C# InvalidOperationException：尝试将映像传递给MVC中的控制器时，无法创建抽象类的实例

我正在尝试在我的数据库中保存图像，我正在使用ASP.NET MVC。 在添加图像属性之前，我有一个收集数据的表单，所有的表单都正常工作

这是我的视图代码：

<div id="createMemberModel" class="modal">
    <div class="modal-content" style="width:40%">
        <form asp-antiforgery="true" asp-action="Create" method="post">
            <div class="panel panel-default">
                <div class="panel-heading">
                    <span class="panel-title">
                        Create new member
                    </span>
                    <span class="close glyphicon glyphicon-remove-sign"></span>
                </div>
                <div class="panel-body">
                    <div asp-validation-summary="All" class="text-danger"></div>
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <labe class="control-label col-md-4">Title:</labe>
                            <div class="col-md-8">
                                <select name="Title" class="form-control" required>
                                    <option>Mr</option>
                                    <option>Mrs</option>
                                    <option>Ms</option>
                                    <option>Mx</option>
                                    <option>Miss</option>
                                    <optgroup label="Legislative and executive">
                                        <option>Representative</option>
                                        <option>Senator</option>
                                        <option>Speaker</option>
                                        <option>President</option>
                                        <option>Councillor</option>
                                        <option>Delegate</option>
                                        <option>Mayor</option>
                                        <option>Governor </option>
                                        <option>Secretary</option>
                                    </optgroup>
                                </select>
                            </div>
                        </div>
                    </div>
                    <br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <label class="control-label col-md-4">First Name:</label>
                            <div class="col-md-8">
                                <input name="FirstName" class="form-control" required />
                            </div>
                        </div>
                    </div>
                    <br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <label class="control-label col-md-4">Last Name:</label>
                            <div class="col-md-8">
                                <input name="LastName" class="form-control" required />
                            </div>
                        </div>
                    </div>
                    <br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <label class="control-label col-md-4">Phone Number:</label>
                            <div class="col-md-8">
                                <input name="Phone" class="form-control" required />
                            </div>
                        </div>
                    </div>
                    <br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <label class="control-label col-md-4">Party:</label>
                            <div class="col-md-8">
                                <input name="Party" class="form-control" required />
                            </div>
                        </div>
                    </div>
                    <br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <label class="control-label col-md-4">Email Address:</label>
                            <div class="col-md-8">
                                <input name="Email" class="form-control" required />
                            </div>
                        </div>
                    </div>
                    <br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group">
                            <label class="control-label col-md-4">Browse: </label>
                            <div class="col-md-8">
                                <input class="form-control" id="image" name="image" type="file" hidden>
                            </div>
                        </div>
                    </div>
                    <br /><br /><br />
                    <div class="form-horizontal">
                        <div class="panel-group pull-right">
                            <div class="col-md-1">
                                <input type="submit" value="Create" class="btn btn-default" />
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </form>
    </div>
</div>

我完全明白，但我不明白是什么导致了这个问题

我的第一个想法是，这与我使用的Automapper有关。我在想，绑定可能不好，或者类似的东西，但在模型中添加绑定后，我仍然有相同的绑定

问题发生在我单击“创建”按钮的同一秒，它从未触及后端代码制动点。所以我想我在这个观点上遗漏了什么

如果这意味着什么，这些是原始异常详细信息：

System.InvalidOperationException: Instances of abstract classes cannot be created.
   at System.Runtime.CompilerServices.RuntimeHelpers._CompileMethod(IRuntimeMethodInfo method)
   at System.Reflection.Emit.DynamicMethod.CreateDelegate(Type delegateType, Object target)
   at System.Linq.Expressions.Compiler.LambdaCompiler.CreateDelegate()
   at System.Linq.Expressions.Compiler.LambdaCompiler.Compile(LambdaExpression lambda, DebugInfoGenerator debugInfoGenerator)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel(ModelBindingContext bindingContext)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.<BindModelCoreAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.DefaultControllerArgumentBinder.<BindModelAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.DefaultControllerArgumentBinder.<BindArgumentsCoreAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAllActionFiltersAsync>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeExceptionFilterAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.ApplicationInsights.AspNetCore.ExceptionTrackingMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Web.BrowserLink.Runtime.BrowserLinkMiddleware.<ExecuteWithFilter>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__6.MoveNext()

