C# 运行时异常

这是我得到的例外：

参数字典包含“AuthSys.Controllers.MemberController”中方法“System.Web.Mvc.ActionResult AddMemberSystem.String、System.String、System.DateTime、Int32、System.String”的非空类型“System.DateTime”的参数“birthDate”的空条目。可选参数必须是引用类型、可为null的类型或声明为可选参数。 参数AVN：参数

我的观点是这样的：

以及viewmodel

当我尝试运行我的应用程序时会出现错误。通过互联网搜索这个错误，他们都指向路由，这让我更加困惑。我不完全理解错误消息。看起来它说Date是空值，但在视图中，用户将提供Date参数。谁能解释一下我的问题是什么？非常感谢

如果需要，我的路线如下所示：

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Member", action = "AddMember", id = UrlParameter.Optional }
);

-----------更新------------

对不起，我不认为视图的完整代码是必需的。这是完整的代码

    @model AuthSys.ViewModels.MemberViewModel

@{
    ViewBag.Title = "Medlem";
}

<h2>Member</h2>

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <div class="imageComponent">
            <div class="memberPhoto">
                <p>Billed mangler</p>
                <br />
            </div>
            <input type="button" value="Tag et billed" style="float:right; margin-right: 20px;" />
        </div>
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">                
                <br />
                @Html.LabelFor(model => model.FirstName)
                @Html.TextBoxFor(model => model.FirstName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.LastName)
                @Html.TextBoxFor(model => model.LastName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.BirthDate)
                @Html.TextBoxFor(model => model.BirthDate, new { size = "50", @type = "date", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.Age)
                @Html.TextBoxFor(model => model.Age, new { maxlength = "3", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.SportType)
                @Html.TextBoxFor(model => model.SportType, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                <input type="submit" value="Opret" class="btn btn-default" />
            </div>            
        </div>
    </div>
}

<div>
    @Html.ActionLink("Registrerede medlemmer", "RegisteredMembers")    
</div>

---

您的代码似乎没有包装在表单中。因此，在提交请求时，不会对参数进行表单绑定

解决方案-将代码包装到表单中。请参阅下面的代码

@using (Html.BeginForm("AddMember", "<<ControllerName>>", new { }, FormMethod.Post))
{
    <div class="col-md-offset-2 col-md-10">                
                <br />
                @Html.LabelFor(model => model.FirstName)
                @Html.TextBoxFor(model => model.FirstName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.LastName)
                @Html.TextBoxFor(model => model.LastName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.BirthDate)
                @Html.TextBoxFor(model => model.BirthDate, new { size = "50", @type = "date", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.Age)
                @Html.TextBoxFor(model => model.Age, new { maxlength = "3", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.SportType)
                @Html.TextBoxFor(model => model.SportType, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                <input type="submit" value="Opret" class="btn btn-default" />
            </div> 
}

---

从您调用addmember函数的地方可以看出代码或htmlhat将来自视图。我在topCan上提供的第一个代码请将代码包装在form HTML属性中。您可以使用@Html.begin将完整的Html与表单标记一起共享。在这篇文章中有几个很好的答案。我觉得问题出在视图代码中，一个空值被传递到控制器操作中。您可以通过将操作中的参数设置为null并检查值是否为null来检查这一点。

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Member", action = "AddMember", id = UrlParameter.Optional }
);

    @model AuthSys.ViewModels.MemberViewModel

@{
    ViewBag.Title = "Medlem";
}

<h2>Member</h2>

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <div class="imageComponent">
            <div class="memberPhoto">
                <p>Billed mangler</p>
                <br />
            </div>
            <input type="button" value="Tag et billed" style="float:right; margin-right: 20px;" />
        </div>
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">                
                <br />
                @Html.LabelFor(model => model.FirstName)
                @Html.TextBoxFor(model => model.FirstName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.LastName)
                @Html.TextBoxFor(model => model.LastName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.BirthDate)
                @Html.TextBoxFor(model => model.BirthDate, new { size = "50", @type = "date", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.Age)
                @Html.TextBoxFor(model => model.Age, new { maxlength = "3", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.SportType)
                @Html.TextBoxFor(model => model.SportType, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                <input type="submit" value="Opret" class="btn btn-default" />
            </div>            
        </div>
    </div>
}

<div>
    @Html.ActionLink("Registrerede medlemmer", "RegisteredMembers")    
</div>

@using (Html.BeginForm("AddMember", "<<ControllerName>>", new { }, FormMethod.Post))
{
    <div class="col-md-offset-2 col-md-10">                
                <br />
                @Html.LabelFor(model => model.FirstName)
                @Html.TextBoxFor(model => model.FirstName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.LastName)
                @Html.TextBoxFor(model => model.LastName, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.BirthDate)
                @Html.TextBoxFor(model => model.BirthDate, new { size = "50", @type = "date", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.Age)
                @Html.TextBoxFor(model => model.Age, new { maxlength = "3", size = "50", @class = "AddMemberControls" })
                <br /><br />
                @Html.LabelFor(model => model.SportType)
                @Html.TextBoxFor(model => model.SportType, new { maxlength = "50", size = "50", @class = "AddMemberControls" })
                <br /><br />
                <input type="submit" value="Opret" class="btn btn-default" />
            </div> 
}