Question

我有一个名为HOLIDAY_DATE_TABLE的表。当用户通过我的应用程序在表中创建新记录时，ACTION_TYPE字段被赋值为“ADD”。当用户更新行时，如果当前ACTION_TYPE值不等于“ADD”，我希望ACTION_TYPE字段包含值“CHANGE”。我试图解决的问题是，当你在我的应用程序中创建一个新行时，它应该始终具有ACTION_TYPE值“ADD”。但是，当我更新通过我的应用程序创建的那一行时，它会更改为“CHANGE”。我已尝试使用下面的代码修复此问题，但在这种情况下，值仍会更新为“CHANGE”。

控制器

  public ActionResult Edit(int id = 0)
    {
        HOLIDAY_DATE_TABLE holiday_date_table = db.HOLIDAY_DATE_TABLE.Find(id);
        if (holiday_date_table == null)
        {
            return HttpNotFound();
        }
        return View(holiday_date_table);
    }

    //
    // POST: /Table8/Edit/5

    [HttpPost]
    public ActionResult Edit(HOLIDAY_DATE_TABLE holiday_date_table)
    {
        if (ModelState.IsValid)
        {

            var somevar = holiday_date_table.HID.ToString();
            string aconnectionString1 = "Data Source=SWDB10DSQL;Initial Catalog=BillingUI;Integrated Security=True;MultipleActiveResultSets=True;Application Name=EntityFramework";
            string checkgroup1 = "SELECT ACTION_TYPE FROM HOLIDAY_DATE_TABLE WHERE HID = @ACTION";
            using (SqlConnection _mycon = new SqlConnection(aconnectionString1))
            {
                    using (SqlCommand mycmd = new SqlCommand(checkgroup1, _mycon))
                    {
                        _mycon.Open();
                        mycmd.Parameters.Add("@ACTION", SqlDbType.NChar).Value = somevar;
                        string checkresult = (string)mycmd.ExecuteScalar();
                        //cmd31.Parameters.Add("@SECURITY_GROUP", SqlDbType.VarChar).Value = "";
                        //string checkresult = (string)mycmd.ExecuteScalar();

                        if (checkresult == "ADD")
                        {
                            db.Entry(holiday_date_table).State = EntityState.Modified;
                            db.SaveChanges();
                        }
                        else
                        {

                            holiday_date_table.ACTION_TYPE = "CHANGE";
                            db.Entry(holiday_date_table).State = EntityState.Modified;
                            db.SaveChanges();
                        }
                    }
                }
            }
        return RedirectToAction("../Billing/HolidayDateTable");
        }

查看

 @using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<br />
    @*<div class="editor-label">
        @Html.LabelFor(model => model.HID)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.HID)
        @Html.ValidationMessageFor(model => model.HID)
    </div>
      *@
@Html.HiddenFor(model => model.HID)
    <div class="editor-label">
        @Html.LabelFor(model => model.TABLE_NUMBER)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.TABLE_NUMBER)
        @Html.ValidationMessageFor(model => model.TABLE_NUMBER)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.HOLIDAY_DATE)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.HOLIDAY_DATE)
        @Html.ValidationMessageFor(model => model.HOLIDAY_DATE)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.FIELD_DESCRIPTION)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.FIELD_DESCRIPTION)
        @Html.ValidationMessageFor(model => model.FIELD_DESCRIPTION)
    </div>
<br />
    <p>
        <input type="submit" value=" Update " />
    </p>

 }

或许可以澄清一些事情。我需要阻止ACTION_TYPE值为“ADD”的行更新为“CHANGE”。

更新：我设置了一个断点，发现somevar正在获取正确的id，而checkresult的值为“ADD”（带空格），所以我将if语句更改为

if (checkresult == "ADD ")

但是它仍然会将值从ADD更改为CHANGE。我迷路了。

C＃更新表未按预期更新

0 个答案: