在mvc razor的dropdownlist中设置选定的值 [英] set selected value in dropdownlist in mvc razor

问题描述

我想将我选择的状态设置为此状态下拉列表。我没有任何想法设置这个。请使用以下代码帮助一些人。



Model（ClaimModel）：

i wanna set my selected state into this state dropdownlist. i dont have any idea to set this . please help some one with this below code.

Model(ClaimModel ):

public DataSet Bindcarrier()
        {
            //StudentContext db = new StudentContext();
            try
            {
                con.Open();
                DataSet ds = new DataSet();
                if (con.State == ConnectionState.Open)
                {
                    SqlCommand cmd = new SqlCommand("usp_ddlb_ref_carrier_login", con);
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.AddWithValue("@pi_is_active", 1);
                    cmd.Parameters.AddWithValue("@pi_login_id", DBNull.Value);
                    SqlDataAdapter da = new SqlDataAdapter(cmd);

                    da.Fill(ds);
                    return ds;
                }
                else
                {
                    return ds;
                }

            }
            finally
            {
                con.Close();
            }
        }

查看：



@ Html.DropDownList（state，null，new {@class =drplist}）



控制器：

View:

@Html.DropDownList("state", null, new { @class = "drplist" })

Controller:

[HttpGet]
    public ActionResult Create(Boolean Name)
    {                   ClaimModel obj = new ClaimModel();
                        DataSet ds = obj.Bindstate();

                        ViewBag.fname = ds.Tables[0];
                        List<SelectListItem> items = new List<SelectListItem>();
                        foreach (System.Data.DataRow dr in ViewBag.fname.Rows)
                        {
                            items.Add(new SelectListItem { Text = @dr["state_short_name"].ToString(), Value = @dr["state_id"].ToString() });
                        }

                        ViewBag.State = items;

      }

推荐答案

SelectListItem [ ^ ]具有属性选择...设置为正确的项目，它将是选定的...

SelectListItem[^] has property Selected...set it for the right item and it will be the selected one...

items.Add(new SelectListItem { Text = @dr["state_short_name"].ToString(), Value = @dr["state_id"].ToString(), Selected = (@dr["state_id"] == any_index) });

我使用DropdownListFor（）



我使用模型而不是视图包的方法略有不同。模型是Controller调用的单独类。此堆栈溢出中给出了一个示例 c＃ - MVC ViewModel示例 - 堆栈溢出 [ ^ ]





为了在你的模特中工作，你需要2个属性。

I use DropdownListFor()

Which has a slightly different approach I use a model not a view bag. A model is a separate class called by the Controller. An example is given in this stack overflow c# - MVC ViewModel example - Stack Overflow[^]


For this to work in your model you need 2 properties.

public List<SelectListItem> items {get;set;}
public int MyAssignedToValue {get;set;}

然后在你的视图中

then in your view

@Html.DropdownListFor(a=> a.MyAssignedToValue, Model.items)

这篇关于在mvc razor的dropdownlist中设置选定的值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！