var x = HttpUtility.ParseQueryString(b.Query);
if (x.AllKeys.Contains(key)) throw new ArgumentNullException
("Key '{0}' already exists!".FormatWith(key));
x.Add(key, value);
b.Query = x.ToString();
}
public static void EditQueryArgument(this UriBuilder b, string key, string value)
{
key = Uri.EscapeDataString(key);
value = Uri.EscapeDataString(value);
var x = HttpUtility.ParseQueryString(b.Query);
if (x.AllKeys.Contains(key))
x[key] = value;
else throw new ArgumentNullException
("Key '{0}' does not exists!".FormatWith(key));
b.Query = x.ToString();
}
public static void AddOrEditQueryArgument(this UriBuilder b, string key, string value)
{
key = Uri.EscapeDataString(key);
value = Uri.EscapeDataString(value);
var x = HttpUtility.ParseQueryString(b.Query);
if (x.AllKeys.Contains(key))
x[key] = value;
else
x.Add(key, value);
b.Query = x.ToString();
}
public static void DeleteQueryArgument(this UriBuilder b, string key)
{
key = Uri.EscapeDataString(key);
var x = HttpUtility.ParseQueryString(b.Query);
if (x.AllKeys.Contains(key))
x.Remove(key);
b.Query = x.ToString();
}
}
Half baked code. But should work well enough.
There's also the UriBuilder class
This is something that might appeal to you- recently at work I was looking at a way to "type" commonly used URL query string variables and so developed this interface:
'Represent a named parameter that is passed from page-to-page via a range of methods- query strings, HTTP contexts, cookies, session, etc.
Public Interface INamedParam
'A key that uniquely identfies this parameter in any HTTP value collection (query string, context, session, etc.)
ReadOnly Property Key() As String
'The default value of the paramter.
ReadOnly Property DefaultValue() As Object
End Interface
You can then implement this interface to describe a query string parameter, such an implementation for your "Hello" param might look like this:
Public Class HelloParam
Implements INamedParam
Public ReadOnly Property DefaultValue() As Object Implements INamedParam.DefaultValue
Get
Return "0"
End Get
End Property
Public ReadOnly Property Key() As String Implements INamedParam.Key
Get
Return "hello"
End Get
End Property
End Class
I developed a small (and very, very basic) class to help build URLs using these strongly typed parameters:
Public Class ParametrizedHttpUrlBuilder
Private _RelativePath As String
Private _QueryString As String
Sub New(ByVal relativePath As String)
_RelativePath = relativePath
_QueryString = ""
End Sub
Public Sub AddQueryParameterValue(ByVal param As INamedParam, ByVal value As Object)
Dim sb As New Text.StringBuilder(30)
If _QueryString.Length > 0 Then
sb.Append("&")
End If
sb.AppendFormat("{0}={1}", param.Key, value.ToString())
_QueryString &= sb.ToString()
End Sub
Public Property RelativePath() As String
Get
Return _RelativePath
End Get
Set(ByVal value As String)
If value Is Nothing Then
_RelativePath = ""
End If
_RelativePath = value
End Set
End Property
Public ReadOnly Property Query() As String
Get
Return _QueryString
End Get
End Property
Public ReadOnly Property PathAndQuery() As String
Get
Return _RelativePath & "?" & _QueryString
End Get
End Property
End Class
Here's my version (needs .NET4 or a ToArray() call on the Select)
var items = new Dictionary<string,string> { { "Name", "Will" }, { "Age", "99" }};
String query = String.Join("&", items.Select(i => String.Concat(i.Key, "=", i.Value)));
I thought the use of Dictionary might mean the items can get reordered, but that doesn't actually seem to be happening in experiments here - not sure what that's about.
I have a function with a List return type. I'm using this in a JSON-enabled WebService like:
[WebMethod(EnableSession = true)]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public List<Product> GetProducts(string dummy) /* without a parameter, it will not go through */
{
return new x.GetProducts();
}
this returns:
{"d":[{"__type":"Product","Id":"2316","Name":"Big Something ","Price":"3000","Quantity":"5"}]}
I need to use this code in a simple aspx file too, so I created a JavaScriptSerializer:
JavaScriptSerializer js = new JavaScriptSerializer();
StringBuilder sb = new StringBuilder();
List<Product> products = base.GetProducts();
js.RegisterConverters(new JavaScriptConverter[] { new ProductConverter() });
js.Serialize(products, sb);
string _jsonShopbasket = sb.ToString();
but it returns without a type:
[{"Id":"2316","Name":"Big One ","Price":"3000","Quantity":"5"}]
Does anyone have any clue how to get the second Serialization work like the first?
Thanks!
When you create the JavaScriptSerializer, pass it an instance of SimpleTypeResolver.
new JavaScriptSerializer(new SimpleTypeResolver())
No need to create your own JavaScriptConverter.
Ok, I have the solution, I've manually added the __type to the collection in the JavaScriptConverter class.
public class ProductConverter : JavaScriptConverter
{ public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
{
Product p = obj as Product;
if (p == null)
{
throw new InvalidOperationException("object must be of the Product type");
}
IDictionary<string, object> json = new Dictionary<string, object>();
json.Add("__type", "Product");
json.Add("Id", p.Id);
json.Add("Name", p.Name);
json.Add("Price", p.Price);
return json;
}
}
Is there any "offical" way to do this?:)
Building on Joshua's answer, you need to implement a SimpleTypeResolver
Here is the "official" way that worked for me.
1) Create this class
using System;
using System.Web;
using System.Web.Compilation;
using System.Web.Script.Serialization;
namespace XYZ.Util
{
/// <summary>
/// as __type is missing ,we need to add this
/// </summary>
public class ManualResolver : SimpleTypeResolver
{
public ManualResolver() { }
public override Type ResolveType(string id)
{
return System.Web.Compilation.BuildManager.GetType(id, false);
}
}
}
2) Use it to serialize
var s = new System.Web.Script.Serialization.JavaScriptSerializer(new XYZ.Util.ManualResolver());
string resultJs = s.Serialize(result);
lblJs.Text = string.Format("<script>var resultObj = {0};</script>", resultJs);
3) Use it to deserialize
System.Web.Script.Serialization.JavaScriptSerializer(new XYZ.Util.ManualResolver());
var result = json.Deserialize<ShoppingCartItem[]>(jsonItemArray);
Full post here: http://www.agilechai.com/content/serialize-and-deserialize-to-json-from-asp-net/