当我点击编辑按钮时。下拉值未到，但The specified cast from a materialized 'System.Int64' type to the 'System.Int32' type is not valid.值存在，但未显示。它显示[Authorize]
[MyExceptionHandler]
public ActionResult EditModules(int id)
{
EditDomain_Bind();
userType type = new userType();
var ModID = type.GetEditRoleModulesViews(id).Find(Emp => Emp.ModuleID == id);
int domainID = ModID.DomainID;
AccountContext db = new AccountContext();
string selected = (from sub in db.domain
where sub.DomainID == domainID
select sub.DomainName).First();
ViewBag.DomainID = new SelectList(db.domain, "DomainID", "DomainName", selected);
return View(ModID);
}
控制器：
<div class="col-lg-4">
<fieldset class="form-group">
<label class="form-label" for="exampleInput">Domain Name</label>
@Html.DropDownList("DomainID")
@Html.ValidationMessageFor(model => Model.DomainID, null, new { @style = "color: red" })
</fieldset>
</div>
Cs.HTML：
public DbSet<Domain> domain { get; set; }
public class Domain
{
[Key]
public int DomainID { get; set; }
public string DomainName { get; set; }
}
型号：
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<start-class>io.pivotal.microservices.services.Main</start-class>
<spring-cloud.version>Brixton.RELEASE</spring-cloud.version>
</properties>
答案 0 :(得分：1)