插入空白行

Question

我有以下代码绑定到@ Html.DropDownListFor：

视图模型

    public static UserManagementViewModel CreateCompanyMappingViewModel(List<Company> company)
    {
        UserManagementViewModel viewModel = new UserManagementViewModel();
        viewModel.Companies = new SelectList(company, "CompanyID", "CompanyName");
        return viewModel;
    }
}

CSHTML

@Html.DropDownListFor(model => model.CompanyID, Model.Companies, new { style = "width:300px;" })

下拉列表已成功绑定。我需要的是，在DropDownList中插入一个空白行并在绑定到DropDownList时首先选择它。怎么样？

Answer 1

您可以使用following overload：

@Html.DropDownListFor(
    model => model.CompanyID, 
    Model.Companies, 
    "-- select a company --", 
    new { style = "width:300px;" }
)

Answer 2

@ Html.DropDownListFor（model =＆gt; model.CompanyID，Model.Companies，“”，new {style =“width：300px;”}）