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If you have your SelectList object, just iterate through the items in it and set the “Selected” property of the item you wish. Why are you trying to set the value after you create the list? My guess is you are creating the list in your model instead of in your view.
HTML option selected Attribute
I recommend creating the underlying enumerable in your model and then using this to build the actual SelectList:. That way your selected value is always set just as the view is rendered and not before. Also, you don’t have to put any unnecessary UI classes i. SelectList in your model and it can remain unaware of the UI.
Further to Womp answer, it’s worth noting that the “Where” Can be dropped, and the predicate can be put into the “First” call directly, like this:. I needed a dropdown in a editable grid myself with preselected dropdown values. Afaik, the selectlist data is provided by the controller to the view, so it is created before the view consumes it.
So, a fairly light solution imo. Guess it fits in the ASP. Net MVC spirit at the time of writing; when not happy roll your own Doug answered my question But I’ll explain what my problem was exactly, and how Doug helped me solve my problem which you could be encountering. When doing so, for some reason when stepping into my model my selected value affiliated property was never set, only until I stepped into the view it came into scope.
I decided not to use DropDownListFor as it has problem when using unobtrusive validation, which is why i reference the following if your curious in a class classed. This will auto-select the first item in your list.
You can modify the above query by adding a where clause. I wanted the dropdown to select the matching value of the id in the action method.
See my DDL sepection asp. I found a fix for this issue that is reported [here]. Ran into the same question. End of day I just did a Razor IF and if disabled had a line with that disabled coded else the same line copied but without disabled coded in. Its not concise – buts its easy to read and follow for other devs. The SelectedValue property of SelectList is readonly simply because there is no guarantee of uniqueness Value does not exist. The Selected property is readonly.
This solution doesn’t make any sense. The where can be replaced with a single call to First: A bit late to the party here but here’s how simple this is: GetCountries”id”, “countryName”, “82” ; this uses my method getcountries to populate a model called countries, obviousley you would replace this with whatever your datasource is, a model etc, then sets the id as the value in the selectlist.
Alex Stephens 1, 1 18 The original post says “how can I set the value after sekection was instantiated”. This doesn’t answer the question.
Simply use the third parameter for selected value hajj2009 mvc4 Html. Heemanshu Bhalla 2, 1 12 I recommend creating the underlying enumerable in your model and then using this to build the actual SelectList: SomeValue, new SelectList Model. Doug Lampe 1, 11 7.
Have you had this working for real? When I use this approach it generates the html for the drop down fine but not the html to set the selected value based on the last argument to the Eelection constructor.
This approach does not work for me either. When using the strongly typed For version of Html. DropDownListthe “current selected value” in the SelectList constructor is ignored. Well done on getting 6 votes for an incorrect answer though: Further to Womp answer, it’s worth noting that the “Where” Can be dropped, and the predicate can be put into the “First” call directly, like this: Immortal Blue 1, 10 To the downvoter – could you care to explain why feel this is a bad answer?!
Erik Lenaerts 31 2.
The Selection Series
So, What I had before Html. I decided selrction to use DropDownListFor as it has problem when using unobtrusive validation, which is why i reference the following if your curious in a class classed HtmlExtensions.
Value ; return SelectExtensions. Barney 1, 2 17 Adam 1 11 You can use below method, which is quite simple. FirstOrDefault ; This will auto-select the first item in your list. Tom Toms 3, 5 25 The OP is asking how to set the selection after the list is instantiated. GetActivity id ; historyVM. Adrian Hedley 1 10 Sign up or log in Sign up using Google. Sign up naj2009 Facebook.