[英]@HTML.Drop Down List and displaying databound information
我目前正在嘗試將一組缺少的SQL查詢報告發布到我的網頁上的下拉菜單中。
我相信我的模型是正確的,但是即使我的控制器具有適當的語法,它也無法識別任何列表作為@ HTML.DropDown的一部分,這存在一些問題。 因此,應用程序在呈現網頁之前崩潰。 我希望這是一個簡單的解決方法。
這是要調用的函數的控制器代碼:
public ActionResult FindDatMissingQuery()
{
HomeModel H = new HomeModel();
DropDownList ddl = new DropDownList();
ddl.DataSource = H.MissingQueryResults();
ddl.DataBind();
ViewData["MissingChem"] = ddl;
return View();
}
我的觀點
@using (Html.BeginForm("FindDatMissingQuery","Home")){
@Html.ValidationSummary(true)
<fieldset>
<legend>Missing Chemistry Report</legend>
<br />
@Html.DropDownList("MissingChemistryReports", ViewData["MissingChem"] as SelectList)
</fieldset>
}
我的模型功能:
public List<string> MissingQueryResults()
{
//HomeModel Tolerances = new HomeModel();
List<String> nameList = new List<String>();
SqlCommand missingQuery = new SqlCommand("SELECT heatname FROM dbo.chemistrytable WHERE heatname NOT IN (SELECT heatname FROM dbo.chemistrytable WHERE sampletype = 'AVE') AND analysistime bewteen Dateadd(day, -1, Current_Timestamp) and Current_Timestamp AND heatname LIKE '[a,b,c,d]%' Order by heatname'");// + heatName + "'");
SqlCommand mainquery = new SqlCommand("SELECT analysisvalue.analysisid, heatname, analysistime, sampletype, grade, productid, element, value FROM dbo.AnalysisValue INNER JOIN dbo.ChemistryAnalysis ON dbo.AnalysisValue.AnalysisID = dbo.ChemistryAnalysis.AnalysisID Where heatname = '" + heatName + "' Order By analysisvalue.analysisid Asc, element");
using (SqlConnection conn = new SqlConnection(strSQLconnection))
{
missingQuery.CommandTimeout = 20000;
conn.Open();
missingQuery.Connection = new SqlConnection(strSQLconnection);
missingQuery.Connection.Open();
using (var reader = missingQuery.ExecuteReader())
{
int fieldCount = reader.FieldCount;
while (reader.Read())
{
for (int i = 0; i < fieldCount; i++)
{
nameList.Add(reader[i].ToString().Trim());
}
}
}return nameList;
任何幫助將非常感激! 提前致謝。
這是我在示例中使用下拉列表的方式:
@Html.DropDownList("ActiveErrors", ListHelpers.PartsActive())
public static List<SelectListItem> PartsActive()
{
List<SelectListItem> list = new List<SelectListItem>();
list.Add(new SelectListItem { Text = "Yes", Value = "Y" });
list.Add(new SelectListItem { Text = "All", Value = "A" });
list.Add(new SelectListItem { Text = "No", Value = "N" });
return list;
}
或具有模型屬性
控制器:
ViewBag.RunTypeID = new SelectList(db.RunType, "ID", "RunTypeName").OrderBy(l => l.Text);
視圖:
<span class="rightContent">
@Html.DropDownList("RunTypeID", String.Empty)
</span>
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