如何将信息作为参数从视图传递到控制器

Question

I have a form and two SQL databases. The Form is to submit information to Database 1, but when the user enters information into the first field I need it to scan Database 2 for this data and populate a Description from this.

I currently have a button that will run script in the controller to retrieve this data. However, I don't know how to pass the first field as a parameter to the button onclick so it will use this to search the database.

Everything works in the controller but I don't know how to take information that is typed in an EditorFor text field and submit this to the button as a parameter. I have tried using the 'Model' to do this but my understanding of how this works is limited.

My View:

<div class="form-group">
        @Html.LabelFor(model => model.Number, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-4">
            @Html.EditorFor(model => model.Number, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Number, "", new { @class = "text-danger" })
        </div>
        <div class="col-md-1">
            <input type="button" value="Search" class="btn btn-default" onclick="location.href='@Url.Action("Search", "Catalog", new { Number = Model.Number })'" ; />
        </div>
    </div>

My Controller:

 public ActionResult Search(string catNo = "10004361")
        {
            IFS_Catalog_Products DatabaseScanner = new IFS_Catalog_Products();
            string catDesc = "";

            if (ModelState.IsValid)
            {
                SqlConnection con = new SqlConnection();
                con.ConnectionString = @"CONNECTION STRING";
                con.Open();

                SqlCommand cmd = new SqlCommand("SELECT DESCRIPTION FROM TABLE WHERE NUMBER = '" + catNo + "'", con);
                SqlDataReader dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    catDesc = dr.GetString(0);
                    //break;
                }
                    con.Close();
            }
            DatabaseScanner.IFS_Catalog_Desc = catDesc;
            DatabaseScanner.IFS_Catalog_No = catNo;

            return View("Create", DatabaseScanner);
        }

The code compiles correctly and all aspects of the code work except for the Model.Number only ever passes a Null into the script.

I want to take the information from model.Number within the EditorFor field and use this within the statement.

Answer 1

您需要使用@Html.ActionLink帮助器而不是button来实现目标，如下所示：

@Html.ActionLink("Search", "Search", "Catalog", new { catNo = Model.Number }, new { @class="btn btn-default" })

Answer 2

I would use the POST action like this:

1. your view:

    @model YOUR_MODEL @using (Html.BeginForm("Search", "Home", FormMethod.Post)) { <div class="form-group"> @Html.LabelFor(model => model.Number, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-4"> @Html.EditorFor(model => model.Number, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.Number, "", new { @class = "text-danger" }) </div> <div class="col-md-1"> <input type="button" value="Search" class="btn btn-default"/> </div> 

   }

2. your model:

    public class YOUR_MODEL { public string Number {get;set;} } 

3. your controller

    [HttpPost] public ActionResult Search(YOUR_MODEL model) { IFS_Catalog_Products DatabaseScanner = new IFS_Catalog_Products(); string catDesc = ""; if (ModelState.IsValid) { SqlConnection con = new SqlConnection(); con.ConnectionString = @"CONNECTION STRING"; con.Open(); SqlCommand cmd = new SqlCommand("SELECT DESCRIPTION FROM TABLE WHERE NUMBER = '" + model.Number+ "'", con); SqlDataReader dr = cmd.ExecuteReader(); while (dr.Read()) { catDesc = dr.GetString(0); //break; } con.Close(); } DatabaseScanner.IFS_Catalog_Desc = catDesc; DatabaseScanner.IFS_Catalog_No = catNo; return View("Create", DatabaseScanner); }