我有一个 issuedate
的下拉列表这些日期填写了我的下拉列表,在http get方法中应用了一些过滤器
ViewBag.PMID1 = new SelectList(db.PRIMKT_MAST.Where(z => z.PRODUCT_ID == j && z.REC_VERIFIED == 0 && z.VERIFY_LOCK == 0 && z.TRTYPE == i), "PMID", "ISSUE_DATE");
这是我的下拉列表 .
@ Html.LabelFor(model => model.ISSUE_DATE,new {@class = "control-label col-md-2"})@ Html.DropDownList("PMID1",null,new {@onchange = "FillTenor()"})@ Html.ValidationMessageFor(model => model.ISSUE_DATE)
现在我想在一个表格中选择 AUCTIONID
,这个下拉列表根据发行日期填写如 select auctionid where issuedate = dropdown selected value
当我们得到 auctionid
我想拿这个 auctionid
并在其他表中搜索并在此基础上填充另一个下拉列表 auctionid
如 select Tenors(i want to select this value) where auctionid is (whatever we get from dropdown)
这是我要填写的第二个Dropdownt列表
<div class="form-group">
@Html.LabelFor(model => model.TENOR_ID, "TENOR_ID", new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownListFor(m => m.TENOR_ID,
new SelectList(Enumerable.Empty<SelectListItem>(), "AUCDT_ID", "TENOR_ID"),
"Select Tenors",
new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.BRANCH_ID)
</div>
</div>
This is my Controller
public ActionResult Create()
{
ViewBag.AUCTION_ID = new SelectList(db.AUCTION_DATA, "AUCTION_ID", "PRODUCT_ID");
ViewBag.CUSTOMER_ID = new SelectList(db.CUSTOMERs, "CUSTOMER_ID", "CUSTOMER_NAME");
ViewBag.PMID = new SelectList(db.PRIMKT_MAST, "PMID", "PRODUCT_ID");
ViewBag.BRANCH_ID = new SelectList(db.BRANCHes, "BRANCH_ID", "BRANCH_DESC");
//ViewData["ListofIssueDate"] = db.PRIMKT_MAST.Where(z => z.PRODUCT_ID == Session["Product_Id"] && z.REC_VERIFIED == 0 && z.VERIFY_LOCK == 0 && z.TRTYPE == Convert.ToInt32(Session["Trtype"])).Select(z => z.ISSUE_DATE);
int i = Convert.ToInt32(Session["Trtype"]);
string j =Convert.ToString( Session["Product_Id"]);
ViewBag.PMID1 = new SelectList(db.PRIMKT_MAST.Where(z => z.PRODUCT_ID == j && z.REC_VERIFIED == 0 && z.VERIFY_LOCK == 0 && z.TRTYPE == i), "ISSUE_DATE", "ISSUE_DATE");
return View();
}
我的Ajax电话..
@section script {
<script>
function FillTenor() {
var IssueDate = $('#PMID1').val();
$.ajax({
url: '@Url.Action("FillCity", "PrimaryMarket")',
type: "GET",
dataType: "JSON",
data: { IssueDate: $("#PMID1").val() },
success: function (Tenor) {
$("#TENOR_ID").html(""); // clear before appending new list
$.each(Tenor, function (i, AUCDATA_TENORS) {
$("#TENOR_ID").append(
$('<option></option>').val(AUCDATA_TENORS.AUCDT_ID).html(AUCDATA_TENORS.TENOR_ID));
});
}
});
}
</script>
}
My onchange Method
[HttpGet]
public ActionResult FillTenor(DateTime? IssueDate)
{
var auctionid = db.PRIMKT_MAST.Where(c => c.ISSUE_DATE == IssueDate).Select(c=>c.AUCTION_ID).ToList();
var Tenor = db.AUCDATA_TENORS.Where(c => c.AUCTION_ID ==( auctionid[0])).Select(c => c.TENOR_ID);
return Json(Tenor, JsonRequestBehavior.AllowGet);
}
1 回答
乍一看,带有
get_Item(Int32)
的LINQ to Entities does not recognize the method
意味着您在lambda表达式中具有某些可能返回null或空值的数组值,因此无法将其转换为正确的SQL语句来填充您的级联下拉列表 .我怀疑这个表达式产生了异常:
建议的lambda表达式:
注意:此行为也适用于包含属性的类中的数组 .
欢迎任何改进和建议 .
参考:LINQ to Entities does not recognize the method ... get_Item(Int32)