asp.net-mvc-3

MVC3 Valums Ajax File Upload

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I figured it out. this works in IE and Mozilla. [HttpPost] public ActionResult FileUpload(string qqfile) { var path = @”C:\\Temp\\100\\”; var file = string.Empty; try { var stream = Request.InputStream; if (String.IsNullOrEmpty(Request[“qqfile”])) { // IE HttpPostedFileBase postedFile = Request.Files[0]; stream = postedFile.InputStream; file = Path.Combine(path, System.IO.Path.GetFileName(Request.Files[0].FileName)); } else { //Webkit, Mozilla file = Path.Combine(path, qqfile); … Read more

How can I use Html.Action?

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You should look at the documentation for the Action method; it’s explained well. For your case, this should work: @Html.Action(“GetOptions”, new { pk=”00″, rk=”00″ }); The controllerName parameter will default to the controller from which Html.Action is being invoked. So if you’re trying to invoke an action from another controller, you’ll have to specify the … Read more

Unable to find the requested .Net Framework Data Provider. It may not be installed. – when following mvc3 asp.net tutorial

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I was able to solve a problem similar to this in Visual Studio 2010 by using NuGet. Go to Tools > Library Package Manager > Manage NuGet Packages For Solution… In the dialog, search for “EntityFramework.SqlServerCompact”. You’ll find a package with the description “Allows SQL Server Compact 4.0 to be used with Entity Framework.” Install … Read more

ASP.net MVC – Display Template for a collection

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Like this: @Html.DisplayFor(m => m.Children, “YourTemplateName”) or like this: [UIHint(“YourTemplateName”)] public IEnumerable<ChildModel> Children { get; set; } where obviously you would have ~/Views/Shared/DisplayTemplates/YourTemplateName.cshtml: @model IEnumerable<ChildModel> <table> <tr> <th>Property 1</th> <th>Property 2</th> </tr> … </table>

An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key

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As mentioned by @anon you can’t attach model once you loaded the entity with the same key. The changes must be applied to attached entity. Instead of this: db.Entry(model).State = EntityState.Modified; use this: db.Entry(v).CurrentValues.SetValues(model);

Better way to get active page link in MVC 3 Razor

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A better approach is to use a HTML helper: using System.Web.Mvc; using System.Web.Mvc.Html; public static class MenuExtensions { public static MvcHtmlString MenuItem( this HtmlHelper htmlHelper, string text, string action, string controller ) { var li = new TagBuilder(“li”); var routeData = htmlHelper.ViewContext.RouteData; var currentAction = routeData.GetRequiredString(“action”); var currentController = routeData.GetRequiredString(“controller”); if (string.Equals(currentAction, action, StringComparison.OrdinalIgnoreCase) && … Read more

Call MVC 3 Client Side Validation Manually for ajax posts

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Try: //using the form as the jQuery selector (recommended) $(‘form’).submit(function(evt) { evt.preventDefault(); var $form = $(this); if($form.valid()) { //Ajax call here } }); //using the click event on the submit button $(‘#buttonId’).click(function(evt) { evt.preventDefault(); var $form = $(‘form’); if($form.valid()) { //Ajax call here } }); This should work with jQuery ajax and MSAjax calls. Could … Read more

Why doesn’t Visual Studio code formatting work properly for Razor markup?

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Be sure to set the editor to use space characters and not tabs. The editor seems to completely lose its mind when tabs are used. This is a shame because all those space characters end up in the actual HTML output, greatly increasing the data transfer size. What I do is manually supplement the automatic … Read more

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