Question

我在asp.net mvc应用程序中有以下视图： -

 @model MvcApplication4.Models.ContactsDetails
     <h3>Select Contacts Detials</h3>
    <p class="dashboarder" style = "color:#5c87b2"><strong>@Model.Info.Count()</strong> Selected Customers Accounts.</p>
    @using (Html.BeginForm("Export", null))
    {
        Int32 c = -1;
        <table>
            <tr>
                <th>
                    Account Name @Html.CheckBox("IncludeAccountName", true)
                </th>
                <th>
                    Name @Html.CheckBox("IncludeName", true)
                </th>

使用以下操作方法填充： -

public ActionResult CustomersDetails(long[] SelectRight)
{

    if (SelectRight == null)
    {
        return RedirectToAction("customer", new { isError = true });
    }
    else
    {

        var ContactsDetails2 = new ContactsDetails
        {
            Info = r.getcontactinfo(SelectRight)
        };
        return View(ContactsDetails2);

    }          


}

然后是以下存储库方法： -

public IEnumerable<AaaUserContactInfo> getcontactinfo(long[] id)
{
    var organizationNames = entities.SDOrganizations
                   .Where(org => id.Contains(org.ORG_ID))
                   .Select(org => org.NAME);


    var result = from userContactInfo in entities.AaaUserContactInfoes
                 join contactInfo in entities.AaaContactInfoes on userContactInfo.CONTACTINFO_ID equals contactInfo.CONTACTINFO_ID
                 where organizationNames.Contains(contactInfo.EMAILID.ToString())
                 select userContactInfo;
    return result;

但是当我运行mu应用程序时，我在视图中得到了一个不明确的错误： -

LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression.

以下代码： -

<strong>@Model.Info.Count()</strong>

Answer 1

使用SqlFunctions.StringConvert方法代替ToString（无法转换为SQL）：

where organizationNames.Contains(SqlFunctions.StringConvert(contactInfo.EMAILID))

如果EMAILID不是double或decimal，那么只需将值转换为其中一种类型。

LINQ to Entities无法识别方法'System.String ToString（）'方法，并且此方法无法转换为存储表达式

1 个答案: