如何解决ModelBinding引发错误没有为此对象定义无参数构造函数
public ActionResult GetData([FromBody] Employee emp)
{
}
public class Employee : Department
{
public string EmpName {get; set;}
public string EmpDetails {get; set;}
}
public class Department
{
public string DeptName {get; set;}
public TimeZoneInfo ClientTimeZoneInfo { get; set; }
}
当我通过下面的对象时，它的工作正常且端点已命中
{
"EmpName" : "Demo","EmpDetails" : "Test","DeptName" : "Cargo"
}
但是当我像下面那样传递我的objext时，抛出错误并且端点没有命中
{
"EmpName" : "Demo","DeptName" : "Cargo",}
当我单击UI上的按钮时，它将调用我的javaScript方法ReplyMesaage（Employee）和obj == Employee对象
replyMessage(obj) {
let that = this;
var token = $('input[name="__RequestVerificationToken"]').val();
// call to get the reply message partial view markup
$.ajax({
type: "POST",url: "/Messages/GetData",data: { __RequestVerificationToken: token,model: obj },success: function (data) {
$(window).scrollTop(0);
var panelbar = $("#Dump").data("kendoPanelBar");
panelbar.insertBefore({
text: "",encoded: false,content: data,expanded: true,collapse: function (e) {
if (e.item.class.contains('reply'))
e.preventDefault();
}
},panelbar.element.children("li:first"));
var isInternal = $("#test").val();
var message = $("#subject").val();
var TypeValue = $("#TypeValue").val();
that.loadRecipientList(isInternal,message,TypeValue);
}
});
例外：
没有为此对象定义无参数构造函数
有人可以帮我解决这个问题吗？
完全例外：
<!DOCTYPE html>
<html>
<head>
<title>No parameterless constructor defined for this object.</title>
<Meta name="viewport" content="width=device-width" />
<style>
body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
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b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
.marker {font-weight: bold; color: black;text-decoration: none;}
.version {color: gray;}
.error {margin-bottom: 10px;}
.expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:pointer; }
@media screen and (max-width: 639px) {
pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; }
}
@media screen and (max-width: 479px) {
pre { width: 280px; }
}
</style>
</head>
<body bgcolor="white">
<span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
<h2> <i>No parameterless constructor defined for this object.</i> </h2></span>
<font face="Arial,Helvetica,Geneva,SunSans-Regular,sans-serif ">
<b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
<br><br>
<b> Exception Details: </b>System.MissingMethodException: No parameterless constructor defined for this object.<br><br>
<b>Source Error:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code>
An unhandled exception was generated during the execution of the current web request. information regarding the origin and location of the exception can be identified using the exception stack trace below. </code>
</td>
</tr>
</table>
<br>
<b>Stack Trace:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code><pre>
[MissingMethodException: No parameterless constructor defined for this object.]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type,Boolean publicOnly,Boolean noCheck,Boolean& canBeCached,RuntimeMethodHandleInternal& ctor,Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly,Boolean skipCheckThis,Boolean fillCache,StackCrawlMark& stackMark) +122
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly,StackCrawlMark& stackMark) +239
System.Activator.CreateInstance(Type type,Boolean nonPublic) +85
System.Activator.CreateInstance(Type type) +12
System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext,ModelBindingContext bindingContext,Type modelType) +197
[MissingMethodException: No parameterless constructor defined for this object. Object type 'System.TimeZoneInfo'.]
System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext,Type modelType) +233
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext,ModelBindingContext bindingContext) +511
System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext,ModelBindingContext bindingContext) +333
System.Web.Mvc.DefaultModelBinder.GetPropertyValue(ControllerContext controllerContext,PropertyDescriptor propertyDescriptor,IModelBinder propertyBinder) +17
System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext,PropertyDescriptor propertyDescriptor) +377
System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext,ModelBindingContext bindingContext) +101
System.Web.Mvc.DefaultModelBinder.BindComplexElementalModel(ControllerContext controllerContext,Object model) +55
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext,ModelBindingContext bindingContext) +1207
System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext,ModelBindingContext bindingContext) +333
System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext,ParameterDescriptor parameterDescriptor) +335
System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext,ActionDescriptor actionDescriptor) +105
System.Web.Mvc.Async.<>c__displayClass3_1.<BeginInvokeAction>b__0(AsyncCallback asyncCallback,Object asyncState) +640
System.Web.Mvc.Async.WrappedAsyncResult`1.CallBeginDelegate(AsyncCallback callback,Object callbackState) +14
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback,Object state,Int32 timeout) +128
System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext,String actionName,AsyncCallback callback,Object state) +346
System.Web.Mvc.<>c.<BeginExecuteCore>b__152_0(AsyncCallback asyncCallback,Object asyncState,ExecuteCoreState innerState) +27
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback,Object callbackState) +30
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback,Int32 timeout) +128
System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback,Object state) +494
System.Web.Mvc.<>c.<BeginExecute>b__151_1(AsyncCallback asyncCallback,Object callbackState,Controller controller) +16
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback,Object callbackState) +20
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback,Int32 timeout) +128
System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext,Object state) +403
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext,Object state) +16
System.Web.Mvc.<>c.<BeginProcessRequest>b__20_0(AsyncCallback asyncCallback,ProcessRequestState innerState) +54
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback,Int32 timeout) +128
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext,Object state) +412
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext,Object state) +48
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context,AsyncCallback cb,Object exTradata) +16
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +444
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +118
System.Web.HttpApplication.ExecuteStep(IExecutionStep step,Boolean& completedSynchronously) +163
</pre> </code>
</td>
</tr>
</table>
<br>
<hr width=100% size=1 color=silver>
<b>Version information:</b> Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4210.0
</font>
</body>
</html>
<!--
[MissingMethodException]: No parameterless constructor defined for this object.
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type,Boolean& canBeCached,RuntimeMethodHandleInternal& ctor,Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly,StackCrawlMark& stackMark)
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly,StackCrawlMark& stackMark)
at System.Activator.CreateInstance(Type type,Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext,Type modelType)
[MissingMethodException]: No parameterless constructor defined for this object. Object type 'System.TimeZoneInfo'.
at System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext,Type modelType)
at System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext,ModelBindingContext bindingContext)
at System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext,ModelBindingContext bindingContext)
at System.Web.Mvc.DefaultModelBinder.GetPropertyValue(ControllerContext controllerContext,IModelBinder propertyBinder)
at System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext,PropertyDescriptor propertyDescriptor)
at System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext,ModelBindingConte…
解决方法
您有两个主要选择：
-
创建包含EmpName，EmpDetails和DepName属性的新类EmpDept 并将您的操作更改为GetData（[FromBody] EmpDept empDept）
-
只需将您的操作更改为GetData（[FromBody]字符串EmpName，字符串EmpDetails，字符串DepName = null），然后在操作主体中使用此参数创建新类
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