System.InvalidOperationException:无法创建抽象类的实例。
在System.Runtime.CompilerServices.RuntimeHelpers.\u CompileMethod（IRuntimeMethodInfo方法）
位于System.Reflection.Emit.DynamicMethod.CreateDelegate（类型delegateType，对象目标）
在System.Linq.Expressions.Compiler.LambdaCompiler.CreateDelegate（）中
位于System.Linq.Expressions.Compiler.LambdaCompiler.Compile（LambdaExpression lambda，DebugInfoGenerator DebugInfoGenerator）
位于Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel（ModelBindingContext绑定上下文）
在Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.d_u4.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Mvc.Internal.DefaultControllerArgumentBinder.d_u8.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Mvc.Internal.DefaultControllerArgumentBinder.d_u6.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u26.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u25.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u18.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Builder.RouterMiddleware.d_u4.MoveNext（）上
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.d_u18.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.d_u18.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.d_u18.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.d_u18.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.ApplicationInsights.AspNetCore.ExceptionTrackingMiddleware.d_u4.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.VisualStudio.Web.BrowserLink.Runtime.BrowserLinkMiddleware.d_u7.MoveNext（）上
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.d_u6.MoveNext（）上

这是我的模型：

public class CreateMemberViewModel : IMapFrom<MemberEntity>, IMapTo<MemberEntity>, IHaveCustomMappings
{
    public int Id { get; set; }

    public string Title { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public bool IsActive { get; set; }

    public string Email { get; set; }

    public string Phone { get; set; }

    public string Party { get; set; }

    public byte[] Image { get; set; }

    public string FullName { get { return $"{Title} {FirstName} {LastName}"; } }

    public void CreateMappings(IMapperConfigurationExpression configuration)
    {
        configuration.CreateMap<CreateMemberViewModel, MemberEntity>()
            .ForMember(t => t.Image, opt => opt.ResolveUsing(t => t.Image == null ? null : t.Image));
    }
}

public类CreateMemberViewModel:IMapFrom、IMapTo、IHaveCustomMappings
{
公共int Id{get；set；}
公共字符串标题{get；set；}
公共字符串名{get；set；}
公共字符串LastName{get；set；}
公共bool IsActive{get；set；}
公共字符串电子邮件{get；set；}
公用字符串电话{get；set；}
公共字符串参与方{get；set；}
公共字节[]映像{get；set；}
公共字符串全名{get{return$“{Title}{FirstName}{LastName}”；}
公共无效信用证
System.InvalidOperationException: Instances of abstract classes cannot be created.
   at System.Runtime.CompilerServices.RuntimeHelpers._CompileMethod(IRuntimeMethodInfo method)
   at System.Reflection.Emit.DynamicMethod.CreateDelegate(Type delegateType, Object target)
   at System.Linq.Expressions.Compiler.LambdaCompiler.CreateDelegate()
   at System.Linq.Expressions.Compiler.LambdaCompiler.Compile(LambdaExpression lambda, DebugInfoGenerator debugInfoGenerator)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel(ModelBindingContext bindingContext)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.<BindModelCoreAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.DefaultControllerArgumentBinder.<BindModelAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.DefaultControllerArgumentBinder.<BindArgumentsCoreAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAllActionFiltersAsync>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeExceptionFilterAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.ApplicationInsights.AspNetCore.ExceptionTrackingMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Web.BrowserLink.Runtime.BrowserLinkMiddleware.<ExecuteWithFilter>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__6.MoveNext()

public class CreateMemberViewModel : IMapFrom<MemberEntity>, IMapTo<MemberEntity>, IHaveCustomMappings
{
    public int Id { get; set; }

    public string Title { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public bool IsActive { get; set; }

    public string Email { get; set; }

    public string Phone { get; set; }

    public string Party { get; set; }

    public byte[] Image { get; set; }

    public string FullName { get { return $"{Title} {FirstName} {LastName}"; } }

    public void CreateMappings(IMapperConfigurationExpression configuration)
    {
        configuration.CreateMap<CreateMemberViewModel, MemberEntity>()
            .ForMember(t => t.Image, opt => opt.ResolveUsing(t => t.Image == null ? null : t.Image));
    }
}