Razor Html.DropDownListFor automatically set the selected value

Question

I am new to Razor, I pass dropdown list as a viewbag and another values, when drop down list show in web it has selected values but i haven't set the any selected value, I think I use same name in viewbag value and dropdownlist value,it can be happen?

This is the viewbag,here i set the values and drop downlist:

ViewBag.GlobalInstance = globalInstance;
ViewBag.LegislativeCode = legislativeCode.Trim();
ViewBag.Legislatives = new SelectList(legislativeEntities, "LegislativeCode", "LegislativeName");

This is frontend code:

@if (ViewBag.GlobalInstance == true)
{
        <div class="col-xs-5 hcm-form_controller mandatory gap" >
            <label for="LegislativeCode" class="w-100" mi-resourcekey="atr-LegislativeCode" >Legislative Entity</label>
            @Html.DropDownListFor(m => m.LegislativeCode, ViewBag.Legislatives as SelectList, "--- Select ---", new { @class = "calc-w-100" })
        </div>
}

Can you post the actual html code of the select control that is rendered on the page? Also note, that by default the first option item from your select list will be shown as selected (if no other option item has the selected attribute set) — TheMixy

mj1313 mj1313 · Accepted Answer · 2021-05-18T06:00:00

It seems that the page model has a value for LegislativeCode,

m => m.LegislativeCode

so when there is a same LegislativeCode in the ViewBag.Legislatives, this option will be selected.

Razor Html.DropDownListFor automatically set the selected value

1 Answers