SelectList selected default value

问题

I have this in my Controller:

ViewBag.ClientID = new SelectList(db.Clients, "ID", "Name");

This in my View (using razor)

@Html.DropDownList("ClientID", null, htmlAttributes: new { @class = "form-control",})

When I load my view I have the first client selected by default and I want to have "--Select Client--"

回答1:

you can use this overload of Html.DropDownList() to add option label:

@Html.DropDownList("ClientID", 
                   null,
                   "Select Client", 
                   htmlAttributes: new { @class = "form-control"})

if you want to set SelectedValue from database then set it in SelectList() constructor as @Nadeem Khan posted.

回答2:

You can do it in the following manner.Please look at the below mentioned answer

 ViewBag.ClientID = new SelectList(db.Clients, "ID", "--Select Client--", selectedValue);

Let me know if it helped you. Thanks

回答3:

Try this in your view:-

@Html.DropDownList("ClientID",null,"--Select Client--", htmlAttributes: new { @class = "form-control",})

You need to use this overloaded version of DropDownList.

来源：https://stackoverflow.com/questions/26777478/selectlist-selected-default-value