Second value in dropdown list

Curious Cat 21

<select class="form-select" asp-for="SpareParts.Item" asp-items="@(new SelectList(Model.Stocks,"ItemCode","ItemName"))">  
<option value="">select...</option>  
</select>

As you can see above, there is ItemCode and ItemName between the bracelets in the SelectList. "ItemCode" as value and "ItemName" as display name.
My point is, how can I add there a second value next to "ItemCode" ?
I did try it with comma to seperate it but EF didn't allow me that.

With other words;
I need also the "ItemName" as value with the "Itemcode" together. I will split them at code-behind side.
Thank you in advance.

AgaveJoe 26,191 Reputation points

2022-11-01T11:44:56.84+00:00
The SelectList constructor overloads do not have this unusual feature. You'll need to write this logic yourself. For example in your stocks class add a read only property that concatenates the ItemCode and the ItemName. Then use the ItemCodeName in the SelectList constructor.

public class Stock { public int ItemCode { get; set; } public string ItemName { get; set; } public string ItemCodeName { get { return $"{ItemCode};{ItemName}"; } } }

If Stock is an entity then add the [NotMapped] to ItemCodeName.
Curious Cat 21 Reputation points

2022-11-01T12:15:06.553+00:00

Hmm... i did try it, thank you.
Well I guess this wont help me.
But at least i learned there is no such feature. Because in old classic asp you could add more than 1 value and could split them when you catch them after post action.
Anyway thank you.
AgaveJoe 26,191 Reputation points

2022-11-01T13:16:29.11+00:00

But at least i learned there is no such feature. Because in old classic asp you could add more than 1 value and could split them when you catch them after post action.

There is nothing stopping you from building a select where the option contains a delimited string. Just like classic asp it is up to you to write the code to render the select. I'm not sure why my example does not work. Perhaps I do not understand the requirement.

Are you trying to create a delimited list of unique values? Can you provide example that illustrates the expected HTML?
Zhi Lv - MSFT 32,011 Reputation points Microsoft Vendor

2022-11-02T06:49:45.207+00:00

Hi @Curious Cat ,

Agree with AgaveJoe, no matter in the classic asp or asp.net core, we should merge the values and add the delimited string by ourselves, and AgaveJoe's code is correct, you can check the following screenshot: [Note] when bind the DropDownList using SelectList, we need to use the ItemCodeName, instead of ItemCode.

Besides, if you don't want to modify the Stock Model, you can create a Stock View Model, then, when query Stock from the database, in the LINQ Select statement, you can convert the result to the Stock View Model and merge the ItemCode and ItemName. code like this:

If I misunderstand your problem or is there any unclear, please let me know freely.

Best regards,
Dillion